Latest performance of the J-PARC 3-GeV RCS and after proton scenario for DeeMe experiment at 1 MW operation

Saha, P. K.   ; Yamamoto, Kazami   ; Kinsho, Michikazu  ; Hotchi, Hideaki  ; Aoki, Masaharu*

The 3-GeV RCS of J-PARC is operating well with a beam power of 300 kW and also achieved an equivalent beam power of 540 kW in recent studies. It is simply demonstrated that the designed beam power of 1 MW (8.3310 ppp) or even more is thus achievable with an upgraded 400 MeV injection as the space-charge force is sufficiently less dominated as compared to the present 181 MeV injection. The extraction system is also very stable and there exists almost no issues even for 1 MW operation. The DeeMe experiment is proposed for searching muon-electron conversion in the nuclear field at sensitivity of 10 by fully utilizing the pulsed proton beam extracted from the RCS. The after protons from the RCS should be negligibly small in order to realize such a high sensitivity. For the present beam power, measured after protons are found to meets DeeMe requirement and has also been estimated to stay almost in the same level even for 1 MW beam.