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Title: Progress in the development of an H{sup −} ion source for cyclotrons

A multi-cusp DC H{sup −} ion source has been developed for cyclotrons in medical use. Beam optics of the H{sup −} ion beam is studied using a 2D beam trajectory code. The simulation results are compared with the experimental results obtained in the Mark I source, which has produced up to 16 mA H{sup −} ion beams. The optimum extraction voltages show good agreement between the calculation and the experimental results. A new ion source, Mark II source, is designed to achieve the next goal of producing an H{sup −} beam of 20 mA. The magnetic field configurations and the plasma electrode design are optimized for Cs-seeded operation. Primary electron trajectory simulation shows that primary electrons are confined well and the magnetic filter prevents the primary electrons from entering into the extraction region.
Authors:
; ; ; ; ; ; ;  [1] ;  [2]
  1. Sumitomo Heavy Industries, Ltd., Tokyo (Japan)
  2. Fusion Research and Development Directorate, Japan Atomic Energy Agency, Aomori (Japan)
Publication Date:
OSTI Identifier:
22391422
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:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAM OPTICS; BEAM PRODUCTION; CESIUM; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; CUSPED GEOMETRIES; CYCLOTRONS; DESIGN; ELECTRIC POTENTIAL; ELECTRODES; ELECTRONS; HYDROGEN IONS 1 MINUS; ION BEAMS; ION SOURCES; MAGNETIC FILTERS; OPERATION; PLASMA