Effect of high energy electrons on H⁻ 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-...

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Bibliographic Details
Published in:Review of scientific instruments 2016-02, Vol.87 (2), p.02B127-02B127
Main Authors: Onai, M, Etoh, H, Aoki, Y, Shibata, T, Mattei, S, Fujita, S, Hatayama, A, Lettry, J
Format: Article
Language:English
Subjects:
ANIONS
CURRENTS
CYCLOTRONS
Dependence
Discharge
Distribution functions
Electric arcs
Electron energy distribution
ELECTRONS
ENERGY SPECTRA
FILAMENTS
High energy electrons
HYDROGEN
Hydrogen storage
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Ions
Mathematical models
MOLECULES
Negative ions
PLASMA
Plasmas (physics)
PROTONS
REACTION KINETICS
Scientific apparatus & instruments
SIMULATION
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Summary: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(-) production. The modelling results reasonably explains the dependence of the H(-) extraction current on the arc-discharge power in the experiments.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4934846