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来自光源注入器的高亮度光束:先进的光子源低能波荡器测试线直线加速器

High-Brightness Beams from a Light Source Injector: The Advanced Photon Source Low-Energy Undulator Test Line Linac

G. Travish, S. Biedron, M. Borland, M. Hahne, K. Harkay, J. W. Lewellen, A. Lumpkin, S. Milton, N. Sereno

摘要:

利用现有的直线加速器,特别是光源注入器,进行自由电子激光(FEL)实验变得越来越普遍,这是因为人们希望在更短的波长下测试自由电子激光。高增益自由电子激光器所要求的高亮度、高电流束流,使大多数现有的直线加速器在设计上无法满足其技术要求。此外,需要专门的诊断,特别是拍摄到拍摄的数据采集,需要大量的修改和升级传统的直线加速器。为了产生和表征高亮度光束,对先进光子源(APS)注入器直线加速器进行了改进。具体地说,努力已被定向在产生光束中使用的低能量波荡器测试线(LEUTL)自由电子激光在支持第四代光源的研究。本文介绍了530 nm自由电子激光器自放大自发发射(SASE)运行的直线加速器技术和诊断能力的改进。最近的结果,包括技术系统的改进和电子束测量技术的细节,将进行讨论。直线加速器能够将束流加速到650 MeV以上。使用的标称自由电子激光束参数如下:217 MeV能量; 0.1-0.2%均方根能量扩展; 4-8 μ m归一化均方根发射度; 80-120 A峰值电流,来自0.2-0.7 nC电荷,2-7 ps FWHM聚束。

英文摘要:

The use of existing linacs, and in particular light source injectors, for free-electron laser (FEL) experiments is becoming more common due to the desire to test FELs at ever shorter wavelengths. The high-brightness, high-current beams required by high-gain FELs impose technical specifications that most existing linacs were not designed to meet. Moreover, the need for specialized diagnostics, especially shot-to-shot data acquisition, demands substantial modification and upgrade of conventional linacs. Improvements have been made to the Advanced Photon Source (APS) injector linac in order to produce and characterize high-brightness beams. Specifically, effort has been directed at generating beams suitable for use in the low-energy undulator test line (LEUTL) FEL in support of fourth-generation light source research. The enhancements to the linac technical and diagnostic capabilities that allowed for self-amplified spontaneous emission (SASE) operation of the FEL at 530 nm are described. Recent results, including details on technical systems improvements and electron beam measurement techniques, will be discussed. The linac is capable of accelerating beams to over 650 MeV. The nominal FEL beam parameters used are as follows: 217 MeV energy; 0.1-0.2% rms energy spread; 4-8 um normalized rms emittance; 80-120 A peak current from a 0.2-0.7 nC charge at a 2-7 ps FWHM bunch.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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