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Maebara, Sunao; Antonio, P.*; Ichikawa, Masahiro; Takahashi, Hiroki; Suzuki, Hiromitsu; Sugimoto, Masayoshi
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.561 - 563, 2014/06
no abstracts in English
Nishimori, Nobuyuki; Nagai, Ryoji; Matsuba, Shunya; Hajima, Ryoichi; Yamamoto, Masahiro*; Miyajima, Tsukasa*; Honda, Yosuke*; Uchiyama, Takashi*; Iijima, Hokuto*; Kuriki, Masao*; et al.
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.174 - 178, 2014/06
no abstracts in English
Miyawaki, Nobumasa; Fukuda, Mitsuhiro*; Kurashima, Satoshi; Kashiwagi, Hirotsugu; Okumura, Susumu; Arakawa, Kazuo*; Kamiya, Tomihiro
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.500 - 502, 2014/06
no abstracts in English
Fukuta, Shimpei; Sawabe, Yuki; Suzuki, Takahiro*; Ishiyama, Tatsuya*; Kawase, Masato*; Ito, Yuichi; Kato, Yuko; Yoshii, Akinobu; Kikuzawa, Nobuhiro; Ouchi, Nobuo
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1122 - 1125, 2014/06
The installation of Cs-seeded RF-driven H
ion source (RF ion source) to J-PARC LINAC is scheduled in 2014. Similarly the replacement of RFQ III from RFQ is scheduled in 2014. The test stand of the cooperation of RF ion source & RFQ III is being made in the J-PARC LINAC building for the beam acceleration examination now. The J-PARC control group designed test stand control system by thinking that test stand control system had to be equal to J-PARC accelerator control system. Specifically, Introduction of MPS for protect an apparatus. Implementation of EPICS environment for remotely controlling the equipment. It is construction of the timing system for sending a timing signal to each accelerator component device. This report describes construction of the control system in a test stand.
Hirano, Koichiro; Ito, Takashi; Kondo, Yasuhiro; Shinozaki, Shinichi; Chishiro, Etsuji; Miura, Akihiko; Morishita, Takatoshi; Ikegami, Masanori*; Kubota, Chikashi*; Sugimura, Takashi*; et al.
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.858 - 861, 2014/06
Two RF-deflecting cavities as a chopper and a beam scraper have been used in the MEBT between a 324 MHz RFQ and a 50-MeV DTL of the J-PARC Linac. We plan to increase a peak beam current up to 50 mA by replacing an ion source and a RFQ after the summer shutdown in 2014. Beam loss occurs in the RF chopper for the 50 mA operation. Moreover, the beam scraper cannot fully stand the beam load with 50 mA, 0.5 ms, 3 MeV, and 25 Hz. We have studied the new RF chopper cavity by using HFSS code and the tandem scraper system with two scrapers.
Tamura, Fumihiko; Yamamoto, Masanobu; Omori, Chihiro*; Yoshii, Masahito*; Schnase, A.*; Nomura, Masahiro; Tomizawa, Masahito*
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.125 - 129, 2014/06
For the slow extraction in the J-PARC MR, the rf voltage ins the cavities is turned off after finishing the acceleration to obtain a coasting beam. During the debunching process, the average momentum decrease due to the longitudinal coupling impedances in the MR. The decelatation continues until a well debunchedbeam is foarmed. The deceraration causes a reduction of the extraction efficiency due to the chromatic effects. In the J-PARC MR, a momentum loss has been observed at a relatively low beam power. To achieve higher beam power with keeping the high extraction efficiency, measures against the momentum loss are necessary. In this article, we report the observations and simulation results of the momentum losses. We adopt the rf feedforward method to cancel the wake voltage in the cavity as a measure of the momentum loss. By the feedforward, the momentum loss is significantly reduced. We achieve a high extraction efficiency, 99.5%, at the beam power of 20 kW.
Noda, Akira*; Nakao, Masao*; Soda, Hikaru*; Tongu, Hiromu*; Okamoto, Hiromi*; Osaki, Kazuya*; Yuri, Yosuke; Jimbo, Koichi*; Grieser, M.*; He, Z.*
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.143 - 145, 2014/06
ion source for the J-PARCKoizumi, Isao; Ueno, Akira; Okoshi, Kiyonori; Ikegami, Kiyoshi*; Takagi, Akira*; Yamazaki, Saishun; Oguri, Hidetomo
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.920 - 923, 2014/06
In order to satisfy the J-PARC (Japan Proton Accelerator Research Complex) 2nd stage requirements the J-PARC rf-driven H ion source is under development. The source plasma is produced by an about 50 W CW 30 MHz-rf and an about 40 kW pulsed 2 MHz-rf. The Cs is installed into the plasma chamber by opening the Cs-valve between the plasma chamber and the Cs oven, which is heated to 200
240 
C. The H ion beam current is maximized by optimizing the Cs quantity depending upon the Cs-valve opening time, the PE temperature depending upon the flow rate of the air through the PE cooling plate, the AMFC by the AMFC coil current, and so on. The experimental results using the plasma chamber made of copper, which satisfied the above requirements, were reported last year. The experimental results using the plasma chamber made of stainless steel are presented in this paper. The observed several interesting differences between the two plasma chambers are also presented.
