| Project/Area Number |
12680474
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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 | Yokohama National University |
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Principal Investigator |
TSUSHIMA Akira Yokohama National Univ., Faculty of Engineering, Associate Professor, 大学院・工学研究院, 助教授 (90171991)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIHARA Osamu Yokohama National Univ., Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (20313463)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Electrou Acceleration / Fermi Acceleration / Stochastic Acceleration / Electrostatic Potontial / Electror Cloud / Phase Space / Chaos / Island Structuro |
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| Research Abstract |
The purpose of this work is to study the characteristics of Fermi acceleration, which is one of the basic acceleration mechanisms of space and laboratory plasmas. The followings are the main results :
(1) Construction of a laboratory system.
Electrons moving along magnetic field lines are confined by two electrostatic potential walls and were accelerated by the oscillation of one of the two potential walls. The conditions for the laboratory system are the vacuum less than 1 × 10^(-4) Pa and the accuracy of the magnetic field alignment with the electron trap less than 5 × l0^(-3).
(2) Observation of resonant frequency for the acceleration of electrons reflected by an oscillating electrostatic potential wall.
When the potential wail oscillated with a characteristic frequency associated with the spatial structure of the potential wall, strong electron acceleration was observed. The characteristic frequency is then expressed by f_0= 2eV_0/(πmS^2) when the potential wall is given by V = -V_0 (x/s)^2 for x < 0 and V = 0 for x 【greater than or equal】 0.
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