http://emdrive.echothis.com/index.php?action=history&feed=atom&title=Evanescent_wavesEvanescent waves - Revision history2026-09-12T11:25:46ZRevision history for this page on the wikiMediaWiki 1.41.1http://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=1215&oldid=prevFlux capacitor: Link to Zneg and Fan paper2015-08-09T21:02:15Z<p>Link to Zneg and Fan paper</p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* "Electromagnetic fields and transmission properties in tapered hollow metallic waveguides" by Xiahui Zeng and Dianyuan Fan. Optics Express Vol. 17, Issue 1, pp. 34-45 (2009) •doi: 10.1364/OE.17.<del style="font-weight: bold; text-decoration: none;">0</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* <ins style="font-weight: bold; text-decoration: none;">[https://www.osapublishing.org/view_article.cfm?gotourl=https%3A%2F%2Fwww%2Eosapublishing%2Eorg%2FDirectPDFAccess%2FCAAD3BE7%2DB96D%2D5276%2D041FDBDB0A54A3B5%5F175583%2Foe%2D17%2D1%2D34%2Epdf%3Fda%3D1%26id%3D175583%26seq%3D0%26mobile%3Dno&org= </ins>"Electromagnetic fields and transmission properties in tapered hollow metallic waveguides"<ins style="font-weight: bold; text-decoration: none;">] </ins>by Xiahui Zeng and Dianyuan Fan. Optics Express Vol. 17, Issue 1, pp. 34-45 (2009) •doi: 10.1364/OE.17.<ins style="font-weight: bold; text-decoration: none;">000034</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [http://arxiv.org/pdf/1308.0547.pdf "Extraordinary momentum and spin in evanescent waves"] by Konstantin Y. Bliokh, Aleksandr Y. Bekshaev, and Franco Nori - See Supplementary Table 1.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* [http://arxiv.org/pdf/1308.0547.pdf "Extraordinary momentum and spin in evanescent waves"] by Konstantin Y. Bliokh, Aleksandr Y. Bekshaev, and Franco Nori - See Supplementary Table 1.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* https://en.wikipedia.org/wiki/Mie_scattering</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* https://en.wikipedia.org/wiki/Mie_scattering</div></td></tr>
</table>Flux capacitorhttp://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=484&oldid=prev127.0.0.1 at 22:19, 1 June 20152015-06-01T22:19:38Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:19, 1 June 2015</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Later Desiato (@WarpTech) and Rodal proposed at the NSF forum that the EmDrive's tapered conical design causes a gradient in the electromagnetic field such that travelling waves (from the RF source) propagating towards the small end of the truncated cone are attenuated by the tapering geometry, producing evanescent waves that carry momentum. The EM Drive must then accelerate to satisfy conservation of momentum. The standing waves inside the EM Drive (responsible for the high Q resonance) are comprised of travelling waves propagating in opposite directions. (How the evanescent waves travelling toward the small end may benefit from the stored energy density from the standing waves remains to be analyzed.) <ref>[http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382031#msg1382031 Forum post by Rodal]</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Later Desiato (@WarpTech) and Rodal proposed at the NSF forum that the EmDrive's tapered conical design causes a gradient in the electromagnetic field such that travelling waves (from the RF source) propagating towards the small end of the truncated cone are attenuated by the tapering geometry, producing evanescent waves that carry momentum. The EM Drive must then accelerate to satisfy conservation of momentum. The standing waves inside the EM Drive (responsible for the high Q resonance) are comprised of travelling waves propagating in opposite directions. (How the evanescent waves travelling toward the small end may benefit from the <ins style="font-weight: bold; text-decoration: none;">high Q </ins>stored energy density from the standing waves remains to be analyzed.) <ref>[http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382031#msg1382031 Forum post by Rodal]</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Status ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Status ==</div></td></tr>
</table>127.0.0.1http://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=483&oldid=prev127.0.0.1 at 22:18, 1 June 20152015-06-01T22:18:34Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Later <del style="font-weight: bold; text-decoration: none;">Rodal and Todd </del>@WarpTech proposed at the NSF forum that the EmDrive's tapered conical design causes a gradient in the electromagnetic field such that travelling waves (from the RF source) propagating towards the small end of the truncated cone are attenuated by the tapering geometry, producing evanescent waves that carry momentum. The EM Drive must then accelerate to satisfy conservation of momentum. The standing waves inside the EM Drive (responsible for the high Q resonance) are comprised of travelling waves propagating in opposite directions. (How the evanescent waves travelling toward the small end may benefit from the stored energy density from the standing waves remains to be