2015 年 12 巻 1 号 p. 31-33
In order to remove problems induced by serious accelerator activation around the stripping foil, J-PARC RCS should be converted to a 3-GeV compressor ring, installing laser stripping. Activation due to nuclear scattering by stripping foil seems to be as serious as anticipated at the MW beam power level. As the beam loss due to nuclear scattering is unavoidable, foil stripping should be replaced to laser stripping at the most fruitful injection energy of H- beam that is 3-GeV, upgrading the linac energy.