Periodically corrugated waveguides for slow-wave THz free-electron laser
We investigate a slow-wave THz free-electron laser consisting of axially or helically corrugated waveguides driven by an annular electron beam. When the device is driven by a 10-mA electron beam at 30 keV, we numerically demonstrated backward-wave oscillation at 0.2212 and 0.2651 THz in axially and...
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-04-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.28.040701 |
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| author | Hossein Shirvani Chih-Ying Lien Yen-Chieh Huang |
| author_facet | Hossein Shirvani Chih-Ying Lien Yen-Chieh Huang |
| author_sort | Hossein Shirvani |
| collection | DOAJ |
| description | We investigate a slow-wave THz free-electron laser consisting of axially or helically corrugated waveguides driven by an annular electron beam. When the device is driven by a 10-mA electron beam at 30 keV, we numerically demonstrated backward-wave oscillation at 0.2212 and 0.2651 THz in axially and helically corrugated waveguides, respectively, without a solenoid field within a submillimeter aperture. We developed a unified theoretical framework for the two types of waveguides and successfully explained the observed backward-wave resonances. In our theory, azimuthal-symmetry breaking in a helically corrugated waveguide couples the synchronous transverse-magnetic radiation mode to a transverse-electric mode, resulting in radiation loss for the oscillation. Therefore, this study concludes superior radiation performance for the axially corrugated waveguide as a slow-wave THz free-electron laser. Furthermore, we show the opportunity of exciting self-started cyclotron resonance maser oscillations at THz frequencies from a helically corrugated waveguide without a solenoid field. |
| format | Article |
| id | doaj-art-5d1347fc0b7d438ba6dc945102511344 |
| institution | OA Journals |
| issn | 2469-9888 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Accelerators and Beams |
| spelling | doaj-art-5d1347fc0b7d438ba6dc9451025113442025-08-20T02:08:07ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882025-04-0128404070110.1103/PhysRevAccelBeams.28.040701Periodically corrugated waveguides for slow-wave THz free-electron laserHossein ShirvaniChih-Ying LienYen-Chieh HuangWe investigate a slow-wave THz free-electron laser consisting of axially or helically corrugated waveguides driven by an annular electron beam. When the device is driven by a 10-mA electron beam at 30 keV, we numerically demonstrated backward-wave oscillation at 0.2212 and 0.2651 THz in axially and helically corrugated waveguides, respectively, without a solenoid field within a submillimeter aperture. We developed a unified theoretical framework for the two types of waveguides and successfully explained the observed backward-wave resonances. In our theory, azimuthal-symmetry breaking in a helically corrugated waveguide couples the synchronous transverse-magnetic radiation mode to a transverse-electric mode, resulting in radiation loss for the oscillation. Therefore, this study concludes superior radiation performance for the axially corrugated waveguide as a slow-wave THz free-electron laser. Furthermore, we show the opportunity of exciting self-started cyclotron resonance maser oscillations at THz frequencies from a helically corrugated waveguide without a solenoid field.http://doi.org/10.1103/PhysRevAccelBeams.28.040701 |
| spellingShingle | Hossein Shirvani Chih-Ying Lien Yen-Chieh Huang Periodically corrugated waveguides for slow-wave THz free-electron laser Physical Review Accelerators and Beams |
| title | Periodically corrugated waveguides for slow-wave THz free-electron laser |
| title_full | Periodically corrugated waveguides for slow-wave THz free-electron laser |
| title_fullStr | Periodically corrugated waveguides for slow-wave THz free-electron laser |
| title_full_unstemmed | Periodically corrugated waveguides for slow-wave THz free-electron laser |
| title_short | Periodically corrugated waveguides for slow-wave THz free-electron laser |
| title_sort | periodically corrugated waveguides for slow wave thz free electron laser |
| url | http://doi.org/10.1103/PhysRevAccelBeams.28.040701 |
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