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Journal Articles

Development of a photocathode preparation system for a high current electron gun

Nishimori, Nobuyuki; Nagai, Ryoji; Matsuba, Shunya; Sawamura, Masaru; Hajima, Ryoichi

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1031 - 1033, 2014/10

no abstracts in English

Journal Articles

Development of a 500kV photoemission gun

Nishimori, Nobuyuki; Nagai, Ryoji; Yamamoto, Masahiro*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.165 - 170, 2014/10

no abstracts in English

Journal Articles

Effective emittance expansion for transverse acceptance measurement of an AVF cyclotron

Kashiwagi, Hirotsugu; Miyawaki, Nobumasa; Kurashima, Satoshi; Okumura, Susumu

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1186 - 1188, 2014/10

no abstracts in English

Journal Articles

Calibration of phase detector using IQ modulator

Miyao, Tomoaki*; Miura, Akihiko; Kawane, Yusuke*; Ouchi, Nobuo

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.718 - 720, 2014/10

The beam energy of the J-PARC Linac is calculated by TOF (Time-of-Flight) method with the flight distance and the beam phases measured at the two phase monitors. Because the accuracy of the beam energy calculation is directly depending on the errors in the phase measurement system, all beam phase monitors are calibrated annually. We have decided to use an IQ modulator circuit to realize the high accurate calibration and to reduce the calibration time. We describe the original and new procedure of the energy calculation in this paper.

Journal Articles

Present status of JAEA-Tokai tandem accelerator and booster

Matsuda, Makoto; Osa, Akihiko; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; et al.

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.410 - 413, 2014/10

no abstracts in English

Journal Articles

MWPM DAQ System for J-PARC RCS

Hatakeyama, Shuichiro; Yoshimoto, Masahiro

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.703 - 705, 2014/10

The J-PARC LINAC introduced ACS (Annular-ring Coupled Structure) cavity and now available the 400 MeV beam extraction. As for the RCS (Rapid Cycling Synchrotron) the power supply of the injection magnets were replaced those can acceptable the 400 MeV beam injection. Because there occured many troubles of equipments in the early phase of the beam study, we desired to shorten the measurement time of the beam monitor to determine the parameters. In this report it is described the signal processing system of MWPM (Multi-wire profile monitor) which is used to measure the injection beam profile for better accuracy and shorter measurement time.

Journal Articles

Technical development for the utilization of large-area uniform ion beams at the JAEA TIARA cyclotron

Yuri, Yosuke; Yuyama, Takahiro; Ishizaka, Tomohisa; Ishibori, Ikuo; Okumura, Susumu

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.862 - 865, 2014/10

no abstracts in English

Journal Articles

Development status of control system for IFMIF/EVEDA prototype accelerator

Takahashi, Hiroki; Narita, Takahiro; Nishiyama, Koichi; Usami, Hiroki; Sakaki, Hironao; Kasugai, Atsushi; Kojima, Toshiyuki*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.799 - 802, 2014/10

no abstracts in English

Journal Articles

Development of tools for the J-PARC operation data archiving using HBase/Hadoop

Kikuzawa, Nobuhiro; Ikeda, Hiroshi; Yoshii, Akinobu*; Kato, Yuko; Ouchi, Nobuo

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.794 - 798, 2014/10

no abstracts in English

Journal Articles

Development of timing system for RF ion source & RFQ III test stand

Sawabe, Yuki; Ito, Yuichi; Kawase, Masato; Fukuta, Shimpei; Suzuki, Takahiro*; Kikuzawa, Nobuhiro; Ouchi, Nobuo

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.748 - 751, 2014/10

no abstracts in English

Journal Articles

Present status of J-PARC linac

Oguri, Hidetomo; Hasegawa, Kazuo; Ito, Takashi; Chishiro, Etsuji; Hirano, Koichiro; Morishita, Takatoshi; Shinozaki, Shinichi; Ao, Hiroyuki; Okoshi, Kiyonori; Kondo, Yasuhiro; et al.

