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1.
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Design Studies on a High-Power Wide-Band RF Combiner for Consolidation of the Driver Amplifier of the J-PARC RCS
/ Okita, Hidefumi (KEK, Tsukuba ; J-PARC) ; Hara, Keigo (KEK, Tsukuba ; J-PARC) ; Hasegawa, Katsushi (KEK, Tsukuba ; J-PARC) ; Nomura, Masahiro (KEK, Tsukuba ; J-PARC) ; Ohmori, Chihiro (KEK, Tsukuba ; J-PARC) ; Paoluzzi, Mauro (CERN) ; Shimada, Taihei (KEK, Tsukuba ; J-PARC) ; Sugiyama, Yasuyuki (KEK, Tsukuba ; J-PARC) ; Tamura, Fumihiko (KEK, Tsukuba ; J-PARC) ; Yamamoto, Masanobu (KEK, Tsukuba ; J-PARC) et al.
A power upgrade of the existing 8 kW solid-state driver amplifier is required for the acceleration of high intensity proton beams in the J-PARC 3 GeV rapid cycling synchrotron (RCS). The development of a 25 kW amplifier with gallium nitride (GaN) HEMTs and based on 6.4 kW modules is ongoing. [...]
2022 - 3 p.
- Published in : JACoW IPAC 2022 (2022) 1333-1335
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1333-1335
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2.
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Low Level RF Control System Modules for J-PARC RCS
/ Schnase, Alexander (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Anami, Shozo (KEK, Ibaraki) ; Ezura, Eizi (KEK, Ibaraki) ; Hara, Keigo (KEK, Ibaraki) ; Nomura, Masahiro (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Ohmori, Chihiro (KEK, Ibaraki) ; Takagi, Akira (KEK, Ibaraki) ; Tamura, Fumihiko (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Yamamoto, Masanobu (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Yoshii, Masahito (KEK, Ibaraki)
2006 - 3 p.
External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1465
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3.
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High Power Test of MA Cavity for J-PARC RCS
/ Yamamoto, Masanobu (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Anami, Shozo (KEK, Ibaraki) ; Ezura, Eizi (KEK, Ibaraki) ; Hara, Keigo (KEK, Ibaraki) ; Hasegawa, Kazuo (JAEA, Ibaraki-ken) ; Nomura, Masahiro (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Ohmori, Chihiro (KEK, Ibaraki) ; Schnase, Alexander (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Takagi, Akira (KEK, Ibaraki) ; Tamura, Fumihiko (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) et al.
2006 - 3 p.
External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1322
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4.
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Development of the Feed-forward System for Beam Loading Compensation in the J-PARC RCS
/ Tamura, Fumihiko (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Anami, Shozo (KEK, Ibaraki) ; Ezura, Eizi (KEK, Ibaraki) ; Hara, Keigo (KEK, Ibaraki) ; Nomura, Masahiro (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Ohmori, Chihiro (KEK, Ibaraki) ; Schnase, Alexander (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Takagi, Akira (KEK, Ibaraki) ; Yamamoto, Masanobu (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Yoshii, Masahito (KEK, Ibaraki)
2006 - 3 p.
External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1319
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5.
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New Cutting Scheme of Magnetic Alloy Cores for J-PARC Synchrotrons
/ Ohmori, Chihiro (KEK, Ibaraki) ; Anami, Shozo (KEK, Ibaraki) ; Ezura, Eizi (KEK, Ibaraki) ; Funahashi, Yoshisato (KEK, Ibaraki) ; Hara, Keigo (KEK, Ibaraki) ; Hasegawa, Katsushi (KEK, Ibaraki) ; Morita, Yuichi (ICEPP, Tokyo) ; Nomura, Masahiro (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Schnase, Alexander (JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken) ; Takagi, Akira (KEK, Ibaraki) et al.
2006 - 3 p.
External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.1313
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6.
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Dual Harmonic Operation with Broadband MA Cavities in J-PARC RCS
/ Yamamoto, Masanobu ; Nomura, Masahiro ; Schnase, Alexander ; Tamura, Fumihiko ; Anami, Shozo ; Ezura, Eizi ; Hara, Keigo ; Hashimoto, Yoshinori ; Ohmori, Chihiro ; Takagi, Akira et al.
2005 - 3 p.
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.931
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7.
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Present Status of J-PARC Ring RF Systems
/ Yoshii, Masahito ; Anami, Shozo ; Ezura, Eizi ; Hara, Keigo ; Hashimoto, Yoshinori ; Nomura, Masahiro ; Ohmori, Chihiro ; Schnase, Alexander ; Takagi, Akira ; Tamura, Fumihiko et al.
The accelerator of the J-PARC complex consists of the 400 MeV (initially 181 MeV) linac, the rapid cycling 3 GeV Synchrotron and the 50 GeV main Synchrotron. To accelerate an ultra-high intense proton beam, the synchrotrons require a high field gradient rf system (~25kV/m). [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.475
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8.
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Low Level RF Control System of J-PARC Synchrotrons
/ Tamura, Fumihiko ; Anami, Shozo ; Ezura, Eizi ; Hara, Keigo ; Nomura, Masahiro ; Ohmori, Chihiro ; Schnase, Alexander ; Takagi, Akira ; Yamamoto, Masanobu ; Yoshii, Masahito
We present the concept and the design of the low level RF (LLRF) control system of the J-PARC synchrotrons. The J-PARC synchrotrons are the rapid cycling 3-GeV synchrotron (RCS) and the 50-GeV main ring (MR) which require very precise and stable LLRF control systems to accelerate the ultra-high proton beam current. [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3624
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9.
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Control Loops for the J-PARC RCS Digital Low-Level RF Control
/ Schnase, Alexander ; Anami, Shozo ; Ezura, Eizi ; Hara, Keigo ; Nomura, Masahiro ; Ohmori, Chihiro ; Takagi, Akira ; Tamura, Fumihiko ; Yamamoto, Masanobu ; Yoshii, Masahito
The low-level radiofrequency control for the Rapic Cycling Synchrotron of J-PARC is based on digital signal processing. This system controls the acceleration voltages of 12 magnetic alloy loaded cavities. [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.1063
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10.
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Enhancement of Laser Power from a Mode Lock Laser with an Optical Cavity
/ Nomura, Masahiro ; Hirano, Koichiro ; Takano, Mikio ; Sakai, Hiroshi ; Araki, Sakae ; Higashi, Yasuo ; Taniguchi, Takashi ; Urakawa, Junji ; Yamazaki, Yoshio ; Honda, Yosuke et al.
Tsukuba : KEK, 2004 - 3 p.
External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.2637
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