analyzed.) <ref>[http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382031#msg1382031 Forum post by Rodal]</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Later <ins style="font-weight: bold; text-decoration: none;">Desiato (</ins>@WarpTech<ins style="font-weight: bold; text-decoration: none;">) and Rodal </ins>proposed at the NSF forum that the EmDrive's tapered conical design causes a gradient in the electromagnetic field such that travelling waves (from the RF source) propagating towards the small end of the truncated cone are attenuated by the tapering geometry, producing evanescent waves that carry momentum. The EM Drive must then accelerate to satisfy conservation of momentum. The standing waves inside the EM Drive (responsible for the high Q resonance) are comprised of travelling waves propagating in opposite directions. (How the evanescent waves travelling toward the small end may benefit from the stored energy density from the standing waves remains to be analyzed.) <ref>[http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382031#msg1382031 Forum post by Rodal]</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Status ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Status ==</div></td></tr>
</table>127.0.0.1http://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=482&oldid=prev127.0.0.1 at 22:16, 1 June 20152015-06-01T22:16:48Z<p></p>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Two evanescent wave theories have been proposed at NSF:</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Two <ins style="font-weight: bold; text-decoration: none;">different </ins>evanescent wave theories have been proposed at NSF<ins style="font-weight: bold; text-decoration: none;">, one for evanescent waves leaking to the exterior of the EM Drive and one for evanescent waves strictly confined to its interior</ins>:</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td></tr>
</table>127.0.0.1http://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=481&oldid=prev127.0.0.1 at 22:15, 1 June 20152015-06-01T22:15:03Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Numerical Analysis==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Numerical Analysis==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>@Aero performed calculations for evanescent waves leaking from the EM Drive and producing an external near-field. He used a two-dimensional MEEP Finite Difference model that modeled the EM Drive truncated cone as a flat trapezium. Maxwell's equations were solved in the 2-D domain, thus the transverse electromagnetic vector could only be represented as a scalar. The 2-D model was due to the enormous amount of memory and computer time required by the Finite Difference method, which made a 3-D model in a home PC impractical. The results from the 2-D analysis showed a thrust force/input-power multiple of 2-3 times that of a perfectly collimated photon drive, which is beneath the reported measurements of EM Drive by NASA Eagleworks, Shawyer's SPR and Prof. Juan Yang's team at NWPU.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1313876#msg1313876 Initial calculations by aero.]</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>@Aero performed calculations for evanescent waves leaking from the EM Drive and producing an external near-field. He used a two-dimensional MEEP Finite Difference model that modeled the EM Drive truncated cone as a flat trapezium. Maxwell's equations were solved in the 2-D domain, thus the transverse electromagnetic vector could only be represented as a scalar. The 2-D model was due to the enormous amount of memory and computer time required by the Finite Difference method, which made a 3-D model in a home PC impractical. The results from the 2-D analysis showed a thrust force/input-power multiple of 2-3 times that of a perfectly collimated photon drive, which is <ins style="font-weight: bold; text-decoration: none;">significantly </ins>beneath the reported measurements of EM Drive by NASA Eagleworks, Shawyer's SPR and Prof. Juan Yang's team at NWPU.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1313876#msg1313876 Initial calculations by aero.]</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Utilizing [http://ab-initio.mit.edu/wiki/index.php/Meep MEEP] 2-D model, the conclusion was that due to rapid dropoff at the frustum surface, evanescent waves were of insufficient magnitude to explain the observed thrust.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1330521#msg1330521 this post by @aero on modeled evanescent waves]</ref>. See details about @aero's [http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382078#msg1382078 MEEP control file].</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Utilizing [http://ab-initio.mit.edu/wiki/index.php/Meep MEEP] 2-D model, the conclusion was that due to rapid dropoff at the frustum surface, evanescent waves were of insufficient magnitude to explain the observed thrust.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1330521#msg1330521 this post by @aero on modeled evanescent waves]</ref>. See details about @aero's [http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382078#msg1382078 MEEP control file].</div></td></tr>
