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首页> 外文会议>Advances in X-ray free-electron lasers II: instrumentation >Longitudinal bunch profile diagnostics with coherent radiation at FLASH
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Longitudinal bunch profile diagnostics with coherent radiation at FLASH

机译：纵向束轮廓诊断，在FLASH具有相干辐射

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摘要

The required high peak current in free-electron lasers (FELs) is realized by longitudinal compression of the electron bunches to sub-picosecond length. A novel in-vacuum polychromator (CRISP4) has been developed for measuring coherent radiation in the THz and infrared range. The polychromator is equipped with five consecutive dispersion gratings and 120 parallel readout channels. It can be operated either in short (5-44 μm) or in long wavelength mode (45-430 μm). Fast parallel readout permits the monitoring of coherent radiation from single electron bunches. Due to the large wavelength range covered and the absolute calibration of the device, Kramers-Kronig based phase retrieval allows to online reconstruct a longitudinal bunch profile from the measured coherent radiation spectrum. The device is used as a bunch length monitoring and tuning tool during routine operation at the Free-electron Laser in Hamburg (FLASH). Comparative measurements with the transverse deflecting structure show excellent agreement of both methods.
机译：自由电子激光器（FEL）中所需的高峰值电流是通过将电子束纵向压缩到皮秒以下的长度来实现的。已开发出一种新型的真空多色仪（CRISP4），用于测量THz和红外范围内的相干辐射。多色仪配备了五个连续的色散光栅和120个平行的读出通道。它可以以短波长（5-44μm）或长波长模式（45-430μm）进行操作。快速的并行读出允许监视来自单个电子束的相干辐射。由于所覆盖的波长范围较大且设备进行了绝对校准，因此基于Kramers-Kronig的相位检索功能可从测得的相干辐射光谱在线重建纵向束轮廓。该设备在汉堡的自由电子激光器（FLASH）的常规操作中用作束长监测和调节工具。横向偏转结构的比较测量结果表明两种方法的一致性极好。

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