Hori, Toshihiko; Sato, Fumiaki; Shinozaki, Shinichi; Chishiro, Etsuji; Oguri, Hidetomo; Futatsukawa, Kenta*; Fukui, Yuji*
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1001 - 1003, 2014/06
no abstracts in English
Watanabe, Yasuhiro; Tani, Norio; Inoue, Keigo*
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.628 - 631, 2014/06
no abstracts in English
Kawamura, Masato*; Chishiro, Etsuji; Hori, Toshihiko; Shinozaki, Shinichi; Sato, Fumiaki; Fukui, Yuji*; Futatsukawa, Kenta*; Yamazaki, Masayoshi*; Sagawa, Ryu*; Miyajima, Noriyuki*; et al.
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.605 - 607, 2014/06
This report describes the present status of the klystron power supply systems for the J-PARC linac. The systems for the 181 MeV linac were operated from September to May. A few breakdowns were occurred, and are described in this report. The new systems for the upgrade of the linac from 181MeV to 400 MeV have been installed until now, and the 3 HVDCPSs and the 3 anode modulators of the new systems have been operated. All the systems for 400 MeV linac will be operated in this autumn.
Suganuma, Kazuaki; Togashi, Tomohito; Kinsho, Michikazu
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.870 - 872, 2014/06
We started the initial tests of thyratron CX2004X at the switching test stand of the J-PARC. Deuteron gauss of this model is about 2 times as much as CX1193C one, by employing two reservoir tanks. A log life time more than thyratron CX1193C could be expected.
ray sourceNagai, Ryoji; Hajima, Ryoichi
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.781 - 783, 2014/06
Non-destructive measurement systems of nuclear material are under development in our group. The measurement systems are based on monochromatic -ray generated from laser Compton scattering (LCS) based on energy-recovery linac accelerator technologies. The accuracy improvement of the non-destructive measurement systems is attained by further developing a pure monochromatic LCS--ray source. The energy spread of a mode-locked short pulse laser restricts the monochromaticity of the LCS--ray source. Therefore, an ultra-narrow band width laser should be used for instead of the short pulse laser. We have proposed an asymetric confocal Fabry-Perot optical resonator as a supercavity of the pure monochromatic LCS--ray source. The influences due to the distortion and the misalignment of the mirrors were evaluated by a raytrace method. We present R&D status and the evaluation results for the optical resonator.
Kato, Shinichi*; Harada, Hiroyuki; Hotchi, Hideaki; Okabe, Kota; Omori, Chihiro*; Tamura, Fumihiko; Kinsho, Michikazu
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.444 - 447, 2014/06
The incoherent tune spread occurs by the space charge force and this becomes one of beam loss sources for the high intensity proton accelerator. This kind of beam loss was measured in the 3 GeV rapid cycling synchrotron (RCS) in J-PARC in the high intensity beam test. To measure the incoherent tune spread we have started to develop for a magnetic dipole exciter with magnetic alloy. It was found that it would be realized the exciter with several-kW electric power in the range of 3 MHz from our experimental results.
Matsuda, Makoto; Osa, Akihiko; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; et al.
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.307 - 309, 2014/06
no abstracts in English
Kikuzawa, Nobuhiro; Yoshii, Akinobu; Ikeda, Hiroshi; Kato, Yuko
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.230 - 234, 2014/06
J-PARC is consists of much equipment. In Linac and 3GeV synchrotron, the data of over the 64,000 EPICS records for these apparatus control is being collected. The data has been being stored by a RDB system using PostgreSQL now, but it is not enough in availability, performance, and extendibility. Therefore, the new system architecture is required, which is rich in the pliability and can respond to the data increasing continuously for years to come. In order to cope with this problem, we considered adoption of the distributed database architecture and constructed the demonstration system using HBase. We present results of these demonstration.
Kawase, Masato*; Takahashi, Hiroki; Kato, Yuko; Kikuzawa, Nobuhiro; Ouchi, Nobuo
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.731 - 734, 2014/06
The data acquisition in J-PARC LINAC/RCS are two methods of data archiving of polling data via EPICS Channel Access and synchronized waveform data. The synchronized waveform data are collected by several Wave Endless Recorders (WER). The WER counts the trigger number and holds waveform data in a ring buffer memory. We developed a Trigger Counter in order to manage the trigger number of each WER and synchronize the trigger number of each WER via LAN. At present, in order to install the waveform data synchronization system, we carried out verification using the timing test bench. This report presents about the waveform data synchronization system and future plan of the data acquisition system.
Yuri, Yosuke; Yuyama, Takahiro; Ishizaka, Tomohisa; Yoshida, Kenichi; Ishibori, Ikuo; Okumura, Susumu
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.138 - 142, 2014/06
no abstracts in English
Sawamura, Masaru; Nagai, Ryoji; Nishimori, Nobuyuki; Hajima, Ryoichi
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.956 - 959, 2014/06
no abstracts in English
Futatsukawa, Kenta*; Ikegami, Masanori*; Ito, Yuichi; Kikuzawa, Nobuhiro; Sato, Fumiaki; Shinozaki, Shinichi; Suzuki, Takahiro*; Chishiro, Etsuji; Hirano, Koichiro; Fang, Z.*; et al.
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1149 - 1153, 2014/06
no abstracts in English
