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ion sourceOguri, Hidetomo; Okoshi, Kiyonori; Shinto, Katsuhiro; Shibata, Takanori*; Nammo, Kesao*; Ikegami, Kiyoshi*; Takagi, Akira*; Ueno, Akira
JPS Conference Proceedings (Internet), 33, p.011008_1 - 011008_7, 2021/03
A cesiated RF-driven negative hydrogen ion source was initiated to operate in September, 2014 in response to the need for upgrading J-PARC's linac beam current. The ion source mainly comprises a stainless-steel plasma chamber, a beam extractor and a large vacuum chamber equipped with two turbo molecular pumps, each having the pumping speed of 1500 L/s, for differential pumping. The user operation was started with the beam current of 33 mA from the ion source. We gradually increased both beam current and continuous operation time of the ion source. In July, 2018 (Run#79), approximately 2,200 hours operation was achieved with the typical beam current, pulse length and repetition rate of 47 mA, 300 
s and 25 Hz, respectively. Since October, 2018 (Run#80), the ion source has been delivering a nominal beam current of approximately 60 mA.
Oguri, Hidetomo; Okoshi, Kiyonori; Ikegami, Kiyoshi*; Yamazaki, Saishun; Takagi, Akira*; Koizumi, Isao; Ueno, Akira
JPS Conference Proceedings (Internet), 8, p.011009_1 - 011009_6, 2015/09
Yamazaki, Yoshishige
Proceedings of 9th European Particle Accelerator Conference (EPAC 2004), p.1351 - 1353, 2004/00
The J-PARC (Japan Proton Accelerator Research Complex) is under construction in JAERI Tokai site. The beam commissioning will start there by the end of 2006. Prior to this, the front end of the linac was beam-commissioned in 2003 at KEK. The negative hydrogen beam with a peak current of 30 mA was accelerated up to 20 MeV by the first tank of the three DTL's following the 3-MeV RFQ linac. The 324-MHz DTL contains the electro quadrupole magnets with water-cooling channels specially fabricated by means of electroforming and wire-cutting technologies. The construction status of the J-PARC accelerator is also presented.
; Okumura, Yoshikazu; Miyamoto, Naoki*; Kusano, Joichi; Mizumoto, Motoharu
Review of Scientific Instruments, 67(3), p.1051 - 1053, 1996/03
Times Cited Count：1 Percentile：23.44(Instruments & Instrumentation)no abstracts in English
Shinto, Katsuhiro*; Okumura, Yoshikazu; ; Wada, Motoi*; ; Inoue, Takashi; Miyamoto, Kenji; Nagase, Akihito*
Japanese Journal of Applied Physics, 35(3), p.1894 - 1900, 1996/00
Times Cited Count：20 Percentile：67.93(Physics, Applied)no abstracts in English
Ion Source for Neutral Beam Injector; Ohara, Yoshihiro; ;
JAERI-M 84-098, 23 Pages, 1984/05
no abstracts in English
Arakawa, Kazuo; Sugiura, Toshio
Shitsuryo Bunseki, 31(4), p.251 - 257, 1983/00
no abstracts in English
