RFQ冷却聚束器中Mathieu参数q值的选取

Choose the Mathieu q Value for RFQ Cooler and Buncher

介绍了RFQ冷却聚束器约束和冷却离子的理论，采用国际上比较先进的真实相互作用势力模型进行蒙特卡洛模拟，得出RFQ冷却聚柬器的Mathieu参数q值的选取范围．结论是：无论在真空或者充气情况下，当Mathieu参数q大于0．908时，离子的运动都是不稳定的；在充气情况下，Mathieu参数q略小于0．908，离子运动已经不稳定．适合约束离子的最佳Mathieu参数q值的选取范围在0．3～0．5之间．

The paper introduced the theory for cool and constraint ions in RFQ cooler and buncher, use the international comparative advanced Realistic Interaction Potential model for Monte Carlo simulation with buffer gas filled in RFQ, concluded the Mathieu parameter q value range for RFQ cooler and buncher. The conclusion is that under vacuum or air circum- stances,when Mathieu parameter q is greater than 0.908,the movement of ions is unstable ; under the condition of air circumstances, when Mathieu parameter is slightly less than 0. 908 ,the ion movement has been unstable. The best Mathieu parameter q value for con- straint ions is 0. 3 to 0.5.