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Yamamoto, Kazami; Yamamoto, Masanobu; Yamazaki, Yoshio; Nomura, Masahiro; Suganuma, Kazuaki; Fujirai, Kosuke; Kamiya, Junichiro; Nakanoya, Takamitsu; Hatakeyama, Shuichiro; Yoshimoto, Masahiro; et al.
Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.277 - 281, 2023/01
The J-PARC 3GeV Rapid Cycling Synchrotron (RCS) is aiming to provide the proton beam of very high power for neutron experiments and the main ring synchrotron. We have continued the beam commissioning and the output power from RCS have been increasing. In recent years, we have been trying continuous supply of 1-MW high-intensity beam, which is the design value, to a neutron target. We tried to operate continuously for over 40 hours in June 2020. However, some trouble occurred and the operation was frequently suspended. In June 2021, we tried again 1-MW operation but it was suspended due to deterioration of the cooling water performance. Last summer shutdown period, we recovered performance of the cooling water system and retried in this June. In the final case, the outside temperature became extremely high. We could not keep 1-MW power, whereas 600 kW beam was delivered in stable.
Yamamoto, Kazami; Kinsho, Michikazu; Hayashi, Naoki; Saha, P. K.; Tamura, Fumihiko; Yamamoto, Masanobu; Tani, Norio; Takayanagi, Tomohiro; Kamiya, Junichiro; Shobuda, Yoshihiro; et al.
Journal of Nuclear Science and Technology, 59(9), p.1174 - 1205, 2022/09
Times Cited Count：5 Percentile：84.97(Nuclear Science & Technology)In the Japan Proton Accelerator Research Complex, the purpose of the 3 GeV rapid cycling synchrotron (RCS) is to accelerate a 1 MW, high-intensity proton beam. To achieve beam operation at a repetition rate of 25 Hz at high intensities, the RCS was elaborately designed. After starting the RCS operation, we carefully verified the validity of its design and made certain improvements to establish a reliable operation at higher power as possible. Consequently, we demonstrated beam operation at a high power, namely, 1 MW. We then summarized the design, actual performance, and improvements of the RCS to achieve a 1 MW beam.
Yamamoto, Kazami; Yamamoto, Masanobu; Yamazaki, Yoshio; Nomura, Masahiro; Suganuma, Kazuaki; Fujirai, Kosuke; Kamiya, Junichiro; Hatakeyama, Shuichiro; Hotchi, Hideaki; Yoshimoto, Masahiro; et al.
Proceedings of 17th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.209 - 213, 2020/09
The J-PARC 3GeV Rapid Cycling Synchrotron (RCS) is aiming to provide the proton beam of very high power for neutron experiments and the main ring synchrotron. We have continued the beam commissioning and the output power from RCS have been increasing. In recent years, just before the summer shutdown period, we have been trying continuous supply of 1-MW high-intensity beam, which is the design value, to a neutron target. First trial was 1-hour continuous operation in July 2018, and second trial was 10-hours continuous in July 2019. In both cases, we achieved almost stable operation. Furthermore, in June 2020, we tried to operate continuously for over 40 hours. But in this case, some trouble occurred and the operation was frequently suspended. Through these continuous operation trials, we have identified issues for stable operation of 1 MW. In this presentation, we will report the results of 1-MW continuous operation and issues obtained from these results.
Okabe, Kota; Yamamoto, Kazami; Kamiya, Junichiro; Takayanagi, Tomohiro; Yamamoto, Masanobu; Yoshimoto, Masahiro; Takeda, Osamu*; Horino, Koki*; Ueno, Tomoaki*; Yanagibashi, Toru*; et al.
Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.853 - 857, 2017/12
The most important issue is to reduce the uncontrolled beam loss in the high intensity hadron accelerator such as J-PARC proton accelerators. The J-PARC 3 GeV Synchrotron (RCS) has a collimator system which narrows a high intensity beam in the RCS. After startup of RCS in 2007, the collimator system of the RCS worked well. However, in April 2016, vacuum leakage at the collimator system occurred during the maintenance operation. To investigate a cause of the failure, we took apart iron shields of the collimator reducing exposed dose of operators. As a result of inspection, we succeeded to identify the cause of the vacuum leakage failure. In this presentation, we report the failure investigation of the beam collimator system in the RCS.
