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Report No.

Achievement of low beam loss at high-intensity operation of J-PARC 3 GeV RCS

Saha, P. K.   ; Okabe, Kota  ; Nakanoya, Takamitsu  ; Yoshimoto, Masahiro  ; Shobuda, Yoshihiro   ; Harada, Hiroyuki  ; Tamura, Fumihiko   ; Okita, Hidefumi  ; Hatakeyama, Shuichiro; Moriya, Katsuhiro  ; Yamamoto, Kazami   ; Hotchi, Hideaki*

The RCS beam power for operation to the MLF has been increased to 800 kW recently. The total beam loss even at the designed 1 MW beam power has been well controlled, but the uncontrolled beam losses, especially those caused by the foil scattering of the circulating beam during multi-turn injection are still high and causes extremely high residual radiation at the injection area. To further minimizing such a beam loss, we have implemented a new approach by minimizing the injection beam size and using a smaller size stripper foil. A smaller foil reduces foil hitting of the circulating beam and the corresponding foil scattering uncontrolled beam losses. In addition, an optimized transverse painting area matching with a smaller injection beam also gives a smaller circulating beam emittance to reduce beam loss at the collimator section and its downstream. The corresponding residual radiation for operation at 700 kW beam power was measured to be significantly reduced at the injection area, collimator section and it's downstream. A smaller injection beam size was also tested at 1MW beam power and the residual beam loss is minimized to 0.01%, which is nearly 1/4 reduction from the previous 1 MW test operation in 2020.



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