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Hayashi, Naoki; Hatakeyama, Shuichiro; Miura, Akihiko; Yoshimoto, Masahiro; Futatsukawa, Kenta*; Miyao, Tomoaki*
Proceedings of 7th International Beam Instrumentation Conference (IBIC 2018) (Internet), p.219 - 223, 2019/01
J-PARC is a multi-purpose facility. Accelerator stability is the one of important issues for users of this facility. To realize stable operation, we must collect data on interlocked events and analyze these data to determine the reasons for the occurrence of such events. In J-PARC Linac, data of interlocked events have been recorded using several some beam loss monitors and current monitors, and these data have been are analyzed and classified. In J-PARC RCS, new instrumentation is being introduced to obtain beam position. We discuss the present status and future plans related to this subject.
Hayashi, Naoki; Kato, Yuko; Miura, Akihiko; Futatsukawa, Kenta*; Miyao, Tomoaki*
Proceedings of 5th International Beam Instrumentation Conference (IBIC 2016) (Internet), p.368 - 371, 2017/03
It is important to understand why the beam loss occurs during user operation. It is understandable that the beam loss results from RF cavities failure. However, it would be still useful to study the beam loss detailed mechanism and to know which beam loss monitor (BLM) experiences the highest loss or is most sensitive. This may lead a reduction in the number of interlocked events and a more stable accelerator operation. The J-PARC Linac BLM has a simple data recorder that comprises multiple oscilloscopes. Although its functionality is limited, it can record events when an interlock is triggered. Of particular interest here are the events associated with only the BLM Machine Protection System (MPS). These may reveal hidden problems with the accelerator.
Yamaguchi, Mitsutaka; Torikai, Kota*; Kawachi, Naoki; Shimada, Hirofumi*; Sato, Takahiro; Nagao, Yuto; Fujimaki, Shu; Kokubun, Motohide*; Watanabe, Shin*; Takahashi, Tadayuki*; et al.
Physics in Medicine & Biology, 61(9), p.3638 - 3644, 2016/05
Times Cited Count：9 Percentile：100(Engineering, Biomedical)no abstracts in English
Yamaguchi, Mitsutaka; Nagao, Yuto; Kawachi, Naoki; Sato, Takahiro; Fujimaki, Shu; Kamiya, Tomihiro; Torikai, Kota*; Shimada, Hirofumi*; Sugai, Hiroyuki*; Sakai, Makoto*; et al.
International Journal of PIXE, 26(1&2), p.61 - 72, 2016/00
no abstracts in English
Yoshimoto, Masahiro; Harada, Hiroyuki; Okabe, Kota; Kinsho, Michikazu
Proceedings of 54th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High Brightness and High Power Hadron Beams (HB 2014) (Internet), p.143 - 147, 2015/03
Transverse beam halo is one of the most important beam parameters due to limit the performance of the high intensity beam accelerator. Therefore the transverse beam halo measurement is required to increase the beam power of the J-PARC 3-GeV RCS. In the beam profile, there are the beam core which is a high density area, the beam tail which is a low density area around the beam core, and the beam halo which is the area outside of the beam tail and in which few particles are straggling. Generally, the beam halo intensity is less than 1/100000 
1/1000000 of the beam core. Therefore, the dynamic range of the beam halo is required typically an order of 10
, but it is difficult to achieve this ultra wide dynamic range by any one diagnostics. Then, new beam halo monitor, which is combined a wire type beam scraper and some beam loss monitors, are developed and installed in the extraction beam transport line. Each beam loss monitor has not more than 10
order of the dynamic range. However, to use some beam loss monitors with a plurality of different sensitivity range, its ultra wide dynamic range can be achieved and beam profile including both of the beam core, beam tail, and beam halo can be obtained.
Hatakeyama, Shuichiro; Yoshimoto, Masahiro
Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.703 - 705, 2014/10
The J-PARC LINAC introduced ACS (Annular-ring Coupled Structure) cavity and now available the 400 MeV beam extraction. As for the RCS (Rapid Cycling Synchrotron) the power supply of the injection magnets were replaced those can acceptable the 400 MeV beam injection. Because there occured many troubles of equipments in the early phase of the beam study, we desired to shorten the measurement time of the beam monitor to determine the parameters. In this report it is described the signal processing system of MWPM (Multi-wire profile monitor) which is used to measure the injection beam profile for better accuracy and shorter measurement time.
