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Journal Articles

Analysis of interlocked events based on beam instrumentation data at J-PARC Linac and RCS

Hayashi, Naoki; Hatakeyama, Shuichiro; Miura, Akihiko; Yoshimoto, Masahiro; Futatsukawa, Kenta*; Miyao, Tomoaki*

Proceedings of 7th International Beam Instrumentation Conference (IBIC 2018) (Internet), p.219 - 223, 2019/01

J-PARC is a multi-purpose facility. Accelerator stability is the one of important issues for users of this facility. To realize stable operation, we must collect data on interlocked events and analyze these data to determine the reasons for the occurrence of such events. In J-PARC Linac, data of interlocked events have been recorded using several some beam loss monitors and current monitors, and these data have been are analyzed and classified. In J-PARC RCS, new instrumentation is being introduced to obtain beam position. We discuss the present status and future plans related to this subject.

Oral presentation

Development of secondary particles detection system with stilbene organic scintillator in J-PARC RCS

Yoshimoto, Masahiro; Okabe, Kota; Kinsho, Michikazu

no journal, , 

In the J-PARC RCS, 400 MeV H$$^{-}$$ beams from the LINAC are injected to the stripper foils so that the most of beams are converted to protons. The stripper foil is irradiated not only by the injected H$$^{-}$$ beams but also by the circulating protons. The high energy and intense beam irradiation into the foil generates secondary neutrons and protons via nuclear reactions. These secondary particles cause high residual activation around the stripper foil. To measure the secondary particles from the stripper foil, the particle detector system is required to discriminate among proton, neutrons and $$gamma$$ rays. Then, we develop the detector system combining a stilbene organic scintillator and a plastic scintillator. The stilbene scintillator can discriminate $$gamma$$ rays and other particles (protons and neutrons) with the Pulse Shape Discrimination (PSD) function. Furthermore, it can separate protons from neutrons by using the plastic scintillator which is set on the front of the stilbene scintillator. In this presentation, we report the PSD performance test of the stilbene scintillator in the utility tunnel in the RCS.

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