</table>127.0.0.1http://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=480&oldid=prev127.0.0.1 at 22:14, 1 June 20152015-06-01T22:14:25Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Numerical Analysis==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Numerical Analysis==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>@Aero performed calculations for evanescent waves leaking from the EM Drive and producing an external near-field. He used a two-dimensional MEEP Finite Difference model that modeled the EM Drive truncated cone as a flat trapezium. Maxwell's equations were solved in the 2-D domain, thus the transverse electromagnetic vector could only be represented as a scalar. The 2-D model was due to the enormous amount of memory and computer time required by the Finite Difference method, which made a 3-D model in a home PC impractical. The results from the 2-D analysis showed <del style="font-weight: bold; text-decoration: none;">an efficiency rating </del>2-3 times that of a perfectly collimated photon drive, which is beneath the reported measurements of EM Drive by NASA Eagleworks, Shawyer's SPR and Prof. Juan Yang's team at NWPU.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1313876#msg1313876 Initial calculations by aero.]</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>@Aero performed calculations for evanescent waves leaking from the EM Drive and producing an external near-field. He used a two-dimensional MEEP Finite Difference model that modeled the EM Drive truncated cone as a flat trapezium. Maxwell's equations were solved in the 2-D domain, thus the transverse electromagnetic vector could only be represented as a scalar. The 2-D model was due to the enormous amount of memory and computer time required by the Finite Difference method, which made a 3-D model in a home PC impractical. The results from the 2-D analysis showed <ins style="font-weight: bold; text-decoration: none;">a thrust force/input-power multiple of </ins>2-3 times that of a perfectly collimated photon drive, which is beneath the reported measurements of EM Drive by NASA Eagleworks, Shawyer's SPR and Prof. Juan Yang's team at NWPU.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1313876#msg1313876 Initial calculations by aero.]</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Utilizing [http://ab-initio.mit.edu/wiki/index.php/Meep MEEP] 2-D model, the conclusion was that due to rapid dropoff at the frustum surface, evanescent waves were of insufficient magnitude to explain the observed thrust.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1330521#msg1330521 this post by @aero on modeled evanescent waves]</ref>. See details about @aero's [http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382078#msg1382078 MEEP control file].</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Utilizing [http://ab-initio.mit.edu/wiki/index.php/Meep MEEP] 2-D model, the conclusion was that due to rapid dropoff at the frustum surface, evanescent waves were of insufficient magnitude to explain the observed thrust.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1330521#msg1330521 this post by @aero on modeled evanescent waves]</ref>. See details about @aero's [http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382078#msg1382078 MEEP control file].</div></td></tr>
</table>127.0.0.1http://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=479&oldid=prev127.0.0.1 at 22:13, 1 June 20152015-06-01T22:13:07Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:13, 1 June 2015</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Numerical Analysis==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Numerical Analysis==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>@Aero performed calculations for evanescent waves leaking from the EM Drive and producing an external near-field. He used a two-dimensional MEEP Finite Difference model that modeled the EM Drive truncated cone as a flat trapezium. Maxwell's equations were solved in the 2-D domain, thus the transverse electromagnetic vector could only be represented as a scalar. The 2-D model was due to the enormous amount of memory and computer time required by the Finite Difference method, which made a 3-D model in a home PC <del style="font-weight: bold; text-decoration: none;">not practical</del>. The results from the 2-D analysis showed an efficiency rating 2-3 times that of a perfectly collimated photon drive, which is beneath the reported measurements of EM Drive by NASA Eagleworks, Shawyer's SPR and Prof. Juan Yang's team at NWPU.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1313876#msg1313876 Initial calculations by aero.]</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>@Aero performed calculations for evanescent waves leaking from the EM Drive and producing an external near-field. He used a two-dimensional MEEP Finite Difference model that modeled the EM Drive truncated cone as a flat trapezium. Maxwell's equations were solved in the 2-D domain, thus the transverse electromagnetic vector could only be represented as a scalar. The 2-D model was due to the enormous amount of memory and computer time required by the Finite Difference method, which made a 3-D model in a home PC <ins style="font-weight: bold; text-decoration: none;">impractical</ins>. The results from the 2-D analysis showed an efficiency rating 2-3 times that of a perfectly collimated photon drive, which is beneath the reported measurements of EM Drive by NASA Eagleworks, Shawyer's SPR and Prof. Juan Yang's team at NWPU.