Measurements of a prototype synchrotron radiation pumped absorber for future light sources

Abstract

In the new generation of advanced synchrotron light sources, the conventional concept of distributed pumping is no longer suitable for removing the gas load caused by photon stimulated dssorption (PSD). A new concept using a combination of photon absorber and pumping station has been designed, constructed, and installed in the U10B beam line at the VUV ring of the National Synchrotron Light Source. The system consists of an electrically insulated water cooled copper block, a titanium sublimation pump, calibrated BA gauges, a calibrated RGA, and a known conductance. A photon beam 10 milliradian wide and 3.26 milliradian high, hsving critical energy of 500 eV, is directed on the absorber. PSD yield is studied as a function of total beam dose and absorber ;'• surface preparation. The results frost-this experiment, pumpcharacteristics, design of an absorber''pump for future light • sources, and the pressure improvement factors will be presented.