Development of new production target at J-PARC HADRON experimental facility (2)

We have developed a new production target at J-PARC hadron experimental facility. It consists of gold, copper, and stainless-steel pipes, and is indirectly cooled by water. Although this structure is almost same as the current production target, the cooling efficiency is improved by increasing the number of the copper cooling blocks. We performed an elastic-plastic analysis for the evaluation of the thermal strength of the new target using the results of tensile tests of the bulk gold. By comparing the result of the analysis to the allowable stress for each type of stress, it was found that the new target is capable of the beam power of 90 kW in maximum in the case of the 5.52-s spill cycle. (author)