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Takayanagi, Tomohiro; Kamiya, Junichiro; Watanabe, Masao; Ueno, Tomoaki*; Yamazaki, Yoshishige; Irie, Yoshiro; Kishiro, Junichi; Sakai, Izumi*; Kawakubo, Toshimichi*; Tounosu, Shigeki*; et al.
IEEE Transactions on Applied Superconductivity, 16(2), p.1366 - 1369, 2006/06
Times Cited Count:8 Percentile:43.37(Engineering, Electrical & Electronic)The injection system of the 3-GeV RCS in J-PARC is composed of four main orbit bump magnets (shift bump) to merge the injection beam with the circulating beam. The magnetic field design and the structural analysis of the shift bump magnets have been performed using 3D magnetic and mechanical codes. In this paper, the design of the bending magnets is reported.
Takayanagi, Tomohiro; Kamiya, Junichiro; Watanabe, Masao; Yamazaki, Yoshishige; Irie, Yoshiro; Kishiro, Junichi; Sakai, Izumi*; Kawakubo, Toshimichi*
IEEE Transactions on Applied Superconductivity, 16(2), p.1358 - 1361, 2006/06
Times Cited Count:17 Percentile:60.42(Engineering, Electrical & Electronic)The injection bump system of the 3-GeV RCS in J-PARC consists of the pulse bending magnets for the injection bump orbit, which are four horizontal bending magnets (shift bump), four horizontal painting magnets (h-paint bump), and two vertical painting magnets (v-paint bump). In this paper, the design of the magnets and power supply of the injection bump system are reported.
Hotchi, Hideaki; Noda, Fumiaki*; Tani, Norio; Kishiro, Junichi*; Machida, Shinji*; Molodojentsev, A. Y.*
Proceedings of 2005 Particle Accelerator Conference (PAC '05) (CD-ROM), p.916 - 918, 2005/00
no abstracts in English
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.
Noda, Fumiaki*; Hotchi, Hideaki; Saha, P. K.; Shobuda, Yoshihiro; Yamamoto, Kazami; Hayashi, Naoki; Kishiro, Junichi; Machida, Shinji*; Molodojentsev, A. Y.*
Proceedings of 2005 Particle Accelerator Conference (PAC '05) (CD-ROM), p.2759 - 2761, 2005/00
no abstracts in English
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.
Tani, Norio; Adachi, Toshikazu*; Someya, Hirohiko*; Watanabe, Yasuhiro; Sato, Hikaru*; Kishiro, Junichi
IEEE Transactions on Applied Superconductivity, 14(2), p.421 - 424, 2004/06
Times Cited Count:14 Percentile:56.19The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project (J-PARC) is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400-MeV to 3-GeV at a repetition rate of 25-Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a larger fringe field at a pole end than a usual synchrotron magnet. In addition, 25-Hz ac field induces an eddy current in magnet components, magnet end plates and etc. The eddy current induced in the end plates is expected to be large. Therefore, it is important to investigate an effect of large leakage field and eddy current to the beam motion around the magnet end part. We have measured the eddy loss and the eddy field at the edges of the dipole and quadrupole magnets. In this paper, we report the comparison between the results of the measurements and the two-dimensional eddy current model developed for this study.
Tani, Norio; Adachi, Toshikazu*; Igarashi, Susumu*; Watanabe, Yasuhiro; Someya, Hirohiko*; Sato, Hikaru*; Kishiro, Junichi
IEEE Transactions on Applied Superconductivity, 14(2), p.409 - 412, 2004/06
Times Cited Count:18 Percentile:62.60The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project (J-PARC) is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400-MeV to 3-GeV at a repetition rate of 25-Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. It also works as an injector for a 50-GeV synchrotron. The 3-GeV synchrotron consists of 24 dipole magnets, 60 quadrupole magnets, 18 sextupole magnets and 52 steering magnets. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a larger fringe field at a pole end than a usual synchrotron magnet. Therefore, it is important to estimate the magnetic field and the effect of multipole component at the fringe field. In this paper, we report the results of the field calculation and mechanical design of RCS magnets.
Maebara, Sunao; Zheng, X.*; Watanabe, Akihiko*; Kishiro, Junichi*; Takayama, Ken*; Horioka, Kazuhiko*; Ogawa, Masao*; Kawasaki, Sunao*; Shiho, Makoto
JAERI-Research 2004-007, 40 Pages, 2004/03
no abstracts in English
Sato, Susumu; Igarashi, Zenei*; Lee, S.*; Tomisawa, Tetsuo; Hiroki, Fumio; Kishiro, Junichi; Ikegami, Masanori*; Kondo, Yasuhiro; Hasegawa, Kazuo; Ueno, Akira; et al.
Proceedings of 22nd International Linear Accelerator Conference (LINAC 2004), p.429 - 431, 2004/00
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 at Tokai, Japan. For this accelerator, it is required to minimize the beam loss (typically, lower than 0.11 W/m at the linac). To achieve the requirement, beam trajectory needs to be controlled with accuracy of some 100 micro-meter. 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 strip-line 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.
Morimoto, Iwao; Zheng, X. D.*; Maebara, Sunao; Kishiro, Junichi*; Takayama, Ken*; Horioka, Kazuhiko*; Ishizuka, Hiroshi*; Kawasaki, Sunao*; Shiho, Makoto
Nuclear Instruments and Methods in Physics Research A, 475(1-3), p.509 - 513, 2001/12
Times Cited Count:0 Percentile:0.00(Instruments & Instrumentation)no abstracts in English
Morimoto, Iwao; Kishiro, Junichi*; Takayama, Ken*; Zheng, X.; Maebara, Sunao; Shiho, Makoto
JAERI-Research 2000-008, p.59 - 0, 2000/02
no abstracts in English
Maebara, Sunao; Morimoto, Iwao*; Zheng, X.*; Kishiro, Junichi*; Takayama, Ken*; Horioka, Kazuhiko*; Kawasaki, Sunao*; Ishizuka, Hiroshi*; Shiho, Makoto
Proceedings of 13th International Conference on High-Power Particle Beams (BEAMS 2000) (CD-ROM), 4 Pages, 2000/00
no abstracts in English
Shiho, Makoto; Zheng, X.*; Morimoto, Iwao*; Maebara, Sunao; Minami, Kazuo*; Kishiro, Junichi*; Kawasaki, Sunao*
Proceedings of 13th International Conference on High-Power Particle Beams (BEAMS 2000) (CD-ROM), 4 Pages, 2000/00
no abstracts in English
Maebara, Sunao; Morimoto, Iwao*; Zheng, X.; Kishiro, Junichi*; Takayama, Ken*; Kawasaki, Sunao*; Shiho, Makoto
Shingaku Giho, 99(498), p.63 - 66, 1999/12
no abstracts in English