| Project/Area Number |
25820138
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Electron device/Electronic equipment
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| Research Institution | University of Fukui |
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Principal Investigator |
YAMAGUCHI YUUSUKE 福井大学, 遠赤外領域開発研究センター, 特命助教 (10466675)
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| Research Collaborator |
TATEMATSU Yoshinori 福井大学, 遠赤外領域開発研究センター, 准教授 (50261756)
SAITO Teruo 福井大学, 遠赤外領域開発研究センター, 教授 (80143163)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | ジャイロトロン / テラヘルツ / マグネトロン入射型電子銃 / ラミナー流 / 多周波数発振 / 協同トムソン散乱 / ポジトロニウム |
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| Outline of Final Research Achievements |
In gyrotrons, formation of a laminar flow is essential to realizing a high-quality electron beam with a small velocity-spread. The electron-optical system was investigated to adjust each electron trajectory in magnetron injection guns (MIGs). it is found that increase in the laminarity is possible with a properly arranged potential profile between the cathode and anode. In the well-laminated beam, the axial pitch of each gyro-motion is modified such that all trajectories have almost the same gyration phase in a plane perpendicular to the magnetic field line.
The above considerations result in the optimum MIG designs for a 300 GHz pulsed tube and a step-frequency-tunable (162 - 265 GHz) tube. The 300 GHz tube showed a maximum power output of 246 kW with an efficiency of 27%, which satisfies the demand on CTS diagnostic in LHD. The step-frequency tunable tube was successfully operated at designed 10 different frequencies with powers of the order of 1 kW.
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