论文标题
本地功率耦合作为高梯度分解性能的预测指标
Local power coupling as a predictor of high-gradient breakdown performance
论文作者
论文摘要
提出了一种预测射频加速结构高梯度性能的新数量。该数量是动机，得出的，并与早期的高梯度限制和实验进行了比较。这种新方法将新生的RF分解模拟为携带电流天线，并计算天线与RF电源的耦合。借助电子发射模型来描述新生的崩溃，天线模型描述了分解如何在任何给定的结构几何形状中充分发展局部表面电场。对于应用此方法的结构几何形状，发现计算出的负载电场与观察到的空间崩溃分布相关，并为不同几何形状之间的最大崩溃限制的加速梯度提供了一致的值。
A novel quantity for predicting the high-gradient performance of radio frequency accelerating structures is presented. The quantity is motivated, derived and compared with earlier high-gradient limits and experiments. This new method models a nascent RF breakdown as a current-carrying antenna and calculates the coupling of the antenna to an RF power source. With the help of an electron emission model to describe a nascent breakdown, the antenna model describes how a breakdown modifies the local surface electric field before it fully develops in any given structure geometry. For the structure geometries that this method was applied to, it was found that the calculated breakdown-loaded electric field was well-correlated with observed spatial breakdown distributions, and gave consistent values for the maximum breakdown-limited accelerating gradient between different geometries.
