Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide
An electron beam passing through a metamaterial structure is predicted to generate reversed Cherenkov radiation, an unusual and potentially very useful property. We present an experimental test of this phenomenon using an intense electron beam passing through a metamaterial loaded waveguide. Power l...
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| Format: | Article |
| Language: | English |
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American Physical Society
2016
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| Online Access: | http://hdl.handle.net/1721.1/105737 https://orcid.org/0000-0002-3661-6267 https://orcid.org/0000-0001-9813-0177 |
| _version_ | 1811089298428002304 |
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| author | Hummelt, Jason Samuel Lu, X. Xu, H. Mastovsky, Ivan Shapiro, Michael Temkin, Richard J |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Hummelt, Jason Samuel Lu, X. Xu, H. Mastovsky, Ivan Shapiro, Michael Temkin, Richard J |
| author_sort | Hummelt, Jason Samuel |
| collection | MIT |
| description | An electron beam passing through a metamaterial structure is predicted to generate reversed Cherenkov radiation, an unusual and potentially very useful property. We present an experimental test of this phenomenon using an intense electron beam passing through a metamaterial loaded waveguide. Power levels of up to 5 MW are observed in backward wave modes at a frequency of 2.40 GHz using a one microsecond pulsed electron beam of 490 keV, 84 A in a 400 G magnetic field. Contrary to expectations, the output power is not generated in the Cherenkov mode. Instead, the presence of the magnetic field, which is required to transport the electron beam, induces a Cherenkov-cyclotron (or anomalous Doppler) instability at a frequency equal to the Cherenkov frequency minus the cyclotron frequency. Nonlinear simulations indicate that the Cherenkov-cyclotron mode should dominate over the Cherenkov instability at a lower magnetic field where the highest output power is obtained. |
| first_indexed | 2024-09-23T14:16:59Z |
| format | Article |
| id | mit-1721.1/105737 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:16:59Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1057372022-10-01T20:20:23Z Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide Hummelt, Jason Samuel Lu, X. Xu, H. Mastovsky, Ivan Shapiro, Michael Temkin, Richard J Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Hummelt, Jason Samuel Lu, X. Xu, H. Mastovsky, Ivan Shapiro, Michael Temkin, Richard J An electron beam passing through a metamaterial structure is predicted to generate reversed Cherenkov radiation, an unusual and potentially very useful property. We present an experimental test of this phenomenon using an intense electron beam passing through a metamaterial loaded waveguide. Power levels of up to 5 MW are observed in backward wave modes at a frequency of 2.40 GHz using a one microsecond pulsed electron beam of 490 keV, 84 A in a 400 G magnetic field. Contrary to expectations, the output power is not generated in the Cherenkov mode. Instead, the presence of the magnetic field, which is required to transport the electron beam, induces a Cherenkov-cyclotron (or anomalous Doppler) instability at a frequency equal to the Cherenkov frequency minus the cyclotron frequency. Nonlinear simulations indicate that the Cherenkov-cyclotron mode should dominate over the Cherenkov instability at a lower magnetic field where the highest output power is obtained. United States. Air Force Office of Scientific Research. Multidisciplinary University Research Initiative (Grant FA9550-12-1-0489) 2016-12-07T15:36:28Z 2016-12-07T15:36:28Z 2016-12 2016-04 2016-12-02T23:00:03Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/105737 Hummelt, J. S. et al. “Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide.” Physical Review Letters 117.23 (2016): n. pag. © 2016 American Physical Society https://orcid.org/0000-0002-3661-6267 https://orcid.org/0000-0001-9813-0177 en http://dx.doi.org/10.1103/PhysRevLett.117.237701 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Hummelt, Jason Samuel Lu, X. Xu, H. Mastovsky, Ivan Shapiro, Michael Temkin, Richard J Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide |
| title | Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide |
| title_full | Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide |
| title_fullStr | Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide |
| title_full_unstemmed | Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide |
| title_short | Coherent Cherenkov-Cyclotron Radiation Excited by an Electron Beam in a Metamaterial Waveguide |
| title_sort | coherent cherenkov cyclotron radiation excited by an electron beam in a metamaterial waveguide |
| url | http://hdl.handle.net/1721.1/105737 https://orcid.org/0000-0002-3661-6267 https://orcid.org/0000-0001-9813-0177 |
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