抄録
Offer Organization: Japan Society for the Promotion of Science, System Name: Grants-in-Aid for Scientific Research, Category: Grant-in-Aid for Scientific Research (A)., Fund Type: -, Overall Grant Amount: - (direct: 29500000, indirect: -)
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.