Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron
We report the observation of low-frequency oscillations (LFOs) in the range 165-180 MHz in a 1.5-MW 110-GHz gyrotron operating in 3-mus pulses. The oscillations have been measured by a capacitive probe located just before the entrance to the cavity. The LFOs are observed only in a narrow region of b...
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| Format: | Article |
| Language: | en_US |
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Institute of Electrical and Electronics Engineers
2010
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| Online Access: | http://hdl.handle.net/1721.1/52350 https://orcid.org/0000-0003-3326-4785 https://orcid.org/0000-0001-9813-0177 |
| _version_ | 1826209049391136768 |
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| author | Cerfon, Antoine J. Choi, Eunmi Marchewka, Chad D. Mastovsky, Ivan Shapiro, Michael Sirigiri, Jagadishwar R. Temkin, Richard J. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Cerfon, Antoine J. Choi, Eunmi Marchewka, Chad D. Mastovsky, Ivan Shapiro, Michael Sirigiri, Jagadishwar R. Temkin, Richard J. |
| author_sort | Cerfon, Antoine J. |
| collection | MIT |
| description | We report the observation of low-frequency oscillations (LFOs) in the range 165-180 MHz in a 1.5-MW 110-GHz gyrotron operating in 3-mus pulses. The oscillations have been measured by a capacitive probe located just before the entrance to the cavity. The LFOs are observed only in a narrow region of beam parameter space, at voltages between 45 and 60 kV, where no microwave emission occurs. When the gyrotron operates near 96 kV, with high output power, they are not seen. The variation of the frequency of the oscillations with electron beam voltage and magnetic compression was measured, and the results are reported. Time-domain analysis of the probe signal shows the influence of the beam current and cathode voltage on the time of onset of the oscillations. The amplitude of the time-domain signal indicates that the trapped electron current associated with the LFOs represents a few percent of the total electron current. |
| first_indexed | 2024-09-23T14:16:32Z |
| format | Article |
| id | mit-1721.1/52350 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:16:32Z |
| publishDate | 2010 |
| publisher | Institute of Electrical and Electronics Engineers |
| record_format | dspace |
| spelling | mit-1721.1/523502022-09-28T19:41:07Z Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron Cerfon, Antoine J. Choi, Eunmi Marchewka, Chad D. Mastovsky, Ivan Shapiro, Michael Sirigiri, Jagadishwar R. Temkin, Richard J. Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Sirigiri, Jagadishwar R. Cerfon, Antoine J. Mastovsky, Ivan Shapiro, Michael Sirigiri, Jagadishwar R. Temkin, Richard J. trapped electrons low-frequency oscillations (LFOs) high-power microwave source gyrotron fusion We report the observation of low-frequency oscillations (LFOs) in the range 165-180 MHz in a 1.5-MW 110-GHz gyrotron operating in 3-mus pulses. The oscillations have been measured by a capacitive probe located just before the entrance to the cavity. The LFOs are observed only in a narrow region of beam parameter space, at voltages between 45 and 60 kV, where no microwave emission occurs. When the gyrotron operates near 96 kV, with high output power, they are not seen. The variation of the frequency of the oscillations with electron beam voltage and magnetic compression was measured, and the results are reported. Time-domain analysis of the probe signal shows the influence of the beam current and cathode voltage on the time of onset of the oscillations. The amplitude of the time-domain signal indicates that the trapped electron current associated with the LFOs represents a few percent of the total electron current. U.S. Department of Energy, Office of Fusion Energy Sciences 2010-03-05T18:39:44Z 2010-03-05T18:39:44Z 2009-06 2009-02 Article http://purl.org/eprint/type/JournalArticle 0093-3813 http://hdl.handle.net/1721.1/52350 Cerfon, A.J. et al. “Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron.” Plasma Science, IEEE Transactions on 37.7 (2009): 1219-1224. © 2009 Institute of Electrical and Electronics Engineers https://orcid.org/0000-0003-3326-4785 https://orcid.org/0000-0001-9813-0177 en_US http://dx.doi.org/10.1109/TPS.2009.2020903 IEEE Transactions on Plasma Science 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. application/pdf Institute of Electrical and Electronics Engineers IEEE |
| spellingShingle | trapped electrons low-frequency oscillations (LFOs) high-power microwave source gyrotron fusion Cerfon, Antoine J. Choi, Eunmi Marchewka, Chad D. Mastovsky, Ivan Shapiro, Michael Sirigiri, Jagadishwar R. Temkin, Richard J. Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron |
| title | Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron |
| title_full | Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron |
| title_fullStr | Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron |
| title_full_unstemmed | Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron |
| title_short | Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron |
| title_sort | observation and study of low frequency oscillations in a 1 5 mw 110 ghz gyrotron |
| topic | trapped electrons low-frequency oscillations (LFOs) high-power microwave source gyrotron fusion |
| url | http://hdl.handle.net/1721.1/52350 https://orcid.org/0000-0003-3326-4785 https://orcid.org/0000-0001-9813-0177 |
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