Development of a New Production Target at the J-PARC Hadron Experimental Facility

We have developed a new production target at the J-PARC Hadron Experimental Facility. The target is made of gold and is indirectly cooled by water through a copper block. Although this cooling structure is the same as that of the current production target, the cooling efficiency is improved by doubling the copper cooling block. We performed an elastic-plastic analysis for thermal-stress evaluation of the new target, using the tensile-test results of bulk gold. For each type of stress, we compared the results of the analysis to the allowable stress. It turns out that the new target is capable of a primary-proton beam power up to 90 kW for a 5.52-s repetition cycle. In this paper, the design and preparation of the new target are presented.