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(-) beam of 10 mA and D(-) 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(-)...

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Bibliographic Details
Published in:Review of scientific instruments 2016-02, Vol.87 (2), p.02B135-02B135
Main Authors: Etoh, H, Onai, M, Aoki, Y, Mitsubori, H, Arakawa, Y, Sakuraba, J, Kato, T, Mitsumoto, T, Hiasa, T, Yajima, S, Shibata, T, Hatayama, A, Okumura, Y
Format: Article
Language:English
Subjects:
ANIONS
BEAM CURRENTS
Cesium
CYCLOTRONS
Dependence
DESIGN
Design parameters
Deuterium
DEUTERON BEAMS
Electric arcs
FILAMENTS
Flow velocity
GAS FLOW
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Ions
Negative ions
NUMERICAL ANALYSIS
OPERATION
PROTONS
Scientific apparatus & instruments
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Summary:A filament driven multi-cusp negative ion source has been developed for proton cyclotrons in medical applications. In Cs-free operation, continuous H(-) beam of 10 mA and D(-) 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(-) 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(-) current, was 15 sccm in the Cs-free operation, while it decreased to 4 sccm in the Cs-seeded operation. The relationship between H(-) 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(-) current dependence on the arc power.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4934613