Refine your search:     
Report No.
 - 
Search Results: Records 1-11 displayed on this page of 11
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Design and actual performance of J-PARC 3 GeV rapid cycling synchrotron for high-intensity operation

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:3 Percentile:80.29(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.

Journal Articles

Machine status monitoring system for J-PARC RCS

Takahashi, Hiroki; Sawabe, Yuki*; Watanabe, Kazuhiko*

Proceedings of 17th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.275 - 279, 2020/09

The amount of monitor value (operation information) tends to increase, because of the increase of accelerator components, or in order to realize the safety and the stable operation. Then, an enormous volume of operation data increases the possibility of occurrence of erroneous operation such as overlooking of monitor value and etc. In order to ensure the safe and stable operation of the J-PARC accelerator, the occurrence of such human error is alarming. Therefore, for the purpose of operation support, we started designing and producing a system that monitors the machine status and detects alarm status from 2017. First, for Linac, we designed and produced a function to detect the alarm status based on the set value. Next, this function was applied to the machine status monitoring system for RCS. In addition, we are designing and developing functions to detect the alarm status based on the reference value or fixed value, for the purpose of detecting setting errors due to human error. In this paper, the current status and future plans of machine status monitoring system for J-PARC RCS are presented.

Journal Articles

Progress of criticality control study on fuel debris by Japan Atomic Energy Agency to support Secretariat of Nuclear Regulation Authority

Tonoike, Kotaro; Watanabe, Tomoaki; Gunji, Satoshi; Yamane, Yuichi; Nagaya, Yasunobu; Umeda, Miki; Izawa, Kazuhiko; Ogawa, Kazuhiko

Proceedings of 11th International Conference on Nuclear Criticality Safety (ICNC 2019) (Internet), 9 Pages, 2019/09

Criticality control of the fuel debris in the Fukushima Daiichi Nuclear Power Station would be a risk-informed control to mitigate consequences of criticality events, instead of a deterministic control to prevent such events. The Nuclear Regulation Authority of Japan has administrated a research and development program to tackle this challenge since 2014. The Nuclear Safety Research Center of Japan Atomic Energy Agency, commissioned by the authority, is conducting activities such as computations of criticality characteristics of the fuel debris, development of a criticality analysis code, preparation of criticality experiments, and development of a criticality risk analysis method.

Journal Articles

Present status of personnel protection system at J-PARC

Kikuzawa, Nobuhiro; Niki, Kazuaki*; Yamamoto, Noboru*; Hayashi, Naoki; Adachi, Masatoshi*; Watanabe, Kazuhiko*

Proceedings of 16th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.877 - 880, 2019/07

Interlock system of J-PARC is classified into a personnel protection system (PPS) for human safety and a machine protection system (MPS) for protecting equipment. The PPS of the J-PARC accelerator started from the operation at Linac in 2006 and was completed by the MR operation in 2008. In the next 10 years, some improvements have been made, such as updating video monitoring systems and establishing new interlocks. In addition to describing recent operations including these updatings, this paper reports the current status of inspections and maintenance conducted to maintain and improve reliability.

Journal Articles

Supervision and alarm system for J-PARC Linac and RCS

Takahashi, Hiroki; Sawabe, Yuki; Watanabe, Kazuhiko*; Kawase, Masato*

Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1151 - 1154, 2017/12

The amount of monitor value tends to increase, because of the increase of accelerator components, or in order to realize the safety and the stable operation. Then, an enormous volume of operation data increases the possibility of occurrence of erroneous operation such as overlooking of monitor value and etc. Then, we started to develop a system to supervise the state of the accelerator and to inform operators of abnormality early. As an initial system, we developed a system to supervise the status of Linac DTQ power supplies and etc. In this initial system, first, the function was created to make the normal range (upper and lower limit values) with reference to the current setting value. Next, the function to inform the alarm condition when the monitor value becomes outside of the normal range was realized. This function is an important function in the initial system. By this realization, we obtained the prospect of development of supervision and alarm system.

