DocumentCode :
1018225
Title :
Experiments on injecting electrons into helical magnetic field configuration
Author :
Himura, Haruhiko ; Wakabayashi, Hidenori ; Fukao, Masayuki ; Isobe, Mitsutaka ; Okamura, Shoichi ; Yamada, Hiroshi
Author_Institution :
Dept. of Adv. Energy, Univ. of Tokyo, Japan
Volume :
32
Issue :
2
fYear :
2004
fDate :
4/1/2004 12:00:00 AM
Firstpage :
510
Lastpage :
516
Abstract :
An experimental study on injecting an electron beam into a helical vacuum magnetic field via stochastic (chaotic) magnetic field region has been conducted on the compact helical system device. Remarkably, despite being launched from the outside of the last closed flux surface (LCFS), the injected electrons move across the LCFS and, moreover, penetrate deeply into the magnetic surfaces. This penetration of electrons occurs in a collisionless process that has never been observed in past studies on toroidal nonneutral plasmas confined in axisymmetric geometry. Data clearly suggest that the stochastic magnetic region, which confines a considerable number of electrons, plays a key role in the observed collisionless penetration.
Keywords :
plasma beam injection heating; plasma toroidal confinement; stellarators; LCFS; axisymmetric geometry; chaotic magnetic field region; collisionless penetration; collisionless process; compact helical system device; electron beam injection; electron penetration; helical vacuum magnetic field configuration; last closed flux surface; magnetic surfaces; stochastic magnetic field region; toroidal nonneutral confined plasmas; Chaos; Electron beams; Magnetic confinement; Magnetic fields; Magnetic flux; Plasma confinement; Plasma devices; Stochastic systems; Toroidal magnetic fields; Vacuum systems; Chaos; charge injection; magnetic confinement; plasmas;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/TPS.2004.826147
Filename :
1308500
Link To Document :
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