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Journal Articles

Design of the injection bump system of the 3-GeV RCS in J-PARC

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:16 Percentile:60.98(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.

Journal Articles

Design of the shift bump magnets for the beam injection of the 3-GeV RCS in J-PARC

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:43.82(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.

Journal Articles

Evaluation of nonlinear effects in the 3-GeV rapid cycling synchrotron of J-PARC

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

Journal Articles

The Status of optics design and beam dynamics study in J-PARC RCS

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

Journal Articles

Development of the beam diagnostics system for the J-PARC rapid-cycling synchrotron

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.

Journal Articles

Design of 4-stripline beam position monitors of the J-PARC linac SDTL

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.

Journal Articles

Systematic calibration of beam position monitor at J-PARC LINAC

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 than0.1$$sim$$1 W/m at the linac). To achieve the requirement, beam trajectory needs to be controlled with accuracy of some 100 $$mu$$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.

Journal Articles

Design of RCS magnets for J-PARC 3-GeV synchrotron

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:17 Percentile:61.6(Engineering, Electrical & Electronic)

The 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.

Journal Articles

Eddy current effect of magnets for J-PARC 3-GeV synchrotron

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:12 Percentile:54.69(Engineering, Electrical & Electronic)

The 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.

JAEA Reports

Research and development of large current induction linac

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

JAERI-Research-2004-007.pdf:4.48MB

no abstracts in English

Journal Articles

Systematic calibration of beam position monitor in the high intensity proton accelerator (J-PARC) linac

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 0.1$$sim$$1 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.

Journal Articles

Beam monitor for J-PARC linac accelerator

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.

Journal Articles

Direct observation of beam bunching in BWO experiments

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:0.01(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

Beam transport study of kA-class on the induction linac

Morimoto, Iwao; Kishiro, Junichi*; Takayama, Ken*; Zheng, X.; Maebara, Sunao; Shiho, Makoto

JAERI-Research 2000-008, p.59 - 0, 2000/02

JAERI-Research-2000-008.pdf:3.83MB

no abstracts in English

Journal Articles

Beam transport experiment in JLA induction linac for a mm-meter wave FEL

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

Journal Articles

200MW reletivistic backward-wave oscillator

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

Journal Articles

Design of 9.4GHz focusing wiggler

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

Journal Articles

A corrugated waveguide driven by the linac as a prebuncher and seed-power generator of mm-wave FEL

X.D.Zheng*; ; Maebara, Sunao; *; ; *; Yakayama, Ken*; *; *; Ogawa, Masao*; et al.

Nuclear Instruments and Methods in Physics Research A, 407(1-3), p.198 - 202, 1998/00

 Times Cited Count:1 Percentile:22.18(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Lightning control system using high power microwave FEL

; *; Kawasaki, S.*; Ishizuka, H.*; *; *; *; *

Nuclear Instruments and Methods in Physics Research A, 375(1-3), p.396 - 400, 1996/00

 Times Cited Count:4 Percentile:43.42(Instruments & Instrumentation)

no abstracts in English

19 (Records 1-19 displayed on this page)
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