中国散裂中子源RFQ的热分析

射频四级场(RFQ)加速器的水冷具有以下两种功用: 首先它可以把射频场发热带走, 维持RFQ腔的热稳定性及限制RFQ强体形变幅度; 其次, 当RFQ失谐时, 它还可以用来进行RFQ的调谐, 而同时又基本不影响RFQ的射频场分布. 由于RFQ粒子的传输效率对射频场的分布极其敏感, 在RFQ的运行中不再采用传统的用调谐器对RFQ进行调谐的方法. 本文通过热分析, 确定了RFQ加速器的水冷管道的数量和布局及最佳工作水温; 确定了RFQ失谐时, 如何利用水温变化来对RFQ进行调谐的方法.

Thermal Analysis of CSNS RFQ

Water-cooling serves two functions in an RFQ.One is to take away the power dissipated on the inside surface of the RFQ by the RF field to maintain the thermal stability and to limit the deformation of RFQ.The other is to be used to tune the RFQ basically without effecting the field distribution when the RFQ is out of resonance,since the beam transmission of RFQ is very sensitive to the field profile,the ordinary frequency tuning method by the movable tuners is no more adopted in an RFQ operation.The cooling water channel position and number,as well as the optimum cooling water temperature are determined through thermal analysis.In addition,the tuning method by adjusting the cooling water temperature is determined when the RFQ is out of resonance.