High intensity beam operation of J-PARC RCS with minimum beam loss

J-PARC RCSにおけるビーム損失を最小限に抑えた大強度ビーム運用

Saha, P. K.   ; 原田 寛之  ; 菖蒲田 義博   ; 田村 文彦   ; 沖田 英史  ; 岡部 晃大  ; 仲野谷 孝充  ; 畠山 衆一郎; 守屋 克洋  ; 高柳 智弘   ; 發知 英明*

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

In this research, numerical simulation studies and beam tests were performed to minimize the beam loss at high intensity operation of J-PARC RCS. The beam loss usually increases non-linearly with respect to the beam power ramp up at high-intensity. The longitudinal and transverse injection painting used for space charge mitigation at a lower beam energy are optimized to produce a further uniform beam distribution to realize further space charge mitigation. The beam loss at the present operation at a net beam power of nearly 850 kW to the MLF has been kept to a minimum level to achieve a stable user operation. The beam loss at 1 MW beam power has also been sufficiently reduced to remain only 0.05% which is dominated by the unavoidable foil scattering beam loss.