首页> 外文会议>2018 IEEE Advanced Accelerator Concepts Workshop >Free Electron Lasers Based on Multi-Stage Tapered RF Wigglers
【24h】

Free Electron Lasers Based on Multi-Stage Tapered RF Wigglers

机译:基于多级锥形射频摆动器的免费电子激光器

获取原文
获取原文并翻译 | 示例

摘要

We propose a high-efficiency regime of a “multi-stage” trapping in a Free Electron Laser (FEL). This FEL scheme uses strongly tapered flying radio frequency (RF) undulator sections to be fed by short (nanosecond) gigawatt-power microwave pulses produced by existing Backward Wave Oscillators (BWOs). In this regime, phase locking of the RF sources is not necessary. The proposed method promises an efficiency at level of several percents in FELs driven by modern laser-plasma accelerators producing bunches with ~1 % energy spread. Low-power tests with 30 GHz undulator prototypes have shown that up to 50% tapering of the periodicity is obtainable. Multi-stage tapering is also appealing for X-ray FEL oscillators (XFELO). An XFELO, consisted of not tapered and tapered undulators, can have self-modulated Q-factor of a cavity. This allows XFELO to start up faster and at the same time to provide a high efficiency in steady state regime. Multi-staging might also improve an XFELO concept where the first uniform undulator is inserted in an optical cavity, but the second external undulator works in Self-Amplified Spontaneous Emission (SASE) regime consuming the microbunched electron beam generated by the first undulator. The idea is based on the use of smart reflecting mirrors in a cavity with complicated shapes. These reflectors due to a proper design produce an eigenmode with zero-field in the center of one of mirrors so that electrons can be out-coupled flying straight through a hole in this mirror.
机译:我们提出了一种高效的自由电子激光器(FEL)中“多阶段”陷获的方案。该FEL方案使用强锥形的飞行射频(RF)波动器部分,由现有的后向波振荡器(BWO)产生的短(纳秒)吉瓦功率微波脉冲供电。在这种情况下,不需要射频源的锁相。所提出的方法有望在由现代激光等离子加速器驱动的FEL中产生几%的效率,从而产生能量散布约为1%的束。使用30 GHz波动器原型进行的低功率测试表明,可以获得高达50%的周期渐缩。 X射线FEL振荡器(XFELO)也很有吸引力。由非锥形和锥形波动器组成的XFELO可以具有腔的自调制Q因子。这使XFELO可以更快地启动,并同时在稳态状态下提供高效率。多阶段也可能会改进XFELO的概念,其中将第一均匀波荡器插入光腔中,但是第二外部波荡器以自放大自发发射(SASE)方式工作,消耗了由第一波荡器产生的微束电子束。这个想法是基于在形状复杂的腔体中使用智能反射镜。这些反射器由于设计合理而在其中一个反射镜的中心产生了零场的本征模,因此电子可以通过该反射镜中的一个孔直接飞出耦合。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号