HIRFL-CSR主环电子冷却装置调试

Test Results of HIRFL-CSR Main Ring Electron Cooling Device

介绍了在HIRFL-CSR主环电子冷却装置上首次设计的能够产生空心电子束的电子枪阴极。在弯曲螺线管内采用了静电偏转电极,冷却段采用了高磁场平行度螺线管设计,在IMP与BINP的合作下完成了电子冷却装置,测量了电子束剖面及密度分布、冷却段磁场平行度、电子枪和收集器的性能,实验验证了静电偏转电极的优越性,调试结果表明实现了预期的设计目标。

Electron cooling device for HIRFL-CSR main ring has been completed under the cooperation between BINP and IMP. It has three distinctive characters. Variable profile electron beam can be produced by the electron gun, the size and density distribution of electron beam can be changed. The parallelism of the magnetic field in the cooling section achieves less than 1 ×10-5, in this case, the r.m.s angle deviations of the magnetic field line in horizontal and vertical direction are 7.838 × 10 and 8.044 × 10-6 respectively. The electron beam loss is reduced, the vacuum condition is improved, and the instability of the electron beam is suppressed becanse of using of electrostatic bending plate in the toroid. The beam profile and density distribution were measured in the testbench. The characters of the gun and collector were investigated. The main test results are presented in this paper.