3D thermal-fluid coupled analysis for 81.25 MHz RFQ accelerator

The thermal stability of the radio frequency quadrupole (RFQ) is an important concern during commissioning. The cooling water takes away the power dissipated on the RFQ internal surface to maintain the thermal stability and limit the structural deformation. In this paper, the thermal-fluid coupled analysis of the RFQ is described and 3D temperature distribution of the RFQ cavity structure is given. The method of adjusting the water temperature is determined through analysis. The heat transfer coefficient for the cooling channels and the outlet water temperature about the water cooling system are obtained. A comparison of the results in simulation and experiment is presented. The cooling system can meet the requirements of RFQ operating.