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.389 - 393, 2014/10

no abstracts in English

Journal Articles

Construction of the equipment for a demonstration of laser Compton-scattered photon source at the cERL

Nagai, Ryoji; Hajima, Ryoichi; Mori, Michiaki; Shizuma, Toshiyuki; Akagi, Tomoya*; Kosuge, Atsushi*; Honda, Yosuke*; Urakawa, Junji*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1328 - 1331, 2014/10

A high intensity $$gamma$$-ray source from the laser Compton scattering (LCS) by an electron beam in an energy-recovery linac (ERL) is a key technology for a nondestructive assay system to identify nuclear materials. In order to demonstrate accelerator and laser technologies required for a LCS photon generation, a LCS photon source is under construction at the Compact ERL (cERL). The LCS photon source consists of a mode-locked fiber laser and a laser enhancement cavity. A beamline and an experimental hatch are also under construction. The commissioning of the LCS photon source will be started in February 2015 and LCS photon generation is scheduled in March 2015.

Journal Articles

Development of the beamline flux monitor for the laser Compton-scattered photon source

Nagai, Ryoji; Hajima, Ryoichi; Mori, Michiaki; Shizuma, Toshiyuki; Akagi, Tomoya*; Kosuge, Atsushi*; Honda, Yosuke*; Urakawa, Junji*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.839 - 842, 2014/10

In order to demonstrate accelerator and laser technologies required for a laser Compton scattering (LCS) photon generation, a LCS photon source is under construction at the Compact ERL (cERL). We considered the flux monitors for the adjustment LCS photon source. A thin scintillator detector and a silicon drift detector are employed as flux monitors and are installed at the upstream part of the LCS beamline. The background signal level due to the bremsstrahlung of the electron beam was measured by a CsI(pure) scintillator. In the result of the measurement, the background signal is acceptable level for the flux monitors.

Journal Articles

Interlock system of beam line for beam current upgrade

Kawane, Yusuke*; Miura, Akihiko; Miyao, Tomoaki*; Hirano, Koichiro; Sugimura, Takashi*; Kato, Yuko; Sawabe, Yuki; Fukuda, Shimpei; Ouchi, Nobuo

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1288 - 1291, 2014/10

In the J-PARC Linac, because an upgrading of a beam current up to 50mA using an RF-driven ion source and a new RFQ Linac cavity is in progress, we have developed a new frontend equipments. In order to protect the scraper against 50 mA, we need to observe the temperature and to avoid the excess heat loading of the scraper surface and to count the irradiated beam particles. We also monitor the beam transmission between the upstream and downstream of the chopper cavity to check the chopping errors using the beam current monitors. We fabricated the interlock system for the temperature, irradiated particle numbers and beam transmission. And we tested them in the test stand with actual beam. This paper describes the interlock system and their test results.

Journal Articles

Increment of the machine protection system in J-PARC rapid cycling synchrotron

Yamamoto, Kazami; Kawase, Masato; Iwama, Yuhei; Fukuta, Shimpei; Kato, Yuko; Ouchi, Nobuo; Meigo, Shinichiro; Oi, Motoki; Kamikubota, Norihiko*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.771 - 774, 2014/10

The radiation leak accident happened in the hadron experimental hall of J-PARC on May 23, 2013. The accident was caused by a target sublimation due to an unanticipated beam from the 50 GeV main ring (MR). To detect and prevent the radiation leakage in all facilities of J-PARC, we improve the machine protection system (MPS). In the J-PARC 3GeV synchrotron (Rapid Cycling Synchrotron, RCS), a monitoring system of an abnormal state of the extraction beam to the mercury target of material life science experiment facility (MLF) were prepared. The radiation level of the gas in the tunnel were able to always observed by connecting radiation safety system and accelerator control system. The dump temperature was included in the MPS. We also developed new interlock system that can stop the beam immediately when the beam current exceed the limit.

Journal Articles

Status of the horizontal paint bump power supply of the J-PARC RCS

Ueno, Tomoaki; Takayanagi, Tomohiro; Horino, Koki; Hayashi, Naoki; Kinsho, Michikazu

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1135 - 1138, 2014/10

In 3-GeV RCS (Rapid-Cycling Synchrotron) of J-PARC (Japan Proton Accelerator Research Complex), the beam commissioning test with 400 MeV beam injection energy from LINAC (Linear Accelerator) was started in January, 2014 and the J-PARC user operation was started in February of the year. The performance of the paint bump power supply was upgraded, which is 1.6 times the output current and 2 times the output voltage. The new power supply operation was started without a trouble on schedule. However, after the test operation of the new shift bump (SB) power supply, the trouble of the circuit part was frequent. Therefore the excitation wave pattern of the horizontal paint bump power supply, which was combined the function of the horizontal shift bump power supply pattern and the painting injection pattern, was demanded. In this paper, the contents of the upgraded power supply of the horizontal paint bump and the method of the any output wave pattern formation is reported.

