2000 Fiscal Year Final Research Report Summary
Toroidal Magnetic Confinement of Non-neutral Plasmas
| Project/Area Number |
09308011
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| Research Category |
Grant-in-Aid for Scientific Research (A).
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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 | The University of Tokyo |
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Principal Investigator |
YOSHIDA Zensho University of Tokyo, Graduate School of Frontier Sciences, Professor, 大学院・新領域創成科学研究科, 教授 (80182765)
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| Co-Investigator(Kenkyū-buntansha) |
TATSUNO Tomoya University of Tokyo, Graduate School of Frontier Sciences, Professor, 大学院・新領域創成科学研究科, 助手 (60313011)
HIMURA Haruhiko University of Tokyo, Graduate School of Frontier Sciences, Professor, 大学院・新領域創成科学研究科, 助教授 (30311632)
OGAWA Yuichi University of Tokyo, Graduate School of Frontier Sciences, Professor, 教授 (90144170)
MORIKAWA Junji University of Tokyo, Graduate School of Frontier Sciences, Professor, 助手 (70192375)
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| Project Period (FY) |
1997 – 2000
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| Keywords | Non-neutral plasma / Collective phenomena / Self-organization / Non-Hermitian dynamics / Chaos / Nuclear fusion / Antimatter / Trap |
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| Research Abstract |
A new method of producing non-neutral plasmas has been developed with introducing an innovative scheme of injecting particles into a toroidal magnetic shear configuration. This method can be applied to various particle traps, as well as an ultra-high-beta fusion device that is suitable for advanced fusion. Unique features in this concept, in comparison with other conventional electric-field traps (such as the Penning trap), are summarized as follows ; (1) This pure magnetic confinement device can trap very high-energy particles directly ; (2) Continuous injection of particles enables to produce a high-density (up to the Brillouin limit) plasma ; (3) Multi-species particles with opposite charges can be confined simultaneously. The key issues of development were (A) the application of magnetic shear to stabilize the plasma and (B) the production of the chaos-induced collision-less diffusion to inject particles into the trapping region. Using this non-neutral plasma system, we have studied (I) the new-type of relaxed state in a plasma with an intense shear flow, (II) the anomalous diffusion and resistance induced by the chaos of particle motion in magnetic null region, (III) the non-Hermitian dynamics of vortices in a shear flow, and (IV) magnetic shear stabilization of electrostatic instabilities.
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