Masanobu Yamamoto

J-PARC linac and RCS – operational status and upgrade plan to 2 MW

Kazami Yamamoto, Katsuhiro Moriya, Hidefumi Okita, Ippei Yamada et autres

The linac and the 3 GeV rapid-cycling synchrotron (RCS) at the Japan Proton Accelerator Research Complex (J-PARC) were designed to provide 1-MW proton beams to the following facilities. Due to the improvement of the accelerator system, we accelerated a 1-MW beam with …

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Improvement of the longitudinal phase space tomography at the J-PARC synchrotrons

Hidefumi Okita, Fumihiko Tamura, Masanobu Yamamoto, Masaharu Nomura et autres

Abstract The longitudinal phase space tomography, which reconstructs the phase space distribution from the one-dimensional bunch profiles, is used in various accelerators to measure longitudinal beam parameters. At the J-PARC, an implementation of the phase space tomography based on the Convolution Back …

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Development of a single-ended magnetic alloy loaded cavity in the Japan Proton Accelerator Research Complex rapid cycling synchrotron

Masanobu Yamamoto, Masahiro Nomura, Hidefumi Okita, Taihei Shimada et autres

Abstract The Japan Proton Accelerator Research Complex (J-PARC) Rapid Cycling Synchrotron (RCS) employs magnetic alloy (MA) loaded cavities. We realize multi-harmonic rf driving and beam-loading compensation owing to the broadband characteristics of the MA. The currently installed cavity is the conventional type, …

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Demonstration of a kicker impedance reduction scheme with diode stack and resistors by operating the 3-GeV rapid cycling synchrotron of the Japan Proton Accelerator Research Complex

Yoshihiro Shobuda, Hiroyuki Harada, Pranab Kumar Saha, T. Takayanagi et autres

At the Rapid Cycling Synchrotron (RCS) in Japan Proton Accelerator Research Complex (J-PARC), theoretical predictions have indicated that the kicker impedance would excite the beam instability.A 1-MW beam with large emittance can be delivered to the Material and Life Science Experimental Facility …

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Design of VHF System in J-PARC Main Ring

Yuichi Morita, K. Hasegawa, Yasuyuki Sugiyama, Masanobu Yamamoto et autres

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Operation Experience of Tetrode Vacuum Tubes in J-PARC Ring RF System

Masanobu Yamamoto, Masashi Furusawa, Keigo Hara, K. Hasegawa et autres

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1.2-MW-Equivalent High-Intensity Beam Tests in J-PARC RCS

H. Hotchi, Hiroyuki Harada, Naoki Hayashi, Michikazu Kinsho et autres

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J-PARC 3-GeV RCS: 1-MW beam operation and beyond

H. Hotchi, Hiroyuki Harada, Naoki Hayashi, Michikazu Kinsho et autres

The J-PARC 3-GeV rapid cycling synchrotron (RCS) has recently achieved a 1-MW beam operation with considerably low fractional beam loss of a couple of 10 −3 as a result of continuous efforts iterating experiments and numerical simulations. This success of the 1-MW …

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Reduction of the Kicker Impedance Maintaining the Performance of Present Kicker Magnet at RCS in J-PARC

Yoshihiro Shobuda, Y. Irie, T. Takayanagi, T. Togashi et autres

The present four-terminal kicker at the Rapid Cycling Synchrotron (RCS) at the Japan Proton Accelerator Research Complex (J-PARC) has the power-saving benefit due to the doubled excitation currents by shorting two-terminals. On the other hand, beam instabilities are excited by the kicker …

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Path to 1-MW at J-PARC Rapid Cycling Synchrotron

Kazami Yamamoto, Masanobu Yamamoto, Takatoshi Morishita, Hiroyuki Harada et autres

The accelerator system at Japan Proton Accelerator Research Complex (J-PARC) has been operational since May 2008 and has mainly been used to perform physics experiments. The accelerator system consists of a Linac, a Rapid Cycling Synchrotron (RCS), and a Main Ring Synchrotron. …

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Upgrade of MW-class anode power supply for J-PARC RCS

Katsuhiko Ueki, Isamu Tominaga, Chihiro Hasegawa, Choji Yamazaki et autres

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Longitudinal Particle Tracking Code for a High Intensity Proton Synchrotron

Masanobu Yamamoto

We have been developing a longitudinal particle tracking code to design and investigate the beam behavior of the J-PARC proton synchrotrons. The code calculate the longitudinal particle motion with a wake voltage and a space charge effect. The most different point from …

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