SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, Calfornia 94025, USA.
Phys Rev Lett. 2018 Jun 29;120(26):264801. doi: 10.1103/PhysRevLett.120.264801.
We demonstrate a novel multistage amplification scheme for self-amplified spontaneous-emission free electron lasers for the production of few femtosecond pulses with very high power in the soft x-ray regime. The scheme uses the fresh-slice technique to produce an x-ray pulse on the bunch tail, subsequently amplified in downstream undulator sections by fresh electrons. With three-stages amplification, x-ray pulses with an energy of hundreds of microjoules are produced in few femtoseconds. For single-spike spectra x-ray pulses the pulse power is increased more than an order of magnitude compared to other techniques in the same wavelength range.
我们展示了一种新颖的多阶段放大方案，用于自放大自发辐射自由电子激光器，以在软 X 射线区域产生具有极高功率的少飞秒脉冲。该方案使用新鲜切片技术在束尾产生 X 射线脉冲，随后通过新鲜电子在下游波荡器段中进行放大。通过三级放大，在几飞秒内产生了数百微焦耳的 X 射线脉冲。对于单尖峰光谱 X 射线脉冲，与同一波长范围内的其他技术相比，脉冲功率提高了一个数量级以上。