Yamamoto, Kazami; Okabe, Kota; Kamiya, Junichiro; Yoshimoto, Masahiro; Takeda, Osamu; Takayanagi, Tomohiro; Yamamoto, Masanobu
Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.314 - 318, 2016/11
The 3 GeV Rapid-Cycling Synchrotron (RCS) of the Japan Proton Accelerator Research Complex (J-PARC) project generates 1MW proton beam for the neutron experiments and Main ring accelerator. In case of such high intensity hadron accelerator, the most important issue is to reduce the uncontrolled loss. The beam collimation system is designed for this purpose. In the present design, the physical aperture is 1.5 times wider than the primary collimator aperture and the beam loss can be enough localized on this condition. After a startup of RCS in 2007, the collimator system of RCS worked well. But vacuum leakage occurred during the maintenance period in April, 2016. Since it was expected that the beam collimator was radio-activated very much, we took the influence of radiation into consideration and designed the collimator (ie. a remote clamp system to connect/take off it with a vacuum flange away from itself). Therefore, during the recovery work of the collimator, we were able to reduce the worker dose to less than 60 micro Sv though the collimator block had a residual dose of 40 mSv/h.
Hayashi, Naoki; Harada, Hiroyuki; Horino, Koki; Hotchi, Hideaki; Kamiya, Junichiro; Kinsho, Michikazu; Saha, P. K.; Shobuda, Yoshihiro; Takayanagi, Tomohiro; Tani, Norio; et al.
Proceedings of 4th International Particle Accelerator Conference (IPAC '13) (Internet), p.3833 - 3835, 2014/07
no abstracts in English
Tani, Norio; Hotchi, Hideaki; Kamiya, Junichiro; Kinsho, Michikazu; Takeda, Osamu; Yamamoto, Masanobu
Proceedings of 4th International Particle Accelerator Conference (IPAC '13) (Internet), p.2971 - 2973, 2013/06
Misalignment of several millimeters of the magnets of J-PARC 3GeV RCS in both horizontal and vertical directions was caused by the Tohoku Region Pacific Coast Earthquake on March 11, 2011. As the result of orbit calculation showed that the beam loss was acceptable for beam operation at 300 kW, beam operation with the current placement has been implemented. Realignment of the equipment will be carried out from August to December in 2013. As the survey carried out in the summer of 2012 found out misalignment of vacuum ducts, their positioning is necessary. In this paper these measurement result and latest alignment plan for J-PARC 3GeV RCS are reported.
Hayashi, Naoki; Harada, Hiroyuki; Hotchi, Hideaki; Kamiya, Junichiro; Saha, P. K.; Shobuda, Yoshihiro; Takayanagi, Tomohiro; Tani, Norio; Yamamoto, Kazami; Yamamoto, Masanobu; et al.
Proceedings of 3rd International Particle Accelerator Conference (IPAC '12) (Internet), p.3921 - 3923, 2012/05
The injection energy upgrade from 181 to 400 MeV for J-PARC RCS is planned in 2013. One power supply was replaced and using for a normal operation. An IGBT chopper type power supply which has larger switching noise will be changed to a capacitor bank type. New injection system allows the center injection with 400 MeV and switching painting area. As further steps for the leakage field, it begins to diminish the effect from the beam transport line. A quadrupole corrector system is designed and fabricated to compensate the beta beat due to the injection bump as the first step. Two profile monitors will be modified to correct position systematic errors and third one is going to be installed at dispersion free section. It is important to minimize kicker impedance lower, which may cause the beam instability. A diode, which has high reverse breakdown voltage and works with lower forward voltage, has been developed. Using this new diode, an experiment shows the impedance becomes lower.
Hayashi, Naoki; Hotchi, Hideaki; Kamiya, Junichiro; Saha, P. K.; Takayanagi, Tomohiro; Yamamoto, Kazami; Yamamoto, Masanobu; Yamazaki, Yoshio
Proceedings of 2nd International Particle Accelerator Conference (IPAC 2011) (Internet), p.2730 - 2732, 2011/09
The J-PARC RCS is a high beam power Rapid-Cycling Synchrotron (RCS). The original designed injection energy is 400 MeV, although presently it is 181 MeV, and its beam power is limited to 0.6 MW. Works to recover the Linac energy are ongoing and injection magnets power supplies upgrade for two bump and new knob are required in the RCS. In order to achieve 1 MW designed beam power, new instrumentation, like quadrupole corrector or to reduce kicker impedance, are also planned simultaneously. Activities related injection energy recovery in the J-PARC RCS are presented.
Hayashi, Naoki; Hotchi, Hideaki; Kamiya, Junichiro; Saha, P. K.; Takayanagi, Tomohiro; Yamamoto, Kazami; Yamamoto, Masanobu; Yamazaki, Yoshio
Proceedings of 8th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.306 - 308, 2011/08
The J-PARC RCS is a high beam power Rapid-Cycling Synchrotron (RCS). The original designed injection energy is 400MeV, although presently it is 181MeV, and its beam power is limited to 0.6MW. Works to recover the Linac energy are ongoing and injection magnets power supplies upgrade are required in the RCS. In order to achieve 1MW designed beam power, new instrumentation is also planned simultaneously. Activities related injection energy recovery in the J-PARC RCS is presented.
