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C-ADS注入器Ⅱ的RFQ射频系统是该强流加速器的关键一环,它通过两台完全一样的耦合器为一台四边形四翼型RFQ提供和传送功率。该射频系统在设计之初就考虑为10mA连续束流而进行特殊优化,从功率源、耦合器和功率传输系统几个方面对其进行详细介绍,尤其是针对CW模式下的系统稳定运行以及设备可靠性等方面进行的特殊考虑和模拟方法。该系统已经在2015年通过了10mA连续束的测试,证实了该射频系统的设计和调试符合物理的实验需求。特别阐述了该系统中一种新的碗型陶瓷窗耦合器的设计思路和一种无环形器情况下的特殊的耦合系数调谐方法,同时推导了双端口耦合的计算方法的具体设置过程。
The RFQ RF system from C-ADS Injector II is a key element of this high-flow accelerator, which provides and delivers power to a quadrilateral, four-air RFQ via two identical couplers. The RF system was designed from the beginning of the 10mA continuous beam for special optimization, from the power source, coupler and power transmission system in several aspects of its detailed description, especially for CW mode stable operation of the system and equipment Reliability and other aspects of the special considerations and simulation methods. The system passed the 10mA continuous beam test in 2015, confirming that the RF system is designed and debugged to meet the experimental needs of the physics. In particular, a new design concept of a bowl-shaped ceramic window coupler and a method of tuning the coupling coefficient without a circulator are described in detail. Meanwhile, the specific procedure for the calculation of the two-port coupling is derived.