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Title: High current DC negative ion source for cyclotron

A filament driven multi-cusp negative ion source has been developed for proton cyclotrons in medical applications. In Cs-free operation, continuous H{sup −} beam of 10 mA and D{sup −} beam of 3.3 mA were obtained stably at an arc-discharge power of 3 kW and 2.4 kW, respectively. In Cs-seeded operation, H{sup −} beam current reached 22 mA at a lower arc power of 2.6 kW with less co-extracted electron current. The optimum gas flow rate, which gives the highest H{sup −} current, was 15 sccm in the Cs-free operation, while it decreased to 4 sccm in the Cs-seeded operation. The relationship between H{sup −} production and the design/operating parameters has been also investigated by a numerical study with KEIO-MARC code, which gives a reasonable explanation to the experimental results of the H{sup −} current dependence on the arc power.
Authors:
; ; ; ; ; ; ; ;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Sumitomo Heavy Industries, Ltd., Tokyo 141-6025 (Japan)
  2. Graduate School of Science and Technology, Keio University, Kanagawa 223-8522 (Japan)
  3. High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801 (Japan)
  4. Fusion Research and Development Directorate, Japan Atomic Energy Agency, Aomori 039-3212 (Japan)
Publication Date:
OSTI Identifier:
22482955
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; BEAM CURRENTS; CYCLOTRONS; DESIGN; DEUTERON BEAMS; FILAMENTS; GAS FLOW; NUMERICAL ANALYSIS; OPERATION; PROTONS