Injection of electron beam into a toroidal trap using chaotic orbits near magnetic null

C. Nakashima; Z. Yoshida; H. Himura; M. Fukao; J. Morikawa; H. Saitoh

doi:10.1103/PhysRevE.65.036409

Injection of electron beam into a toroidal trap using chaotic orbits near magnetic null

C. Nakashima, Z. Yoshida, H. Himura, M. Fukao, J. Morikawa, and H. Saitoh

Phys. Rev. E 65, 036409 – Published 21 February 2002

Abstract

Injection of charged particle beam into a toroidal magnetic trap enables a variety of interesting experiments on non-neutral plasmas. Stationary radial electric field has been produced in a toroidal geometry by injecting electrons continuously. When an electron gun is placed near an X point of magnetic separatrix, the electron beam spreads efficiently through chaotic orbits, and electrons distribute densely in the torus. The current returning back to the gun can be minimized less than 1% of the total emission.

Received 23 August 2001

DOI:https://doi.org/10.1103/PhysRevE.65.036409

Authors & Affiliations

C. Nakashima^1,*, Z. Yoshida², H. Himura², M. Fukao³, J. Morikawa³, and H. Saitoh²

¹Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
²Graduate School of Frontier Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
³High Temperature Plasma Center, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

^*Electronic address: nakasima@plasma.q.t.u-tokyo.ac.jp

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Vol. 65, Iss. 3 — March 2002

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