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1313876#msg1313876 Initial calculations by aero.]</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Utilizing [http://ab-initio.mit.edu/wiki/index.php/Meep MEEP] 2-D model, the conclusion was that due to rapid dropoff at the frustum surface, evanescent waves were of insufficient magnitude to explain the observed thrust.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1330521#msg1330521 this post by @aero on modeled evanescent waves]</ref>. See details about @aero's [http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382078#msg1382078 MEEP control file].</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Utilizing [http://ab-initio.mit.edu/wiki/index.php/Meep MEEP] 2-D model, the conclusion was that due to rapid dropoff at the frustum surface, evanescent waves were of insufficient magnitude to explain the observed thrust.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1330521#msg1330521 this post by @aero on modeled evanescent waves]</ref>. See details about @aero's [http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382078#msg1382078 MEEP control file].</div></td></tr>
</table>127.0.0.1http://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=478&oldid=prev127.0.0.1 at 22:12, 1 June 20152015-06-01T22:12:21Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:12, 1 June 2015</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Numerical Analysis==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Numerical Analysis==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>@Aero performed calculations for evanescent waves leaking from the EM Drive and producing an external near-field. He used a two-dimensional MEEP Finite Difference model that modeled the EM Drive as a <del style="font-weight: bold; text-decoration: none;">perfectly </del>flat trapezium. Maxwell's equations were solved in the 2-D domain, thus the transverse electromagnetic vector could only be represented as a scalar. The 2-D model was due to the enormous amount of memory and computer time required by the Finite Difference method, which made a 3-D model in a home PC not practical. The results from the 2-D analysis showed an efficiency rating 2-3 times that of a perfectly collimated photon drive, which is beneath the reported measurements of EM Drive by NASA Eagleworks, Shawyer's SPR and Prof. Juan Yang's team at NWPU.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1313876#msg1313876 Initial calculations by aero.]</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>@Aero performed calculations for evanescent waves leaking from the EM Drive and producing an external near-field. He used a two-dimensional MEEP Finite Difference model that modeled the EM Drive <ins style="font-weight: bold; text-decoration: none;">truncated cone </ins>as a flat trapezium. Maxwell's equations were solved in the 2-D domain, thus the transverse electromagnetic vector could only be represented as a scalar. The 2-D model was due to the enormous amount of memory and computer time required by the Finite Difference method, which made a 3-D model in a home PC not practical. The results from the 2-D analysis showed an efficiency rating 2-3 times that of a perfectly collimated photon drive, which is beneath the reported measurements of EM Drive by NASA Eagleworks, Shawyer's SPR and Prof. Juan Yang's team at NWPU.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1313876#msg1313876 Initial calculations by aero.]</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Utilizing [http://ab-initio.mit.edu/wiki/index.php/Meep MEEP] 2-D model, the conclusion was that due to rapid dropoff at the frustum surface, evanescent waves were of insufficient magnitude to explain the observed thrust.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1330521#msg1330521 this post by @aero on modeled evanescent waves]</ref>. See details about @aero's [http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382078#msg1382078 MEEP control file].</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Utilizing [http://ab-initio.mit.edu/wiki/index.php/Meep MEEP] 2-D model, the conclusion was that due to rapid dropoff at the frustum surface, evanescent waves were of insufficient magnitude to explain the observed thrust.<ref>[http://forum.nasaspaceflight.com/index.php?topic=36313.msg1330521#msg1330521 this post by @aero on modeled evanescent waves]</ref>. See details about @aero's [http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382078#msg1382078 MEEP control file].</div></td></tr>
