SXFEL阻抗壁尾场对束流相空间畸变的影响  

Influence of SXFEL resistive wall wakefield on beam phase space distortion

作　　者：龚有为 程文才 赵明华[1] 李烜 谷端 张猛 Gong Youwei;Cheng Wencai;Zhao Minghua;Li Xuan;Gu Duan;Zhang Meng(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]中国科学院上海高等研究院,上海201210

出　　处：《强激光与粒子束》2022年第6期90-95,共6页High Power Laser and Particle Beams

摘　　要：X射线自由电子激光器(FEL)由于其超高亮度、超短脉冲等特点,在世界范围内得到广泛应用。基于尾流场理论,我们计算了上海X射线自由电子激光器(SXFEL)中从直线加速器出口到波荡器末端,束流在245 m不锈钢传输线和波荡器中的阻抗壁尾场。通过对两种不同的阻抗壁尾场的叠加,发现将导致束流纵向相空间的畸变。在SXFEL上进行束流物理的实验,并得到与理论预测非常吻合的实验结果。结合之前对主要直线加速器部分的详细模拟和实验研究,为后续FEL整体束流优化提供了参考。X-ray free-electron laser(XFEL),due to its ultra-high brightness,ultra-short pulse and other characteristics,has been built worldwide.Based on the theory of wakefield,we calculate the resistive wall wakefield from the linear accelerator(linac)exit to the end of the undulator in Shanghai X-ray free electron laser(SXFEL)with bunch traveling through the 245 m stainless steel transfer line and copper beamline in undulator.Then we analyze the resistive wall wakefields which eventually lead to the distortion of the longitudinal phase space within the bunch.Finally,the theoretical predictions of influence of resistive wall wakefield are compared with experiment results on SXFEL,which shows great agreement.The detailed research provides a direction for subsequent FEL optimization.

关 键 词：上海软X射线自由电子激光 纵向相空间 阻抗壁尾场 能量分布畸变 

分 类 号：TL53[核科学技术—核技术及应用]