Design of high power RF window for drift tube linac
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摘要: 为了研发中国散裂中子源(CSNS)漂移管直线加速器(DTL)的功率耦合器，在对常规波导窗结构进行改进的基础上，设计了一种新型高功率波导窗。利用微波仿真软件CST优化了波导窗的高频传输特性，并采用ANSYS分析了波导窗在通功率时的温升及热应力以防止陶瓷片破裂，结果表明,波导窗能传输的最大平均功率达到了800 kW。校核了波导窗抽真空时的机械强度，并对陶瓷窗高频打火进行初步讨论，结果表明，漂移管直线加速器入腔功率为2 MW，小于波导窗的临界输入功率2.355 MW，窗内打火的机率很小。Abstract: In order to develop a RF coupler for the drift tube linac of China Spallation Neutron Source, by improving the conventional RF window structure, we designed a new RF window of the RF coupler. High frequency characteristics of this window were optimized in CST. The calculations of the temperature rising and the thermal stress caused by the high power were performed to avoid the ceramic broken. The fundamental mechanism of the window under vacuum was investigated. Finally a preliminary discussion on the ARC phenomenon was made too. The results show that the in-put power 2 MW of the cavity is less than the critical value 2.355 MW, and the probability of strike arc is very small.
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Key words:
- RF window /
- RF coupler /
- drift tube linac /
- China Spallation Neutron Source
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