JAEA Reports

Formulation of EPICS record naming conventions in J-PARC Linac and RCS; Build process of unique and standardized name

Fukuta, Shimpei; Watanabe, Kazuhiko*; Sakaki, Hironao; Takahashi, Hiroki; Kawase, Masato; Kikuzawa, Nobuhiro

JAEA-Testing 2010-004, 34 Pages, 2011/02

JAEA-Testing-2010-004.pdf:0.81MB

J-PARC accelerator devices are controlled by the use of the software called EPICS. The unique name called an EPICS record is given to a control signal and data acquisition, Accelerator device control are achieved using the EPICS record. The requirement for the EPICS record name is 2 points; (1) no overlap of the EPICS record name, (2) the control contents can be easily imagined from the EPICS record name. To manage the EPICS record using relational database for the information management of the accelerator device in J-PARC, it is required to compose that a mechanical process can be performed easily. It was necessary to standardize the EPICS record name and the EPICS record structure to achieve these requirements. Therefore, we have formulated a guideline called "EPICS record naming conventions" to decide to an EPICS record name uniquely and standardization.

Journal Articles

Reconstruction of the 2-dimensitonal beam profile at longitudinal phase space with tomography method in J-PARC RCS and MR

Yoshimoto, Masahiro; Tamura, Fumihiko; Yamamoto, Masanobu; Yoshii, Masahito*; Omori, Chihiro*; Hayashi, Naoki; Kawase, Masato; Watanabe, Kazuhiko*; Yoshikawa, Muneyoshi*

Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM), p.737 - 740, 2010/03

The longitudinal phase space tomography, which was evolved to retrieve the two-dimensional beam distribution in the longitudinal phase space with computer tomography algorithms, is very useful diagnostic tool in the accelerator domain. The simple reconstruction tool was developed for the J-PARC RCS and MR with the convolution back projection method for the beam storage mode. On the assumption that the longitudinal profiles should not be disturbed for one period of the synchrotron oscillation, such two-dimensional profiles can be reconstructed easily from one-dimensional bunch beam profiles, which are measured for every turn by the wall current monitor.

Journal Articles

Longitudinal phase space tomography at J-PARC RCS

Yoshimoto, Masahiro; Tamura, Fumihiko; Yamamoto, Masanobu; Yoshii, Masahito*; Hayashi, Naoki; Kawase, Masato; Watanabe, Kazuhiko*; Yoshikawa, Hirokazu*

Proceedings of 2009 Particle Accelerator Conference (PAC '09) (DVD-ROM), p.3358 - 3360, 2009/05

The longitudinal phase space tomography, which was evolved to retrieve the two-dimensional beam distribution in the longitudinal phase space with computer tomography algorithms, is very useful diagnostic tool in the accelerator domain. The simple reconstruction tool was developed for the J-PARC RCS with the convolution back projection method for the beam storage mode. On the assumption that the longitudinal profiles should not be disturbed for one period of the synchrotron oscillation, such two-dimensional profiles can be reconstructed easily from one-dimensional bunch beam profiles, which are measured for every turn by the wall current monitor.

Journal Articles

Development of J-PARC linac/RCS MPS sub system

Suzuki, Takahiro; Yoshikawa, Hiroshi; Sakaki, Hironao; Takahashi, Hiroki; Ito, Yuichi; Kato, Yuko; Kawase, Masato; Ishiyama, Tatsuya; Fukuta, Shimpei*; Watanabe, Kazuhiko*

Proceedings of 5th Annual Meeting of Particle Accelerator Society of Japan and 33rd Linear Accelerator Meeting in Japan (CD-ROM), p.84 - 86, 2008/00

no abstracts in English

Journal Articles

Current status of the control system for J-PARC accelerator complex

Yoshikawa, Hiroshi; Sakaki, Hironao; Sako, Hiroyuki; Takahashi, Hiroki; Shen, G.; Kato, Yuko; Ito, Yuichi; Ikeda, Hiroshi*; Ishiyama, Tatsuya*; Tsuchiya, Hitoshi*; et al.

Proceedings of International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS '07) (CD-ROM), p.62 - 64, 2007/10

J-PARC is a large scale facility of the proton accelerators for the multi-purpose of scientific researches in Japan. This facility consists of three accelerators and three experimental stations. Now, J-PARC is under construction, and LINAC is operated for one year, 3GeV synchrotron has just started the commissioning in this October the 1st. The completion of this facility will be next summer. The control system of accelerators established fundamental performance for the initial commissioning. The most important requirement to the control system of this facility is to minimize the activation of accelerator devices. In this paper, we show that the performances of each layer of this control system have been achieved in the initial stage.

Journal Articles

Synthesis of fault trees in sequeutial control systems; Basic algorithm and its application

Suzuki, Kazuhiko*; *; *; Watanabe, Norio; ;

Shisutemu To Seigyo, 30(2), p.109 - 119, 1986/00

no abstracts in English

11 (Records 1-11 displayed on this page)
  • 1