摘要
A superconducting quarter-wave resonator （QWR） of frequency=162.5 MHz andβ=0.085 （β=v/c） has been designed at Peking University. The multipacting （MP） simulation and analysis for the QWR with CST Particle Studio has been performed. The simulation results reveal that there is no sign of MP with its normal operating accelerating gradients in the range of 6-8 MV/m. The accelerating gradient range that may incur MP is from about 1.4 to 3.2 MV/m, and the places where MP may be encountered are mainly located at the top part of the QWR. So the effect of different top geometries on MP has also been studied in depth. Our results show that an inward convex round roof is better than other round roofs, and plane roofs have an advantage over round roofs on the suppression of MP in general. While considering the optimization of its electromagnetic （EM） design, our initial designed model is also acceptable.
A superconducting quarter-wave resonator （QWR） of frequency=162.5 MHz andβ=0.085 （β=v/c） has been designed at Peking University. The multipacting （MP） simulation and analysis for the QWR with CST Particle Studio has been performed. The simulation results reveal that there is no sign of MP with its normal operating accelerating gradients in the range of 6-8 MV/m. The accelerating gradient range that may incur MP is from about 1.4 to 3.2 MV/m, and the places where MP may be encountered are mainly located at the top part of the QWR. So the effect of different top geometries on MP has also been studied in depth. Our results show that an inward convex round roof is better than other round roofs, and plane roofs have an advantage over round roofs on the suppression of MP in general. While considering the optimization of its electromagnetic （EM） design, our initial designed model is also acceptable.
基金
Supported by Major Research Plan of National Natural Science Foundation of China (91026001)
