1990 Fiscal Year Final Research Report Summary
Studies on Frequency Tunable High Power Submillimeter Wave Source.
| Project/Area Number |
63400002
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
広領域
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| Research Institution | Tohoku University |
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Principal Investigator |
ONO Shoichi Tohoku Univ. Res. Inst. Elec. Comm., Prof., 電気通信研究所, 教授 (00005232)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Nobuyuki Tohoku Univ. Rese. Inst. Elec. Comm., Res. Associate, 電気通信研究所, 助手 (10178759)
YOKOO Kuniyoshi Tohoku Univ. Res. Inst. Elec. Comm., Associate Prof., 電気通信研究所, 助教授 (60005428)
TERUMICHI Yasushi Kyoto Univ. Faculty of Science, Associate Prof., 理学部, 助教授 (50025384)
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| Project Period (FY) |
1988 – 1990
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| Keywords | Peniotron / Gyrotron / Free electron laser / Microwave tube / Plasma heating |
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| Research Abstract |
High power millimeter wave tubes are great important devices in fusion plasma researches for the electron cyclotron resonance heating and plasma diagonostics. The development of tube with shorter wavelength up to submillimeter wave range and wide band frequency tunability is especially required in large fusion devices. This project is focussed to investigate the backward wave operation for the frequency tunability and the harmonic cyclotron operation for the shorter wavelength generation in the peniotron tube with a high conversion efficiency. We have designed and fabricated several test tubes to investigate experimentally above capabilities in future peniotron development. Research results in this project are as follows.
1. The electronic efficiency of 72% was experimentally obtained in the auto-resonant peniotron test tube. The value of efficiency is the highest in the cyclotron fast wave tube.
2. The continuous frequency tuning with wide band ranging from 8 to 12GHz was obtained in the backward wave peniotron test tube. The result is the first experimental investigation in the cyclotron fast wave tube.
3. The 2nd cyclotron harmonic operation was first demonstrated in the high cyclotron harmonic peniotron test tube and the experiments are still continuing to investigate higher efficiency operation at the high cyclotron harmonics.
4. A short millimeter wave test tube was designed and fabricated to extend the frequency range to 100GHz. Experiments will be started at the beginning in 1991.
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Research Products
(32 results)
