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Fuwa, Yasuhiro; Takayanagi, Tomohiro; Iwashita, Yoshihisa*
IEEE Transactions on Applied Superconductivity, 32(6), p.4006705_1 - 4006705_5, 2022/09
Times Cited Count：0 Percentile：0(Engineering, Electrical & Electronic)Space charge compensation technique using multipole magnetic field components has been proposed to transport high intensity beam in the J-PARC linac. In order to realize this compensation technique, a compact size permanent hybrid multi-pole magnet would be suitable. A magnet system for the simultaneous production of quadrupole and adjustable octupole components using permanent magnet materials and have manufactured a first model of the magnet systems.
Fuwa, Yasuhiro; Moriya, Katsuhiro; Takayanagi, Tomohiro
Proceedings of 31st International Linear Accelerator Conference (LINAC 2022) (Internet), p.364 - 367, 2022/09
MEBT1 (Medium Energy Beam Transport 1) of the J-PARC LINAC is a 3 MeV beam transport system located between the RFQ (Radio Frequency Quadrupole) and DTL (Drift Tube Linac). In the MEBT1, the beam-optical matching for injection into DLT and chopping for injection into acceleration phase of 3 GeV synchrotron, located downstream to the LINAC, are performed. The characteristics of MEBT1 are an important factor in determining the beam quality in the J-PARC accelerator facility. To achieve beam power of 1 MW and beyond, improving the stability and reliability of MEBT1 is an important development issue. The application of permanent magnets to the beam focusing system to the MEBT1 is under consideration to achieve improved stability and reliability. In this presentation, we report the design of focusing magnets using permanent magnet material and the results of the lattice study of MEBT1 with permanent magnets.
Hayashi, Naoki; Hatakeyama, Shuichiro; Fukuta, Shimpei*
Proceedings of 18th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.679 - 682, 2021/10
In order to achieve a high availability in a user facility accelerator complex, it is necessary to understand in detail not only the simple failure cause of the magnet or the acceleration cavity power supply, but also complex interlocked events. At J-PARC, not only the primary interlock information but also the data recorded by the beam diagnostic system before the interlocked event is used to carefully reconstruct the event and clarify the cause more accurately. This time, we proceeded with the analysis based on more detailed waveform of the RCS Beam Loss Monitor and the events during simultaneous operation of MLF and MR. We present various events of the beam destination switching problem, the influence of the ion source discharged, and the events related to the RCS extraction kicker.
Hayashi, Naoki
Proceedings of 17th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.478 - 481, 2020/09
Measurement of beam intensity or beam current is the one of the most important beam diagnostic in an accelerator. At J-PARC Rapid-Cycling Synchrotron (RCS), there are two kinds of beam intensity monitors and multiple Current Transformers (CT) with various bandwidth. The RCS is a high intensity proton accelerator and its designed beam power of 1 MW. The beam power delivered to users gradually increases in the recent year. Single pulse or short term with designed beam power has been also demonstrated. In addition, beyond 1-MW equivalent intensity has been attempted. Through the experience with achievement of the design goal and the operation beyond it, intensity dependence of beam current measurement has been summarized.
Mukaiyama, Takehiko
RIST News, (28), p.3 - 11, 1999/09
no abstracts in English
Mukaiyama, Takehiko; Oyama, Yukio; Mizumoto, Motoharu; Takizuka, Takakazu; Hino, Ryutaro
Proc. of Topical Meeting on Nuclear Applications of Accelerator Technology, p.398 - 404, 1997/00
no abstracts in English
Harada, Hiroyuki
no journal, ,
Recently, humankind had big discovery about neutron star, which is great big nuclear in the space. They are discovery of neutron star with twice mass of solar in 2010 and observation of gravity wave when two neutron start incorporate in 2017. Experimental researches of the neutron star by using accelerated ion beams become heated in the world. The J-PARC facility consists of 400 MeV linac, 3 GeV rapid cycling synchrotron (RCS) and 50 GeV main ring synchrotron. These accelerators provide MW class high intensity proton beams to the targets, and secondary beams after hitting the proton to the targets are used in many experiments and researches. We simulated the heavy ion beam in our J-PARC accelerators and propose the accelerator scheme of the beam in J-PARC and the intensity will reach to the world record. I will report the current status of proton beam and introduce the accelerator plan for high intensity heavy ion beam in J-PARC.
Chimura, Motoki; Yamada, Ippei; Kojima, Kunihiro
no journal, ,
no abstracts in English
