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Title: Study of negative hydrogen ion beam optics using the 3D3V PIC model

The mechanism of negative ion extraction under real conditions with the complex magnetic field is studied by using the 3D PIC simulation code. The extraction region of the negative ion source for the negative ion based neutral beam injection system in fusion reactors is modelled. It is shown that the E x B drift of electrons is caused by the magnetic filter and the electron suppression magnetic field, and the resultant asymmetry of the plasma meniscus. Furthermore, it is indicated that that the asymmetry of the plasma meniscus results in the asymmetry of negative ion beam profile including the beam halo. It could be demonstrated theoretically that the E x B drift is not significantly weakened by the elastic collisions of the electrons with neutral particles.
Authors:
 [1] ; ; ;  [2] ; ;  [3]
  1. Naruto University of Education, 748 Nakashima, Takashima, Naruto-cho, Naruto-shi, Tokushima, 772-8502 (Japan)
  2. Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522 (Japan)
  3. Japan Atomic Energy Agency, 801-1,Mukoyama, Naka, 319-0913 (Japan)
Publication Date:
OSTI Identifier:
22391441
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1655; Journal Issue: 1; Conference: NIBS 2014: 4. International Symposium on Negative Ions, Beams and Sources, Garching (Germany), 6-10 Oct 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ASYMMETRY; BEAM OPTICS; BEAM PROFILES; COMPUTERIZED SIMULATION; ELECTRON COLLISIONS; ELECTRON DRIFT; ELECTRONS; HYDROGEN IONS 1 MINUS; ION DRIFT; MAGNETIC FIELDS; MAGNETIC FILTERS; NEUTRAL ATOM BEAM INJECTION; NEUTRAL PARTICLES; PLASMA; PLASMA SIMULATION; THERMONUCLEAR REACTORS