THE ADVANCED PHOTON SOURCE-X-RAY TRANSMITTING BEAM-POSITION-MONITOR TESTS AT THE NATIONAL SYNCHROTRON LIGHT-SOURCE X-25 BEAMLINE

A synthetic-diamond-based X-ray transmitting beam-position monitor has been studied using focused white beam at the National Synchrotron Lig ht Source X-25 wiggler beamline. of particular interest are the possib ilities to design an integral window and filter/photon beam-position m onitor for the Advanced Photon Source high-heat-flux insertion-device beamlines. The preliminary measurements were taken using two synthetic -diamond blade samples with different thicknesses and cooling configur ations. The monitor (consisting of a vacuum vessel, an ion pump, a wat er-cooling base, a blade mounting block, and electric feedthroughs) wa s mounted on a three-dimensional (x, y, phi) stepping-motor-driven sta ge with a 0.064-mum stepping size and a 0.1-mum linear encoder resolut ion. An infrared camera system was used to monitor and record the diam ond blade surface temperature field through a sapphire window and test results are presented.