</table>127.0.0.1http://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=477&oldid=prev127.0.0.1 at 22:11, 1 June 20152015-06-01T22:11:32Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Later Rodal and Todd @WarpTech proposed at the NSF forum that the EmDrive's tapered conical design causes a gradient in the electromagnetic field such that travelling waves (from the RF source) propagating towards the small end of the truncated cone are attenuated by the tapering geometry, producing evanescent waves that carry momentum. The EM Drive must then accelerate to satisfy conservation of momentum. The standing waves inside the EM Drive (responsible for the high Q resonance) are comprised of travelling waves propagating in opposite directions. (How the evanescent waves travelling toward the small end may <del style="font-weight: bold; text-decoration: none;">carry some of </del>the stored energy from the standing waves remains to be analyzed.) <ref>[http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382031#msg1382031 Forum post by Rodal]</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Later Rodal and Todd @WarpTech proposed at the NSF forum that the EmDrive's tapered conical design causes a gradient in the electromagnetic field such that travelling waves (from the RF source) propagating towards the small end of the truncated cone are attenuated by the tapering geometry, producing evanescent waves that carry momentum. The EM Drive must then accelerate to satisfy conservation of momentum. The standing waves inside the EM Drive (responsible for the high Q resonance) are comprised of travelling waves propagating in opposite directions. (How the evanescent waves travelling toward the small end may <ins style="font-weight: bold; text-decoration: none;">benefit from </ins>the stored energy <ins style="font-weight: bold; text-decoration: none;">density </ins>from the standing waves remains to be analyzed.) <ref>[http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382031#msg1382031 Forum post by Rodal]</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Status ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Status ==</div></td></tr>
</table>127.0.0.1http://emdrive.echothis.com/index.php?title=Evanescent_waves&diff=476&oldid=prev127.0.0.1 at 22:10, 1 June 20152015-06-01T22:10:13Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:10, 1 June 2015</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l3">Line 3:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>@Aero first proposed that evanescent waves ''leaked'' from the interior of the EM Drive through small gaps and produced an ''external'' evanescent wave near-field. @Aero studied (with a MEEP 2-D model) the interaction of these evanescent waves with the environment around the EM Drive, for example the stainless steel vacuum chamber at NASA Eagleworks. Shortly after this, Paul March reported at NSF conducting a test at NASA Eagleworks with the EM Drive outside the stainless steel vacuum chamber that exhibited measured thrust and thus may have nullified this hypothesis (several tests conducted by R. Shawyer and by Prof. Juan Yang may have also been conducted in environments were such interaction may have been nullified). @Aero also proposed another hypothesis involving evanescent waves and tachyons (hypothetical particles travelling faster than photons). </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Later Rodal and Todd @WarpTech proposed at the NSF forum that the EmDrive's tapered conical design causes a gradient in the electromagnetic field such that travelling waves (from the RF source) propagating towards the small end of the truncated cone are attenuated by the tapering geometry, producing evanescent waves that carry momentum. The standing waves inside the EM Drive (responsible for the high Q resonance) are comprised of travelling waves propagating in opposite directions<del style="font-weight: bold; text-decoration: none;">. The EM Drive must then accelerate to satisfy conservation of momentum</del>. (How the evanescent waves travelling toward the small end may carry some of the stored energy from the standing waves remains to be analyzed.) <ref>[http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382031#msg1382031 Forum post by Rodal]</ref></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Later Rodal and Todd @WarpTech proposed at the NSF forum that the EmDrive's tapered conical design causes a gradient in the electromagnetic field such that travelling waves (from the RF source) propagating towards the small end of the truncated cone are attenuated by the tapering geometry, producing evanescent waves that carry <ins style="font-weight: bold; text-decoration: none;">momentum. The EM Drive must then accelerate to satisfy conservation of </ins>momentum. The standing waves inside the EM Drive (responsible for the high Q resonance) are comprised of travelling waves propagating in opposite directions. (How the evanescent waves travelling toward the small end may carry some of the stored energy from the standing waves remains to be analyzed.) <ref>[http://forum.nasaspaceflight.com/index.php?topic=37642.msg1382031#msg1382031 Forum post by Rodal]</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Status ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Status ==</div></td></tr>
</table>127.0.0.1