HIRFL-CSR电子冷却装置电子枪的参数测试

Character and Test of Electron Gun for HIRFL-CSR Electron Cooler

摘要: 在用实心电子束对离子进行冷却过程中，束流累积会增强电子离子重组概率和空间电荷效应而引起束流损失。针对这个问题，HIRFL-CSR电子冷却装置采用了一种能够产生从实心到空心电子束且电子束密度连续可调的特殊电子枪设计。本文介绍电子枪的结构及工作特点，给出一些主要参数的实验结果，并通过理论计算分析了用空心电子束进行冷却的优点。

Abstract: Due to the strong recombination between electrons and cooled ions in the center of beam and the transversal instability of beam aroused by over cooling, ions lose seriously in cooling intensive ion beams with a solid electron beam. To reduce this loss, a special electron gun was adopted for HIRFL-CSR electron cooling device, of which the profile and density distribution of electron beam can be adjusted by varying the voltages of control electrode and anode. Electron beams from solid to hollow are obtained. Analysis in theory and experimental results are presented.