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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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20-Year Collaboration on Synchrotron RF Between CERN and J-PARC
/ Ohmori, Chihiro (J-PARC) ; Brucoli, Matteo (CERN) ; Brugger, Markus (CERN) ; Damerau, Heiko (CERN) ; Danzeca, Salvatore (CERN) ; Hasegawa, Katsushi (J-PARC) ; Morita, Yuichi (J-PARC) ; Okita, Hidefumi (J-PARC) ; Paoluzzi, Mauro (CERN) ; Rossi, Carlo (CERN) et al.
in 2002, KEK/J-PARC and CERN started the collaboration on the RF systems of Low Energy Ion Ring to use magnetic alloy loaded cavities in 2002 for heavy ion collision program at LHC. It was an exchange of our expertise on the wideband cavities and high-power solid-state amplifiers. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 3130
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.3130
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3.
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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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4.
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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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5.
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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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6.
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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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7.
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Beam Acceleration with Full-digital LLRF Control System in the J-PARC RCS
/ Tamura, F (JAEA, Ibaraki) ; Anami, S (KEK, Tsukuba) ; Ezura, E (KEK, Tsukuba) ; Haga, K (JAEA, Ibaraki) ; Hara, K (KEK, Tsukuba) ; Hasegawa, K (JAEA, Ibaraki) ; Nomura, M (JAEA, Ibaraki) ; Ohmori, C (KEK, Tsukuba) ; Schnase, A (JAEA, Ibaraki) ; Takagi, A (KEK, Tsukuba) et al.
2008 - 3 p.
External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPC126
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8.
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J-PARC RCS Non-linear Frequency Sweep Analysis
/ Schnase, A (JAEA, Ibaraki) ; Anami, S (KEK, Tsukuba) ; Ezura, E (KEK, Tsukuba) ; Haga, K (JAEA, Ibaraki) ; Hara, K (KEK, Tsukuba) ; Hasegawa, K (JAEA, Ibaraki) ; Nomura, M (JAEA, Ibaraki) ; Ohmori, C (KEK, Tsukuba) ; Takagi, A (KEK, Tsukuba) ; Tamura, F (JAEA, Ibaraki) et al.
2008 - 3 p.
External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPC120
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J-PARC Contributions to the LHC Injector Upgrade (LIU) Project
/ Ohmori, Chihiro (J-PARC) ; Paoluzzi, Mauro (CERN) ; Tamura, Fumihiko (J-PARC ; JAEA, Ibaraki) ; Hasegawa, Katsushi (J-PARC) ; Sugiyama, Yasuyuki (J-PARC) ; Shirakata, Masashi (J-PARC) ; Yoshii, Masahito (J-PARC)
The LHC Injector Upgrade (LIU) was launched in 2010 in synergy with the High Luminosity LHC (HL-LHC) project.^2) It includes the consolidation/upgrade of the PS Booster RF systems:^3,4) all the existing ferrite-loaded RF cavities are being replaced with wideband RF systems during the 2019–2020 long shut down. The magnetic-annealed cores improve the cavity performance and reduce the number of the straight sections for RF systems. [...]
2021 - 6 p.
- Published in : JPS Conf. Proc. 33 (2021) 011006-1-011006-6
Fulltext: PDF;
In : J-PARC Symposium 2019, Tsukuba, Japan, 23 - 26 Sep 2019, pp.011006-1-011006-6
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10.
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Acceleration Voltage Pattern for J-PARC RCS
/ Yamamoto, M (JAEA, Ibaraki) ; Anami, S (KEK, Tsukuba) ; Ezura, E (KEK, Tsukuba) ; Hara, K (KEK, Tsukuba) ; Hasegawa, K (JAEA, Ibaraki) ; Nomura, M (JAEA, Ibaraki) ; Ohmori, C (KEK, Tsukuba) ; Schnase, A (JAEA, Ibaraki) ; Takagi, A (KEK, Tsukuba) ; Tamura, F (JAEA, Ibaraki) et al.
2008 - 3 p.
External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPC132
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