Study for Space Charge effect in tune space at J-PARC MR

J-PARC MR has been operated at tune operating point ( x,  y)=(22.40, 20.75). Tune spread due to space charge force makes overlap a sum resonance on linear x-y coupling  x+ y=43. Changing the operating point is one of possible measure to avoid the resonance. We study beam loss due to space charge force in various tune operating point.