### 抜粋

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.

元の言語 | English |
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記事番号 | 02B135 |

ジャーナル | Review of Scientific Instruments |

巻 | 87 |

発行部数 | 2 |

DOI | |

出版物ステータス | Published - 2016 2 1 |

### フィンガープリント

### ASJC Scopus subject areas

- Instrumentation

### これを引用

*Review of Scientific Instruments*,

*87*(2), [02B135]. https://doi.org/10.1063/1.4934613