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Kikuzawa, Nobuhiro; Niki, Kazuaki*; Yamamoto, Noboru*; Hayashi, Naoki; Adachi, Masatoshi*; Watanabe, Kazuhiko*
Proceedings of 16th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.877 - 880, 2019/07
Interlock system of J-PARC is classified into a personnel protection system (PPS) for human safety and a machine protection system (MPS) for protecting equipment. The PPS of the J-PARC accelerator started from the operation at Linac in 2006 and was completed by the MR operation in 2008. In the next 10 years, some improvements have been made, such as updating video monitoring systems and establishing new interlocks. In addition to describing recent operations including these updatings, this paper reports the current status of inspections and maintenance conducted to maintain and improve reliability.
Okada, Masashi*; Niki, Kazuaki*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Ishiyama, Hironobu*; Jeong, S. C.*; Katayama, Ichiro*; Miyatake, Hiroari*; Oyaizu, Mitsuhiro*; Watanabe, Yutaka*; et al.
Physical Review Special Topics; Accelerators and Beams, 15(3), p.030101_1 - 030101_10, 2012/03
Times Cited Count：5 Percentile：33.45(Physics, Nuclear)Osa, Akihiko; Abe, Shinichi; Asozu, Takuhiro; Hanashima, Susumu; Ishii, Tetsuro; Ishizaki, Nobuhiro; Kabumoto, Hiroshi; Kutsukake, Kenichi; Matsuda, Makoto; Nakamura, Masahiko; et al.
no journal, ,
At JAEA-tandem accelerator facility, we can produce radioactive nuclei by means of proton induced uranium fission, heavy ion fusion or transfer reaction. Since TRIAC was opened for use in 2005, we have provided RNBs of fission products and 
Li. For the production of Li, we chose 
C (
Li, Li) neutron transfer reaction by Li primary beam and a 99% enriched C sintered disk target. The release time of Li ions from the C sintered target/ion source system was measured to be 3.2 s. We are developing the RNB of 
Li (T
=178 ms) but the long release time caused a significant loss of the beam intensity. A boron nitride target which has fast release of Li is developed for Li beam with intensity of 10
pps after separation by JAEA-ISOL.
beams for measurement of 
C(
) reactionNiki, Kazuaki*; Arai, Shigeaki*; Ishiyama, Hironobu*; Okada, Masayuki*; Makii, Hiroyuki; Miyatake, Hiroari; Watanabe, Yutaka*
no journal, ,
no abstracts in English
Okada, Masashi*; Ishiyama, Hironobu*; Katayama, Ichiro*; Miyatake, Hiroari*; Niki, Kazuaki*; Watanabe, Yutaka*; Makii, Hiroyuki; Arai, Shigeaki*
no journal, ,
Niki, Kazuaki*; Ishiyama, Hironobu*; Katayama, Ichiro*; Miyatake, Hiroari*; Okada, Masashi*; Watanabe, Yutaka*; Makii, Hiroyuki; Arai, Shigeaki*
no journal, ,
Okada, Masashi*; Ishiyama, Hironobu*; Katayama, Ichiro*; Niki, Kazuaki*; Miyatake, Hiroari*; Watanabe, Yutaka*; Makii, Hiroyuki; Arai, Shigeaki*
no journal, ,
no abstracts in English
C(,
)
O reaction at TRIACMakii, Hiroyuki; Miyatake, Hiroari*; Wakabayashi, Yasuo; Ishiyama, Hironobu*; Niki, Kazuaki*; Okada, Masashi*; Imai, Nobuaki*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Jeong, S. C.*; et al.
no journal, ,
The C(,)O reaction plays an important role in stellar evolution at the stage of helium-burning. Its reaction rate determines the mass fraction of C and O, the abundance distribution of the elements between oxygen and iron, and the iron-core mass before the super-nova explosion. However, the cross section at low energy still has a large uncertainty mainly due to the poor determination of the ratio of E2 cross section to E1 one. In order to provide a stringent constraint to extrapolation down to stellar temperature, additional data is crucial. Hence we designed new measurement at TRIAC (Tokai Radioactive Ion Accelerator Complex). With use of the 18 GHz ECR (electron cyclotron resonance) ion source set upstream of the TRIAC accelerators, TRIAC has a possibility to deliver intense -beams. By using the pulsed alpha-beams provide by TRIAC, the high efficiency anti-Compton NaI(Tl) spectrometers, and enriched carbon targets (99.99 % enrichment in C), we measured the -ray spectrum of the C(,)O reaction near the resonance at a center of mass energy of 2.4 MeV. In this contribution, we will discuss obtained E1 and E2 cross sections of the reaction.
