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Title: Stability analysis of a two-stage tapered gyrotron traveling-wave tube amplifier with distributed losses

Abstract

The two-stage tapered gyrotron traveling-wave tube (gyro-TWT) amplifier has achieved wide bandwidth in the millimeter wave range. However, possible oscillations in each stage limit this amplifier's operating beam current and thus its output power. To further enhance the amplifier's stability, distributed losses are applied to the interaction circuit of the two-stage tapered gyro-TWT. A self-consistent particle-tracing code is used for analyzing the beam-wave interactions. The stability analysis includes the effects of the wall losses and the length of each stage on the possible oscillations. Simulation results reveal that the distributed-loss method effectively stabilizes all the oscillations in the two stages. Under stable operating conditions, the device is predicted to produce a peak power of 60 kW with an efficiency of 29% and a saturated gain of 52 dB in the Ka-band. The 3-dB bandwidth is 5.7 GHz, which is approximately 16% of the center frequency.

Authors:
 [1]; ;  [2];  [3];  [4]
  1. Department of Communication Engineering, National Penghu University of Science and Technology, Penghu 880, Taiwan (China)
  2. Graduate Institute of Electrical Engineering and Computer Science, National Penghu University of Science and Technology, Penghu 880, Taiwan (China)
  3. Department of Electro-Optical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan (China)
  4. Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan (China)
Publication Date:
OSTI Identifier:
22068912
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 11; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAM CURRENTS; EFFICIENCY; GHZ RANGE; MICROWAVE AMPLIFIERS; OSCILLATIONS; PLASMA SIMULATION; STABILITY; TRAVELLING WAVE TUBES

Citation Formats

Hung, C. L., Lian, Y. H., Cheng, N. H., Yeh, Y. S., and Chang, T. H. Stability analysis of a two-stage tapered gyrotron traveling-wave tube amplifier with distributed losses. United States: N. p., 2012. Web. doi:10.1063/1.4768436.
Hung, C. L., Lian, Y. H., Cheng, N. H., Yeh, Y. S., & Chang, T. H. Stability analysis of a two-stage tapered gyrotron traveling-wave tube amplifier with distributed losses. United States. doi:10.1063/1.4768436.
Hung, C. L., Lian, Y. H., Cheng, N. H., Yeh, Y. S., and Chang, T. H. Thu . "Stability analysis of a two-stage tapered gyrotron traveling-wave tube amplifier with distributed losses". United States. doi:10.1063/1.4768436.
@article{osti_22068912,
title = {Stability analysis of a two-stage tapered gyrotron traveling-wave tube amplifier with distributed losses},
author = {Hung, C. L. and Lian, Y. H. and Cheng, N. H. and Yeh, Y. S. and Chang, T. H.},
abstractNote = {The two-stage tapered gyrotron traveling-wave tube (gyro-TWT) amplifier has achieved wide bandwidth in the millimeter wave range. However, possible oscillations in each stage limit this amplifier's operating beam current and thus its output power. To further enhance the amplifier's stability, distributed losses are applied to the interaction circuit of the two-stage tapered gyro-TWT. A self-consistent particle-tracing code is used for analyzing the beam-wave interactions. The stability analysis includes the effects of the wall losses and the length of each stage on the possible oscillations. Simulation results reveal that the distributed-loss method effectively stabilizes all the oscillations in the two stages. Under stable operating conditions, the device is predicted to produce a peak power of 60 kW with an efficiency of 29% and a saturated gain of 52 dB in the Ka-band. The 3-dB bandwidth is 5.7 GHz, which is approximately 16% of the center frequency.},
doi = {10.1063/1.4768436},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 11,
volume = 19,
place = {United States},
year = {2012},
month = {11}
}