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漂移管直线加速器(DTL)加工和安装的误差会导致腔内加速电场分布偏离设计值。为了补偿该偏差,通常在腔内安装调谐装置。同时,在腔内引入耦合杆周期结构,通过调节耦合杆与漂移管之间的间隙,可提高DTL腔内加速电场的稳定性。本文基于高频谐振腔理论和小球拉线测量技术,搭建了一套高精度电场测量系统。结合仿真模拟和实验,实现了中国散裂中子源(CSNS)DTL的加速电场和稳定性调谐,使得腔内实际加速电场分布与设计值相对偏差小于2%,谐振频率和电场稳定性均达到设计指标。
Errors in the fabrication and installation of drift tube linacs (DTLs) can cause the in-cavity acceleration electric field to deviate from the design values. To compensate for this deviation, tuning devices are usually installed in the chamber. At the same time, the periodic structure of the coupling rod is introduced into the cavity and the stability of the accelerating electric field in the DTL cavity can be improved by adjusting the gap between the coupling rod and the drift tube. In this paper, based on the theory of high-frequency resonant cavity and the technology of ball pull line measurement, a set of high-precision electric field measurement system is built. Combined with simulation and experiment, the accelerating electric field and stability tuning of DTNS in China spallation neutron source (CSNS) are realized, the relative deviation between the actual acceleration electric field distribution in the cavity and the designed value is less than 2%, and the resonance frequency and electric field stability reach Design specifications.