在LCLS基线上增加用户访问的方法
Way to increase the user access at the LCLS baseline
摘要：
LCLS光束是为单个用户设计的，但基线波荡器足够长，可以同时为两个用户服务。为此，我们提出了一个由两个元素组成的设置：用于X射线束偏转的X射线反射镜对，和4米长的磁弯道，其在基线波荡器的中间为反射镜对安装创建偏移。可插入反射镜对可以在空间上分离在基线波荡器的第一半部和第二半部中生成的X射线束。自由电子激光放大过程的快速切换允许去激活波荡器的一半并激活波荡器的另一半。如在别处提出的，使用安装在LCLS基线波荡器上游的冲击器和波荡器的前半部分中的已经存在的校正器，可以将X射线束从一个用户快速切换到另一个用户。模拟结果表明，在同一个基线波荡器中，可以产生两束在0.8-8 keV光子能量范围内的饱和SASE X射线束。它可以为两个用户服务。我们的技术不干扰LCLS波荡器的基线操作模式。此外，磁弯道设置是非常灵活的，可以作为一个自我播种设置太多。我们目前的LCLS基线波荡器与SHAB的模拟结果。人们可以产生二次谐波和一次谐波的单色辐射。我们描述了一种有效的方式获得多用户操作在LCLS硬X射线自由电子激光。为此，提出了一种基于在布拉格反射几何结构中使用晶体的光子束分布系统。晶体偏转器的反射率可以通过用压电器件翻转晶体来足够快地切换。单色硬X射线可以分布在6个独立的实验室中，从而使6个用户能够在近距离和远距离的实验室中并行工作。
英文摘要：
The LCLS beam is meant for a single user, but the baseline undulator is long enough to serve two users simultaneously. To this end, we propose a setup composed of two elements: an X-ray mirrors pair for X-ray beam deflection, and a 4 m-long magnetic chicane, which creates an offset for mirrors pair installation in the middle of the baseline undulator. The insertable mirrors pair can separate spatially the X-ray beams generated in the first and in the second half of the baseline undulator. Rapid switching of the FEL amplification process allows deactivating one half and activating another half of the undulator. As proposed elsewhere, using a kicker installed upstream of the LCLS baseline undulator and an already existing corrector in the first half of the undulator, it is possible to rapidly switch the X-ray beam from one user to another. We present simulation results for the LCLS baseline, and show that it is possible to generate two saturated SASE X-ray beams in the whole 0.8-8 keV photon energy range in the same baseline undulator. These can serve two users. Our technique does not perturb the baseline mode of operation of the LCLS undulator. Also, the magnetic chicane setup is very flexible, and can be used as a self-seeding setup too. We present simulation results for the LCLS baseline undulator with SHAB. One can produce monochromatic radiation at the 2nd harmonic as well as at the 1st. We describe an efficient way for obtaining multi-user operation at the LCLS hard X-ray FEL. To this end, a photon beam distribution system based on the use of crystals in the Bragg reflection geometry is proposed. The reflectivity of crystal deflectors can be switched fast enough by flipping the crystals with piezoelectric devices. Monochromatic hard X-rays can then be distributed among 6 independent experiments, thereby enabling 6 users to work in parallel in the near and far experimental halls.
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