Two-color operation of a free-electron laser with a tilted beam.
Two-color operation of a free-electron laser with a tilted beam.
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DOI：
10.1107/s1600577516007189
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发表时间：
2016-07
影响因子：
2.5
通讯作者：
S. Reiche;E. Prat
中科院分区：
文献类型：
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作者：
S. Reiche;E. Prat
随着自由电子激光器（FELs）作为用户设备的成功运行，对具有可变光子能量和时间分离的双光子脉冲实验的需求日益增长。提出了一种具有变间隙控制和波束中间有延迟弯道的波动器结构。具有横向倾斜的注入电子束只会对接近波动轴的部分产生FEL辐射。这允许在重新排列和延迟电子束之后，束束的不同部分被用来产生第二个FEL脉冲。该方法提供了光子能量和延迟的独立控制。对于瑞士自由电子激光器软x射线光束线Athos的参数，光子能量调谐范围为5倍，两个脉冲之间的延迟可调，从-50到950 fs。
With the successful operation of free-electron lasers (FELs) as user facilities there has been a growing demand for experiments with two photon pulses with variable photon energy and time separation. A configuration of an undulator with variable-gap control and a delaying chicane in the middle of the beamline is proposed. An injected electron beam with a transverse tilt will only yield FEL radiation for the parts which are close to the undulator axis. This allows, after re-aligning and delaying the electron beam, a different part of the bunch to be used to produce a second FEL pulse. This method offers independent control in photon energy and delay. For the parameters of the soft X-ray beamline Athos at the SwissFEL facility the photon energy tuning range is a factor of five with an adjustable delay between the two pulses from -50 to 950 fs.