Journal Articles

Report of the temperature problem of new horizontal shift bump power supply at the J-PARC RCS

Horino, Koki; Takayanagi, Tomohiro; Ueno, Tomoaki; Hayashi, Naoki; Kinsho, Michikazu; Irie, Yoshiro*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1143 - 1147, 2014/10

In 3-GeV RCS of J-PARC, the new shift bump power supply has been development and manufactured according to upgrading of 400 MeV injection beam energy of the LINAC. However, the trouble of the DC charger of the FT-unit, which did not occur in the factory, was frequent. Therefore, in user operation, the power supply was operated only with the R/F-unit without using the FT unit. As a result, the flat-top part of the bump waveform was to be a downward. The electrolytic capacitor of the R/F-unit can be not regenerated the energy of this flat top part and the operation time of the DC charger was became usually longer than time. The DC charger was overloaded and the temperature of the circuit parts was higher.

Journal Articles

Development and present status of new horizontal shift bump power supply for injection bump at the J-PARC RCS

Takayanagi, Tomohiro; Ueno, Tomoaki; Horino, Koki; Hayashi, Naoki; Kinsho, Michikazu; Okabe, Kota; Irie, Yoshiro*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1139 - 1142, 2014/10

The new shift bump (SB) power supply which doubled power supply capacity has been developed and manufactured according to upgrading of 400MeV injection beam energy of the LINAC (Linear accelerator) in J-PARC (Japan Proton Accelerator Research Complex) 3-GeV RCS (Rapid-Cycling Synchrotron). The power supply adopted a capacitor commutation method to form the trapezoid waveform pattern (bump waveform) by the IGBT (Insulated Gate Bipolar Transistor) switch. The test operation was started in January, 2014. However, the trouble of a diode in the FT-unit (Flat top unit) was frequent and the user operation of the J-PARC was started without the FT-unit. As a result, the flat-top part of the bump waveform was became a downward, and it has been to a formation defectiveness wave pattern. Therefore, using a horizontal paint bump magnet and a pulse steering magnet, the beam injection point of the RCS was fixed. This paper will be reported the characteristic, the trouble and the user operation about the new shift bump power supply.

Journal Articles

Improvement of J-PARC klystron high voltage power supply

Chishiro, Etsuji; Kawamura, Masato*; Sagawa, Ryu*; Ogawa, Shinichi*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1091 - 1093, 2014/10

In J-PARC linac, six units of high voltage power supplies for 324 MHz klystrons have operated since 2006, and those running time exceed 35,000 hours. In addition, six units of power supplies for the 972 MHz klystrons have been operation since 2013. In the power supply, various troubles occur under the operation. In some anode modulators, arc discharge in the transformer oil had occurred due to the deterioration of the auxiliary solid insulator. In three modules combining a step-up transformer and a rectifier, the high voltage diode was breakdown because an unexpected overvoltage was applied. And by improving the voltage dividing resistor of the module, high stability cathode voltage was achieved. In this report, we describe the trouble and the improvement that occurred in the equipment.

Journal Articles

Study of magnetic alloy cut-core for J-PARC MR

Nomura, Masahiro; Yamamoto, Masanobu; Shimada, Taihei; Tamura, Fumihiko; Omori, Chihiro*; Toda, Makoto*; Hasegawa, Katsushi*; Hara, Keigo*; Yoshii, Masahito*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1037 - 1041, 2014/10

J-PARC 3 GeV RCS and Main Ring (MR) employ RF cavities loaded with Magnetic Alloy (MA) cores. The RF cavities in RCS employ un-cut cores and the RF cavities in MR employ cut cores to increase the Q-value. In this paper, we discuss the magnetic characteristics of cut cores. At first, we show the fundamental magnetic characteristics of cut core and the influence of leakage magnetic field. Next, we discuss the relation between Rp of un-cut core and cut core. At last, we show what parameters are effective to increase the cut core Rp. Rp is a key parameter to achieve a high field gradient for increasing the beam power.

28 (Records 1-20 displayed on this page)