| Project/Area Number |
10680466
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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 Institute of Space and Astronantial Science, Division of Space Exploration, Professor, 宇宙探査工学研究系, 教授 (80150051)
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| Co-Investigator(Kenkyū-buntansha) |
MIZUNO Takahide Institute of Space and Astronanticul Science, Center for Advanced Spacecraft Technology, Associate Professor, 次世代探査機研究センター, 助教授 (50270442)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | submillimeter wave / millimeter wave / freee election laser / relativistic electron beam / 遠赤外線 / スミス・パーセル |
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| Research Abstract |
We study on a possible coherent radiation source in short millimeter wave on submillimeter wave region, where there are not practical radiation sources. Free-Election Lasers (FELs) can be compact coherent radiation sources with frequency-tunable characteristics.
In this study, we experimentally study on two types of FELs. One is a Smith-Purcell FEL, and the other is a micro-wiggler FEL.Smith-Purcel FELs utilize the slow- wave interaction with evanescent wave, which exists near the surface of a conductive grating. The election beam has to propagate very close the metal grating surface. Micro-wiggler FELs utilize the fast-wave interaction between an electro-magnetic wave and a beam mode in a micro-wiggler magnetic field. The election beam propagates in the wiggler magnetic field.
We construct a compact disctron-type electrostatic accelerator up to 1MV.The election injection is performed by a photo-cathode with a KrF excimer laser. The electron beam parameters are about 7OOKeV of energy, 1A of current, 3Onsec of pulse width.
We design the metal gratings for 100GHz and 300GHz Smith-Purcel FEL.However, we have not observed radiation signals at all. The reason of this result may be that the electron current which propagates near the metal grating surface is not enough for Smith-Purcell FEL oscillation.
For the micro-wiggler FEL, we design the micro-wiggler with permanent magnets with 8mm period and 3mm gap. In the micro-wiggler we install a wave guide resonator with Bragg reflectors. The election beam is carefully controlled to propagate through the wave-guide resonator. At present, we observe a radiation signal at 103 GHz, which cones ponds to the design frequency. We keep the investigation this radiation signal in relation to the cavity property.
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