DOE OSTI · 22482955
High current DC negative ion source for cyclotron
Abstract
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.
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Aoki, Y., Mitsubori, H., Arakawa, Y., Sakuraba, J., Kato, T., Mitsumoto, T., Hiasa, T., Yajima, S., Onai, M., Hatayama, A., Shibata, T., Okumura, Y.. 2016-02-15. High current DC negative ion source for cyclotron. https://doi.org/10.1063/1.4934613
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