Tanaka, Naritake*; Kimura, Hitoshi*; Faried, A.*; Sakai, Makoto*; Sano, Takaaki*; Inose, Takanori*; Soda, Makoto*; Okada, Koji*; Nakajima, Masanobu*; Miyazaki, Tatsuya*; et al.
Cancer Science, 101(6), p.1487 - 1492, 2010/06
Times Cited Count：12 Percentile：31.77(Oncology)We examined the intracellular localization of cisplatin, a key chemotherapeutic agent, in esophageal cancer cell lines and determined their sensitivity to cisplatin using in-air micro-PIXE. Two human esophageal squamous cell carcinoma (ESCC) cell lines, TE-2 and TE-13, were examined for their response to cisplatin using MTT assay, flow cytometry and DNA fragmentation assays. Real-time reverse transcription-polymerase chain reaction was also used to evaluate the mRNA expression of multidrug resistance protein 2 (MRP2) in both cell lines. Platinum localizations of intracellular and intranuclear were measured using in-air micro-PIXE. TE-2 cells were more sensitive to cisplatin than TE-13 cells. The results of this study suggest that in-air micro-PIXE could be a useful quantitative method for evaluating the cisplatin sensitivity of individual cells. Finally, we speculate that MRP2 in the cell membrane may play an important role in regulating cisplatin sensitivity of ESCC cells.
crystalsAbe, Kenichiro*; Miyoshi, Yoshihiro*; Ashida, Atsushi*; Wakita, Kazuki*; Oshima, Takeshi; Morishita, Norio; Kamiya, Tomihiro; Watase, Seiji*; Izaki, Masanobu*
Japanese Journal of Applied Physics, 44(1B), p.718 - 721, 2005/01
Times Cited Count：1 Percentile：4.7(Physics, Applied)no abstracts in English
Tanaka, Naritake*; Sakai, Makoto*; Kimura, Hitoshi*; Soda, Makoto*; Nakajima, Masanobu*; Kato, Hiroyuki*; Asao, Takayuki*; Kuwano, Hiroyuki*; Oikawa, Masakazu*; Sato, Takahiro; et al.
no journal, ,
no abstracts in English
Namekawa, Yuya; Kamiya, Junichiro; Yamamoto, Masanobu; Tani, Norio; Kinsho, Michikazu
no journal, ,
At the J-PARC 3GeV synchrotron (RCS), the displacement of the beam line equipment occurred on the impact of the Great East Japan Earthquake. The maximum displacement of the electromagnet reached 3 mm (vertical direction), 8mm (horizontal direction). In addition, vacuum duct center position with respect to the center of the opening electromagnet also has caused the displacement of about 4 mm at large. Results of the beam trajectory calculation, it was found that it is not possible to increase the beam intensity for excessive beam loss occurs in such a state. Therefore, it was decided to realignment of the vacuum equipment and electromagnet of all in 2013. In this presentation, we will introduce to focus on work in the field of the details and procedures of the realignment work.
Takata, Takashi; Takada, Tsuyoshi*; Narumiya, Yoshiyuki*; Kamiya, Masanobu*; Jimbo, Masakazu*; Muta, Hitoshi*; Hayashi, Kentaro*
no journal, ,
Since earthquake surely takes place in Japan, safety on nuclear power plant (NPP) against earthquake is one of the most important issue. In April 2016, a research council of "Basic Safety Principles on Earthquake Engineering for Nuclear Power Plants" was established in Japan Association for Earthquake Engineering (JAEE) to clarify a basic concept and a practice of the safety principles among a mature discussion by engineers in a wide range of nuclear safety and earthquake engineering fields. In the present report, the summery of the basic safety principles is introduced and a sufficient exchange of views will be conducted through the session.
Takata, Takashi; Takada, Tsuyoshi*; Narumiya, Yoshiyuki*; Kamiya, Masanobu*; Jimbo, Masakazu*; Muta, Hitoshi*; Hayashi, Kentaro*
no journal, ,
The research committee on "Basic Safety Principles on Earthquake Engineering" was established in Japan Association for Earthquake Engineering (JAEE) to propose the basic safety principles on earthquake engineering for nuclear power plants (NPPs) based on defense in depth and also risk concept. In the committee, three working groups were also established. In working group 1 (WG1), which was parallel established as a subcommittee of "Basic Safety Principles on Earthquake Engineering" in Atomic Energy Society of Japan (AESJ), the contents of the basic safety principles on earthquake engineering has been discussed and the material for discussion has been summarized. This paper summarizes the basic principles and points of contention through the discussion.
