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Kabumoto, Hiroshi; Takeuchi, Suehiro; Matsuda, Makoto; Nakanoya, Takamitsu
Dai-17-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.135 - 137, 2004/06
no abstracts in English
Hasegawa, Kazuo; High-intensity Proton Accelerator Linac Group
Proceedings of 28th Linear Accelerator Meeting in Japan, p.66 - 68, 2003/08
no abstracts in English
; Toyama, Shinichi; Nomura, Masahiro; Hirano, Koichiro; Yamazaki, Yoshio; Sato, Isamu
JNC TN9400 99-073, 18 Pages, 1999/08
A short traveling wave accelerator with a traveling wave resonant ring is proposed for high beam current accelerators (including the linear accelerator, circular accelerator and storage ring). It is a normal conducting accelerator. The CW beam current can be as high as 10A. Such kind of accelerator unit has large beam holes for damping all of the cavity high order modes in order to avoid the resonant buildup of the fields that would cause multibunch instabilities at high currents. It has high efficiency, high power input capability and low K
. It is called "single mode" type. Even though beams are accelerated off the crest for phase stability in circular accelerator, the cavities do not need detuning.
Takeuchi, Suehiro
Proc. of 8th Int. Conf. on Heavy Ion Accelerator Technology, p.244 - 251, 1999/00
no abstracts in English
Suzuki, Hiromitsu; *; Yonehara, Hiroto; Harami, Taikan; ; Kawashima, Yoshitaka*; *; Inoue, K.*; Hara, Masahiro*; *
Proc. of the 8th Symp. on Accelerator Science and Technology, p.113 - 115, 1991/00
no abstracts in English
Morishita, Takatoshi; Kondo, Yasuhiro; Oguri, Hidetomo; Hasegawa, Kazuo; Tamura, Jun; Hirano, Koichiro; Ito, Takashi; Nammo, Kesao*; Sugimura, Takashi*; Naito, Fujio*
no journal, ,
The J-PARC accelerator comprises an injector linac, a 3 GeV Rapid-Cycling Synchrotron (RCS) and a Main Ring. Accelerator components in the linac contain a negative hydrogen ion source, a radio-frequency quadrupole (RFQ) linac, drift tube linacs (DTLs), separated-type DTLs, and annular-ring coupled structure (ACS) linacs. Beam commissioning started in November 2006 and beam delivery to users started in 2009. The ACS cavities were installed to increase the energy to the original design of 400 MeV. The new front end (ion source, RFQ, and chopping system) was installed in 2014 to increase the peak beam current from 30 to 50 mA. Currently, a peak current of 50-mA beam is delivered to the RCS with a beam pulse width of 0.27 ms for neutron and muon experiments and 0.1 ms for particle and nuclear experiments with the repetition of 25 Hz. The progress and the operating stability of the RF cavities and measures to maintain performance will be presented.
Morishita, Takatoshi
no journal, ,
Accelerators for Accelerator Driven Systems (ADS) are required to have extremely high operational stability to reduce the fluctuations in the thermal load for the subcritical reactor by beam trips. The J-PARC linac, which is also a high-intensity proton accelerator, has been focused on improving the operational stability of the accelerator to achieve both stable beam quality and high availability. Accelerator cavities in the J-PARC linac contain an RFQ, DTLs, SDTLs, and ACS. Beam commissioning started in November 2006 and beam delivery to users started in 2008. To contribute to the development of ADS accelerators, the operating status of RF accelerator cavities in recent years, especially the RF trips that causes a beam stop, and future improvement plans are presented in this workshop. Additionally, the beam stop event such as equipment failure and the details of preventive maintenance will be reported.
