PHOTODESORPTION AND POWER TESTING OF THE SR CROTCH-ABSORBER FOR BESSY-II

Some elements of BESSY-II vacuum system [1] as Crotch-Absorbers were produced at Budker Institute of Nuclear Physics (BINP). One of that OFHC copper crotch-absorber was tested both for photodesorption yield and with power. The special SR beamline and installation were designed, build and installed with aim to measure gas photodesorption from the crotch-absorber. The crotch-absorber have been exposed to 2.66 keV critical energy synchrotron radiation from the wiggler on VEPP-3 storage ring at BINP. The photodesorption yield dependence as a function of accumulated photons is presented. This measurements allow to predict the dynamic pressure in BESSY-2. An electron beam welding machine was used for power testing of the crotch-absorber. It was shown tha