大功率CW FEL光电注入器中的RF耦合器
RF Couplers for Normal-Conducting Photoinjector of High-Power CW FEL
摘要：
大电流发射度补偿射频光注入器是实现大功率连续波自由电子激光的关键技术。一个正常的导电，2.5细胞π模式，700 MHz的CW RF光注入器，将用于演示目的的初步设计完成。这种光电注入器将能够将100 mA的电子束（在35 MHz的聚束重复率下，每聚束3 nC）加速到2.7 MeV，同时在摆动器处提供低于7 mm mrad的发射度。超过1兆瓦的射频功率将通过两个脊加载锥形波导馈入到光注入器腔。波导通过在厚壁中切割的“狗骨”虹膜耦合到腔。由于连续工作的光电注入器，耦合器虹膜的冷却是一个相当具有挑战性的热管理项目。本文介绍了一个详细的耦合器腔体系统，已执行的电磁建模的结果，以选择耦合器的设计，最大限度地减少虹膜加热，由于在其墙壁的RF功率损耗。
英文摘要：
A high-current emittance-compensated RF photoinjector is a key enabling technology for a high-power CW FEL. A preliminary design of a normal-conducting, 2.5-cell pi-mode, 700-MHz CW RF photoinjector that will be built for demonstration purposes, is completed. This photoinjector will be capable of accelerating a 100-mA electron beam (3 nC per bunch at 35 MHz bunch repetition rate) to 2.7 MeV while providing an emittance below 7 mm-mrad at the wiggler. More than 1 MW of RF power will be fed into the photoinjector cavity through two ridge-loaded tapered waveguides. The waveguides are coupled to the cavity by "dog-bone" irises cut in a thick wall. Due to CW operation of the photoinjector, the cooling of the coupler irises is a rather challenging thermal management project. This paper presents results of a detailed electromagnetic modeling of the coupler-cavity system, which has been performed to select the coupler design that minimizes the iris heating due to RF power loss in its walls.
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