Ultra-Short Electron and Radiation Pulses in Self-Amplified Spontaneous Emission Free Electron Lasers

该提案要求支持一个以大学为基础的物理加速器研究与开发（R&amp；D）计划，该计划旨在解决实验自由电子激光器和高亮度光束物理的几个机会。这些机会来自两个方面：(1)加州大学洛杉矶分校为BNL的加速器测试设施（ATF）建造的磁性减速弯压缩机的完成和即将调试；(2)在ATF重新启动可见红外SASE放大器（VISA）自放大自发发射自由电子激光器（SASE FEL）。拟议的实验计划将允许这次合作研究使用chicane压缩产生超短电子束的物理学，以及从SASE FEL过程中产生亚皮秒（ps）辐射脉冲。这些主题是当今束物理的前沿，并为基于大学的学术研究提供了丰富的背景。这些建议的研究对于目前使用SASE FELs的第四代x射线光源的开发至关重要，例如斯坦福大学和德国汉堡大学的研究。此外，它们还影响高平均功率的FELs、基于能量回收直线加速器（ERL）的光源系统、高能物理线性对撞机和先进的（基于激光和等离子体的）加速器。这些研究对于x射线SASE自由电子激光器的发展至关重要，因为所测试的物理系统是共享的：高亮度电子注入器、亚ps压缩器、狗腿传输和高度优化的波动器。这种综合方法的发展将解决高亮度光束辐射生产中更复杂的问题，这将大大有助于为x射线SASE FEL和其他尖端加速器系统奠定科学基础。

This proposal requests support for a university-based Physics Accelerator Research and Development (R&D) program designed to address several opportunities in experimental free-electron lasers and high brightness beam physics. These opportunities have arisen from two sources: (1) the completion and upcoming commissioning of a magnetic chicane compressor built at UCLA for the Accelerator Test Facility (ATF) at BNL; and (2) the restart of the Visible to Infrared SASE Amplifier (VISA) self-amplified spontaneous emission free electron laser (SASE FEL) at the ATF. The proposed experimental program will allow this collaboration to investigate the physics of ultra-short electron beam production using chicane compression, and the generation of sub-picosecond (ps) radiation pulses from the SASE FEL process. These topics are at the frontier of beam physics today, and provide a rich context for university-based scholarly research. The proposed investigations are critical to the current development of 4th generation X-ray light sources which utilize SASE FELs, such as those at Stanford and DESY (Hamburg). In addition, they also impact high average power FELs, energy recovery linac (ERL) based light source systems, high energy physics linear colliders, and advanced (laser and plasma based) accelerators. These investigations are of critical importance to the development of the X-ray SASE FEL as the physical systems under test are shared: high brightness electron injector, sub-ps compressor, dogleg transport, and highly optimized undulator. The development of this comprehensive approach to address more sophisticated issues in high brightness beam-based radiation production will significantly aid in laying the scientific basis for the X-ray SASE FEL and other cutting edge accelerator systems.