Pressure and temperature fluctuation simulation of J-PARC cryogenic hydrogen system

[摘要] The J-PARC cryogenic hydrogen system provides supercritical cryogenic hydrogen to the moderators at a pressure of 1.5 MPa and temperature of 18 K and removes 3.8 kW of nuclear heat from the 1 MW proton beam operation. We prepared a heater for thermal compensation and an accumulator, with a bellows structure for volume control, to mitigate the pressure fluctuation caused by switching the proton beam on and off. In this study, a 1-D simulation code named DiSC-SH2 was developed to understand the propagation of pressure and temperature propagations through the hydrogen loop due to on and off switching of the proton beam. We confirmed that the simulated dynamic behaviors in the hydrogen loop for 300-kW and 500-kW proton beam operations agree well with the experimental data under the same conditions.

[发布机构] J-PARC Center, JAEA, Tokai-Ibaraki; 319-1195, Japan^1

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] 1-D simulation;Dynamic behaviors;Hydrogen system;Nuclear heat;Pressure and temperature;Pressure fluctuation;Supercritical;Thermal compensation