BENT-CRYSTAL MONOCHROMATORS FOR HIGH-ENERGY SYNCHROTRON-RADIATION

Two kinds of monochromators covering the energy ranges 100-150 keV and similar to 300 keV have been designed for inelastic (Compton) scatter ing experiments at the elliptical multipole wiggler beamline, BL08W, o f SPring-8. Finite-element analyses using ANSYS for bent crystals indi cate that thermal problems are not serious for the 300 keV monochromat or, while an energy spread of about 10(-3) for the 100-150 keV monochr omator is possible in the centre of the crystal. Detailed calculations of X-ray interaction with the silicon crystal were performed. The res ults show that Compton scattering is a dominant process and deposits a bout 100 W continuously.