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Title: Optimum plasma grid bias for a negative hydrogen ion source operation with Cs

The functions of a biased plasma grid of a negative hydrogen (H{sup −}) ion source for both pure volume and Cs seeded operations are reexamined. Proper control of the plasma grid bias in pure volume sources yields: enhancement of the extracted negative ion current, reduction of the co-extracted electron current, flattening of the spatial distribution of plasma potential across the filter magnetic field, change in recycling from hydrogen atomic/molecular ions to atomic/molecular neutrals, and enhanced concentration of H{sup −} ions near the plasma grid. These functions are maintained in the sources seeded with Cs with additional direct emission of negative ions under positive ion and neutral hydrogen bombardment onto the plasma electrode.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. UPMC, LPP, Ecole Polytechnique, UMR CNRS 7648, Palaiseau (France)
  2. R&D Promotion Organization, Doshisha University, Kamigyoku, Kyoto 602-8580 (Japan)
  3. School of Science and Engineering, Doshisha University, Kyotonabe, Kyoto 610-0321 (Japan)
  4. CCFE, Culham Science Center, Abingdon, Oxfordshire 0X14 3DB (United Kingdom)
Publication Date:
OSTI Identifier:
22482952
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CURRENTS; GRIDS; HYDROGEN IONS 1 MINUS; MOLECULAR IONS; PLASMA; PLASMA POTENTIAL; SPATIAL DISTRIBUTION