LCLS soft x-ray imager mirrors and their performance

摘要: Soft X-ray imager mirrors have been designed, calibrated and fabricated at Lawrence Livermore National Laboratory characterized the Advanced Light Source for their performance between 200 1300 eV. The are coated with a multilayer coating consisting of 70 bilayers W/ SiC. to reflect 22.5 deg from grazing angle 1.50 nm wavelength width reflectivity peak should be least 1.3%. Also, non-reflective elsewhere. Our design was optimized satisfy these requirements. is very challenging since individual layer thicknesses need less than 1 thick reproducibility crucial. To minimize second harmonic we designed {Gamma} = 0.5 (W SiC same). This way end up mirror that has only 1st 3rd as shown in Figure 1. suppress outside first used our novel approach, an antireflective coating. Modeling predicted substantial reduction reflectivity, especially lower energies experimental results soft x-ray measured atmore » ALS 2 (log linear scale). energy range over which limited by beamline hardware. plot compilation about six scans different ranges using gratings, filters order sorter positions. 1.505 4.3% 0.028 or 1.8%, satisfying specs on width. other important specification overall low (except harmonic). We demonstrated this applied mirrors. application also reduces 8.23% 4.30%, agreement modeling results. As 3 substantially suppresses 800 eV.« less