Ampere-class bright field emission cathode operated at 100 MV/m
High-current bright sources are needed to power the next generation of compact rf and microwave systems. A major requirement is that such sources could be sustainably operated at high frequencies, well above 1 GHz, and high gradients, well above 100 MV/m. Field emission sources offer simplicity and...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-12-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.24.123401 |
| _version_ | 1819099919023079424 |
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| author | Mitchell E. Schneider Benjamin Sims Emily Jevarjian Ryo Shinohara Tanvi Nikhar Taha Y. Posos Wanming Liu John Power Jiahang Shao Sergey V. Baryshev |
| author_facet | Mitchell E. Schneider Benjamin Sims Emily Jevarjian Ryo Shinohara Tanvi Nikhar Taha Y. Posos Wanming Liu John Power Jiahang Shao Sergey V. Baryshev |
| author_sort | Mitchell E. Schneider |
| collection | DOAJ |
| description | High-current bright sources are needed to power the next generation of compact rf and microwave systems. A major requirement is that such sources could be sustainably operated at high frequencies, well above 1 GHz, and high gradients, well above 100 MV/m. Field emission sources offer simplicity and scalability in a high-frequency era of the injector design, but the output rf cycle charge and high-gradient operation remain a great and largely unaddressed challenge. Here, a field emission cathode based on ultra-nano-crystalline diamond, an efficient planar field emission material, was tested at 100 MV/m in an L-band injector. A very high charge of 38 pC per rf cycle was demonstrated (300 nC per rf pulse corresponding to an rf pulse current of 120 mA). This operating condition revealed a two-dimensional space charge limited emission where the one-dimensional Child-Langmuir limit was surpassed. An injector brightness of 10^{14} A/(rad m)^{2} was estimated for the given operating conditions. |
| first_indexed | 2024-12-22T00:54:31Z |
| format | Article |
| id | doaj.art-853b6d8beb8e4937a60de22b220207d1 |
| institution | Directory Open Access Journal |
| issn | 2469-9888 |
| language | English |
| last_indexed | 2024-12-22T00:54:31Z |
| publishDate | 2021-12-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Accelerators and Beams |
| spelling | doaj.art-853b6d8beb8e4937a60de22b220207d12022-12-21T18:44:21ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882021-12-01241212340110.1103/PhysRevAccelBeams.24.123401Ampere-class bright field emission cathode operated at 100 MV/mMitchell E. SchneiderBenjamin SimsEmily JevarjianRyo ShinoharaTanvi NikharTaha Y. PososWanming LiuJohn PowerJiahang ShaoSergey V. BaryshevHigh-current bright sources are needed to power the next generation of compact rf and microwave systems. A major requirement is that such sources could be sustainably operated at high frequencies, well above 1 GHz, and high gradients, well above 100 MV/m. Field emission sources offer simplicity and scalability in a high-frequency era of the injector design, but the output rf cycle charge and high-gradient operation remain a great and largely unaddressed challenge. Here, a field emission cathode based on ultra-nano-crystalline diamond, an efficient planar field emission material, was tested at 100 MV/m in an L-band injector. A very high charge of 38 pC per rf cycle was demonstrated (300 nC per rf pulse corresponding to an rf pulse current of 120 mA). This operating condition revealed a two-dimensional space charge limited emission where the one-dimensional Child-Langmuir limit was surpassed. An injector brightness of 10^{14} A/(rad m)^{2} was estimated for the given operating conditions.http://doi.org/10.1103/PhysRevAccelBeams.24.123401 |
| spellingShingle | Mitchell E. Schneider Benjamin Sims Emily Jevarjian Ryo Shinohara Tanvi Nikhar Taha Y. Posos Wanming Liu John Power Jiahang Shao Sergey V. Baryshev Ampere-class bright field emission cathode operated at 100 MV/m Physical Review Accelerators and Beams |
| title | Ampere-class bright field emission cathode operated at 100 MV/m |
| title_full | Ampere-class bright field emission cathode operated at 100 MV/m |
| title_fullStr | Ampere-class bright field emission cathode operated at 100 MV/m |
| title_full_unstemmed | Ampere-class bright field emission cathode operated at 100 MV/m |
| title_short | Ampere-class bright field emission cathode operated at 100 MV/m |
| title_sort | ampere class bright field emission cathode operated at 100 mv m |
| url | http://doi.org/10.1103/PhysRevAccelBeams.24.123401 |
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