Di Mitri Simone, Barletta William, Bianco Anna, Cudin Ivan, Diviacco Bruno, Raimondi Lorenzo, Spampinati Simone, Spezzani Carlo, Masciovecchio Claudio
Elettra - Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, Italy.
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA.
J Synchrotron Radiat. 2019 Sep 1;26(Pt 5):1523-1538. doi: 10.1107/S1600577519009901. Epub 2019 Aug 27.
Laser-slicing at a diffraction-limited storage ring light source in the soft X-ray region is investigated with theoretical and numerical modelling. It turns out that the slicing efficiency is favoured by the ultra-low beam emittance, and that slicing can be implemented without interference to the standard multi-bunch operation. Spatial and spectral separation of the sub-picosecond radiation pulse from a hundreds of picosecond-long background is achieved by virtue of 1:1 imaging of the radiation source. The spectral separation is enhanced when the radiator is a transverse gradient undulator. The proposed configuration applied to the Elettra 2.0 six-bend achromatic lattice envisages total slicing efficiency as high as 10, one order of magnitude larger than the demonstrated state-of-the-art, at the expense of pulse durations as long as 0.4 ps FWHM and average laser power as high as ∼40 W.
通过理论和数值模拟研究了软X射线区域衍射极限存储环光源处的激光切片。结果表明，超低束发射度有利于提高切片效率，并且切片可以在不干扰标准多束团运行的情况下实现。借助辐射源的1:1成像，实现了亚皮秒辐射脉冲与数百皮秒长背景的空间和光谱分离。当辐射器为横向渐变波荡器时，光谱分离得到增强。应用于Elettra 2.0六弯消色差晶格的提议配置设想总切片效率高达10，比已证明的现有技术高出一个数量级，但代价是脉冲持续时间长达0.4 ps FWHM，平均激光功率高达约40 W。
