Fabricating rectangular internal cooling channels in silicon x-ray monochromator optics

Internally cooled monochromator crystals have been successfully fabricated and tested with synchrotron radiation. A single block of silicon was parted in the middle and grooves on a mm scale were cut into one half. The two blocks were then bonded back together with a silver-glass die attach paste. After firing in air at 430 degree C, the composite crystal was virtually strain free. One version of the composite crystal with cooling channels 0.76 mm beneath the diffracting surface was successfully tested at CHESS with intense undulator radiation