| Project/Area Number |
07680517
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
プラズマ理工学
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| Research Institution | Institute of Space and Astronautical Science |
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Principal Investigator |
SAITO Hirobumi Inst.Space & Astronautical Science., 次世代探査機研究センター, 助教授 (80150051)
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| Co-Investigator(Kenkyū-buntansha) |
MIZUNO Takahide Inst.Space & Astronautical Science., 宇宙探査工学研究系, 助手 (50270442)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1995: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | free electron laser / Smith-Purcell effect / relativistic electron beam / metal grating / coherent radiation / millimeter wave / submillimeter wave / oscillator / コヒーレント放射 / ミリ波 / 静電加速器 |
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| Research Abstract |
The purpose of this research in 1995-1996 is the experimental research on Smith Purcel free electron laser in millimeter wave region.
We operated a compact electrostatic accelerator (Disktron) with 1MV voltage. The electron source is photoelectron emission with KrF ultraviolet laser. This conbination of the electron source as well as the accelerator is suitable for precise control of the elctron beam. We successfully obtained the electron beam with 1-4 A peak current, 800KeV energy, and 30ns pulse width. This beam is propageted in the beam line, which is evacuated by a turbmolecular pump and a cryopump. The beam is well controlled by focusing magnets as well as deflection magnets.
The theoretical analysis is performed, taking into account the dispersion relation of the electron beam mode and the electromagnetic waves near a metal grating. We design the Smith Purcel free electron laser with theoretical oscillation frequency of 51GHz. The grating pitch is 25mm and the length is 300mm.
With aid of the focusing magnetic coils and deflection coils, the electron is carefully controlled to propagate near the grating surface. We observed the radiation from the interaction region with the U band (45-60GHz) detector diode. The power received by the diode is nearly 0dBm.
We will continue the experiment. However, we think that what we observe is the 51GHz Smith-Purcel free electron laser oscillation, which is predicted by the theory.
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