Study of the Effect of Reflections on High-Power, 110-GHz Pulsed Gyrotron Operation

Genoud, J.; Picard, J. F.; Schaub, S. C.; Jawla, S. K.; Shapiro, M. A.; Temkin, R. J.

doi:10.1007/s10762-021-00769-8

Title: Study of the Effect of Reflections on High-Power, 110-GHz Pulsed Gyrotron Operation

Journal Article · Fri Feb 05 00:00:00 EST 2021 · Journal of Infrared, Millimeter, and Terahertz Waves

DOI:https://doi.org/10.1007/s10762-021-00769-8· OSTI ID:1779098

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Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Air Force Research Lab. (AFRL), Albuquerque, NM (United States)

The effect of reflection is studied experimentally and theoretically on a high-power 110-GHz gyrotron operating in the TE_22,6 mode in 3 μs pulses at 96 kV, 40 A. The experimental setup allows variation of the reflected power from 0 to 33% over a range of gyrotron operating conditions. The phase of the reflection is varied by translating the reflector along the axis. Operating at a higher efficiency point, at 4.40 T with 940kW of output power, reflected power exceeding 11% causes a switch from operation in the TE_22,6 to simultaneous operation in the TE_22,6 and TE_21,6 modes with a large decrease of the total gyrotron output power. This switching effect is in good agreement with simulations using the MAGY code. Operating at a more stable point, 4.44 T with 580kW of output power, when the reflection is increased, the output power remains in the TE_22,6 mode but it decreases monotonically with increasing reflection, dropping to 200kW at 33% reflection. Furthermore, at a reflection above 22%, a power modulation at 25 to 30MHz is observed, independent of the phase of the reflected wave. Such a modulated signal may be useful in spectroscopic and other applications.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Institutes of Health (NIH)

Grant/Contract Number:: FC02-93ER54186; SC0015566; R01-EB001965; R01-EB004866

OSTI ID:: 1779098

Journal Information:: Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 42, Issue 5; ISSN 1866-6892

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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