1304 高エネルギー加速器ターゲットの崩壊熱に関する研究

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High intense pulsed neutron beams are generated by nuclear spallation reaction at the target system in JPARC project. This paper describes thermal hydraulic designs of plate and rod targets to realize the validity and safety on the solid target. The neutronic performance of each target was compared with the average densities of the designed targets. The density of the plate was highest, that of the rod was the second and that of mercury was lowest at 1MW. Moreover, considerations about the decay heat of a target were performed. Since the decay heat of tantalum is high and its attenuation rate is small, the tungsten plate target HIPed with tantalum was required special cooling methods during the target exchange. A present most realizable target is the tungsten rod array target sheathed by stainless steel or zircalloy.