Experiments on Nonlinear Waves in Nonneutral Plasmas
| Project/Area Number |
07680506
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
TANAKA Hitoshi Kyoto Uni., Energy Science, Associate Professor, エネルギー科学研究科, 助教授 (90183863)
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| Co-Investigator(Kenkyū-buntansha) |
MICHISHITA Toshinori Kyoto Univ., Integrated Human Studies, Assistant, 総合人間学部, 助手 (00166050)
YUYAMA Tetsumori Kyoto Univ., Integrated Human Studies, Assistant, 総合人間学部, 助手 (90026815)
MOHRI Akihiro Kyoto Univ., Integrated Human Studies, Professor, 総合人間学部, 教授 (10025926)
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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: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Nonneutral Plasma / Nonlinear Waves / Electrostatic Mode Waves / Pure Electrom Plasmas / Positron Plasmas |
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| Research Abstract |
In this year, experiments on finite amplitude waves in nonneutral electron plasmas have been carried out and the phenomena of nonlinear mode coupling is observed. The new confinement device have also been built for the further research on solitons.
(1) "quiecent" nonneutral electron plasmas (20cm in length and 10^7-10^8cm^<-3>) is confined in the Penning trap-type potential well produced by the multi-ring-electrodes (MRE). Low (l, m) modes of electrostatic wave are excited by applying rf on one of the ring electrodes. When the applied rf voltage exceed a threshold level, the pump wave damps away and other modes appear. This phenomena is caused by nonlinear mode coupling of electrostatic waves. A simple nonlinear coupling model is shown.
(2) Electrostatic waves can be excited resonantly by injecting electron beams through the plasmas modulated at the frequencies of the electrostatic waves.
(3) The new confinement device have been built for the reserch on solitons, in which the long plasma column is necessary. The device has 41 ring electrode and the confinement region of 80 cm. It also has 3 eight-divided-electrodes. We are now carrying out the experiment on solitons and planning the experiment on echoes.
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Report
(3 results)
Research Products
(4 results)
