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Title: Effect of high energy electrons on H{sup −} production and destruction in a high current DC negative ion source for cyclotron

Recently, a filament driven multi-cusp negative ion source has been developed for proton cyclotrons in medical applications. In this study, numerical modeling of the filament arc-discharge source plasma has been done with kinetic modeling of electrons in the ion source plasmas by the multi-cusp arc-discharge code and zero dimensional rate equations for hydrogen molecules and negative ions. In this paper, main focus is placed on the effects of the arc-discharge power on the electron energy distribution function and the resultant H{sup −} production. The modelling results reasonably explains the dependence of the H{sup −} extraction current on the arc-discharge power in the experiments.
Authors:
; ;  [1] ; ;  [2] ;  [3] ; ;  [4]
  1. Faculty of Science and Technology, Keio University, Yokohama 223-8522 (Japan)
  2. Sumitomo Heavy Industries, Ltd., Tokyo 141-6025 (Japan)
  3. High Energy Accelerator Research Organization (KEK), Ibaraki (Japan)
  4. CERN Rte de Meyrin, 1200 Geneva (Switzerland)
Publication Date:
OSTI Identifier:
22482947
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:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANIONS; CURRENTS; CYCLOTRONS; ELECTRONS; ENERGY SPECTRA; FILAMENTS; HYDROGEN; MOLECULES; PLASMA; PROTONS; REACTION KINETICS; SIMULATION