Preliminary study of electron beam wall loss in photocathode DC injectors
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摘要: 真空度被认为是影响GaAs阴极寿命的最重要参数之一，电子束在阴极附近的壁损失会导致真空度下降。基于高斯分布模型，研究了中国工程物理研究院自由电子激光相干强太赫兹源（FEL-THz）直流光阴极注入器电子束在束线管壁上的损失情况。通过理论分析、数值计算、束流动力学模拟、热力学分析及电子束初步出束实验研究，证明了FEL-THz电子束壁损失能达到W量级，必然引起真空度下降和阴极寿命缩短，这是目前限制出束的重要原因之一。研究表明，为维持电子束持续稳定工作，应将注入器阳极后的管道尺寸扩大到至少45 mm。
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关键词:
- 自由电子激光相干强太赫兹源 /
- 高斯分布 /
- 电子束壁损失 /
- GaAs阴极 /
- 量子效率
Abstract: Ultra-high vacuum (UHV) has been demonstrated as the most important condition for long lifetime GaAs photocathode. To create the UHV environment and extend the GaAs lifetime, the electron beam wall loss in DC injectors is studied in this paper. A DC injector is installed in free electron. laser THz (FEL-THz) facility in CAEP. The study is based on Gaussian distribution model. With theoretical analysis, numerical calculation, dynamic simulation, thermal simulation and prototype experiment discussion, this beam loss is proved to be a few watts, indicating that it is the main reason for vacuum and quantum efficiency loss, which will dramatically decline the beam-out time. Furthermore, the study also indicates that the tube diameter the after the anode should be at least 45 mm. 期刊类型引用(5)
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百度学术2. 郭嘉伟，贾凯，杨峰，彭春，汪晓聪，刘晓旭，韩聚洪，荣克鹏，安国斐，蔡和，王浟. 喷流冷却复合陶瓷薄片激光器的热特性仿真分析及实验研究（英文）. 光子学报. 2020(03): 7-15 . 百度学术3. 李国会，徐宏来，吴晶，杜应磊，向汝建，周志强，于益，胡平，向振佼，张越. 非稳腔薄片激光器腔内像差组合式主动校正技术. 中国激光. 2020(10): 30-37 . 百度学术4. 李隆，潘晓瑞，耿鹰鸽. LD端面抽运Nd:YAG微片热容激光器温度场. 激光与光电子学进展. 2017(12): 261-270 . 百度学术5. 邵娜，朱晓，朱广志，王牧，冯玙璠，黄彦. 碟片激光器晶体模块阵列射流冲击冷却的研究. 激光技术. 2016(05): 695-700 . 百度学术其他类型引用(2)
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