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Report No.
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Results of 1-MW operation in J-PARC 3 GeV rapid cycling synchrotron

Yamamoto, Kazami  ; Yamamoto, Masanobu  ; Yamazaki, Yoshio; Nomura, Masahiro ; Suganuma, Kazuaki ; Fujirai, Kosuke; Kamiya, Junichiro  ; Hatakeyama, Shuichiro; Hotchi, Hideaki ; Yoshimoto, Masahiro ; Nakanoya, Takamitsu ; Tamura, Fumihiko  ; Saha, P. K.  ; Kinsho, Michikazu 

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.

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