TY - JOUR
T1 - High current DC negative ion source for cyclotron
AU - Etoh, H.
AU - Onai, M.
AU - Aoki, Y.
AU - Mitsubori, H.
AU - Arakawa, Y.
AU - Sakuraba, J.
AU - Kato, T.
AU - Mitsumoto, T.
AU - Hiasa, T.
AU - Yajima, S.
AU - Shibata, T.
AU - Hatayama, A.
AU - Okumura, Y.
N1 - Publisher Copyright:
© 2015 AIP Publishing LLC.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/84947939674
UR - https://www.scopus.com/pages/publications/84947939674#tab=citedBy
U2 - 10.1063/1.4934613
DO - 10.1063/1.4934613
M3 - Article
C2 - 26932017
AN - SCOPUS:84947939674
SN - 0034-6748
VL - 87
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 2
M1 - 02B135
ER -