Upgrade Plan of J-PARC Main Ring

Abstract

The J-PARC Main Ring has provided high-intensity proton beams for the long-baseline neutrino oscillation experiment called T2K. The present beam power reaches 515 kW. The T2K experiment recently indicated the CP violation in the lepton sector. To increase the confidence level of the indication, we plan the upgrade of the J-PARC Main Ring to achieve a beam power of 1.3 MW. In this article, we describe not only the upgrade for 1.3 MW but also various activities which we have already done to achieve the present beam power.