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

Journal Article · Mon Feb 15 04:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4934846· OSTI ID:22482947

Fujita, S.; Hatayama, A. ^[1]; Etoh, H.; Aoki, Y. ^[2]; Shibata, T. ^[3]; Mattei, S.; Lettry, J. ^[4]

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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)

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.

• OSTI ID: 22482947
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 2 Vol. 87; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANIONS
CURRENTS
CYCLOTRONS
ELECTRONS
ENERGY SPECTRA
FILAMENTS
HYDROGEN
MOLECULES
PLASMA
PROTONS
REACTION KINETICS
SIMULATION