Abstract

J‐PARC Hadron Experimental Facility is designed as a multi‐purpose experimental facility for particle and nuclear physics experiments using high‐intensity secondary particles (Kaons, pions, and so on) produced by 50 GeV‐15 μA (750 kW) primary proton beams. Currently, three secondary beam lines (K 1.8 BR, K 1.8, and KL) have been constructed. The first beam extraction from 50 GeV proton synchrotron was on January 27th, 2009, and the beam commissioning of the primary and secondary beam lines are on going. The present article reports construction status and beam commissioning of Hadron Experimental Facility in detail.

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