Silicon x‐ray analyzer crystals were microfabricated by dicing and etching 10.3 cm (4‐inch) diam, 1.35 mm thick, undoped float zone (111) silicon wafers. These analyzer crystals are intended for a beam line at the Advanced Photon Source synchrotron accelerator ring under construction at the Argonne National Laboratory. Parallel and perpendicular, 1 mm spaced grooves were cut on the silicon wafers using an automated dicing saw. The grooves were cut at 15° and 105° to the '110' primary flat to avoid crystallographic cleavage directions because mechanical strength was desired. The depth of the grooves was 1.15 mm, which was 85% of the wafer thickness. The two cutting parameters, progressive cutting thickness, and feed rate were optimized to reduce saw damage and chipping. Saw damage, which extended over a region of about 30 μm from grooves was removed by isotropic etching. The quality of the single crystal was tested by measuring the width of x‐ray rocking curves with a double‐crystal diffractometer. The best width obtained with 11.2 arc‐s. Since the ideal full width at half maximum (FWHM) according to x‐ray dynamical diffraction theory is 9.7 arc‐s, a broadening function with a FWHM of only 5.6 arc‐s is present due to residual strains (quadrature addition is assumed).
For more information, please visit our website: https://www.powerwaywafer.com,
send us email at email@example.com and firstname.lastname@example.org