Hayashi, Naoki; Hiroki, Seiji; Kishiro, Junichi*; Teruyama, Yuzo*; Toyokawa, Ryoji; Arakawa, Dai*; Lee, S.*; Miura, Takako*; Toyama, Takeshi*
Proceedings of 2005 Particle Accelerator Conference (PAC '05) (CD-ROM), p.299 - 301, 2005/00
Development of the beam diagnostics system for the J-PARC (Japan Proton Accelerator Research Complex) Rapid-Cycling Synchrotron is described. The system consists of Beam Position Monitor (BPM), Beam Loss Monitor (BLM), Current monitors (DCCT, SCT, MCT, FCT, WCM), Tune meter system, 324MHz-BPM, Profile monitor, and Halo monitor. BPM electrode is electro-static type and its electronics is designed for both COD and turn-by-turn measurements. Five current monitors have different time constants in order to cover wide frequency range. The tune meter is consisted of RFKO and the beam pick-up electrode. For the continuous injected beam monitoring, 324MHz-BPM detects Linac frequency. Two types of profile monitor are multi-wire for low intensity tuning and the residual gas monitor for non-destructive measurement.
Tomisawa, Tetsuo; Kishiro, Junichi; Hiroki, Fumio; Sato, Susumu; Igarashi, Zenei*; Lee, S.*; Nigorikawa, Kazuyuki*; Toyama, Takeshi*
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.165 - 167, 2004/08
It proceeds with the beam monitor production of the beam diagnosis system with J-PARC. In this paper, the present status of beam position monitors (BPM) for the SDTL is described. The impedance of strip line monitor have been adjusted in the construction of housing and electrodes of the BPM. The 4-stripline BPM has already been examined in the medium energy beam transport (MEBT) line. Preliminary results of beam position measurement for various beam conditions are reported.
Sato, Susumu; Tomisawa, Tetsuo; Hiroki, Fumio; Lee, S.*; Igarashi, Zenei*; Ikegami, Masanori*; Ueno, Akira; Kondo, Yasuhiro; Hasegawa, Kazuo; Toyama, Takeshi*; et al.
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.467 - 469, 2004/08
As a joint project of KEK and JAERI, a MW class of high intensity proton accelerator (J-PARC), consisting of Linac, 3 GeV-RCS, 50 GeV-MR, is under construction. For this accelerator, it is required to minimize the beam loss (typically, lower than0.11 W/m at the linac). To achieve the requirement, beam trajectory needs to be controlled with accuracy of some 100 
m. The first stage of the acceleration (up to 181 MeV during the first stage of construction) is done by linac. The beam position monitor (BPM) in the linac utilizes 4 stripline pickups (50 ohm) on the beam transportation chamber. In this paper, systematic calibration of the BPM is described.
Tomisawa, Tetsuo; Kishiro, Junichi; Igarashi, Zenei*; Lee, S.*; Hiroki, Fumio
Proceedings of 28th Linear Accelerator Meeting in Japan, p.428 - 430, 2003/08
It is an important factor whether to have a beam loss held how, and the part of the beam diagnosis is important with the accurate beam transport, the occurrence of the high quality beam to accelerate a high intensity proton beam to handle with J-PARC linac accelerator safely. It responds to the purpose, and the beam monitor used for this beam diagnosis has it variously. There are an electric current monitor, a phase monitor, a beam position monitor, a profile monitor, a beam size monitor, a screen monitor, a beam loss monitor, and so on. Report it about these beam monitors in the present condition.
; *; *; *; *; *; *; *; *; *
Proc. of the 20th Linear Accelerator Meeting in Japan, 0, p.239 - 241, 1995/00
no abstracts in English
Yonehara, Hiroto; Suzuki, Hiromitsu; ; *; *; *; *; *; Yokomizo, Hideaki
Proc. of the 1993 Particle Accelerator Conf., 0, p.2039 - 2041, 1993/00
no abstracts in English
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JAERI-M 82-209, 18 Pages, 1982/12
no abstracts in English
; Oga, Tokumichi; ;
JAERI-M 8778, 14 Pages, 1980/03
no abstracts in English
JAERI-M 7534, 10 Pages, 1978/02
no abstracts in English
Yamaguchi, Mitsutaka; Nagao, Yuto; Saito, Yuichi; Kawachi, Naoki; Fujimaki, Shu; Yamamoto, Seiichi*; Komori, Masataka*; Toshito, Toshiyuki*
no journal, ,
no abstracts in English
Sugai, Hiroyuki*; Yamaguchi, Mitsutaka; Nagao, Yuto; Hirano, Yoshiyuki*; Sakai, Makoto*
no journal, ,
no abstracts in English
Yamaguchi, Mitsutaka; Nagao, Yuto; Kawachi, Naoki; Fujimaki, Shu; Kamiya, Tomihiro; Torikai, Kota*; Shimada, Hirofumi*; Sugai, Hiroyuki*; Sakai, Makoto*; Arakawa, Kazuo*; et al.
no journal, ,
no abstracts in English
Yamaguchi, Mitsutaka; Nagao, Yuto; Sugai, Hiroyuki*; Sakai, Makoto*; Kawachi, Naoki; Sato, Takahiro; Kamiya, Tomihiro; Fujimaki, Shu; Arakawa, Kazuo*; Narumi, Kazumasa
no journal, ,
no abstracts in English
