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Title:
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Observation and Study of Low-Frequency Oscillations in a 1.5-MW 110-GHz Gyrotron |
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Author:
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Cerfon, A.J.; Eunmi Choi, A.J.; Marchewka, C.D.; Mastovsky, I.; Shapiro, M.A.; Sirigiri, J.R.; Temkin, R.J. |
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Department:
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Massachusetts Institute of Technology. Plasma Science and Fusion Center; Massachusetts Institute of Technology. Dept. of Physics |
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Publisher:
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Institute of Electrical and Electronics Engineers |
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Issue Date:
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2009-06 |
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Abstract:
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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. |
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URI:
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http://hdl.handle.net/1721.1/52350
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ISSN:
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0093-3813 |
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Citation:
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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 |
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Version:
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Final published version |
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Terms of Use:
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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. |
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Published as:
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http://dx.doi.org/10.1109/TPS.2009.2020903
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Journal:
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IEEE Transactions on Plasma Science |
