Speaker
Description
Synchrotron radiation induced high yields of gas-desorption and photoelectrons from the vacuum beam ducts of large accelerators results in huge impacts of shortening the beam lifetime and beam instabilities from the trapped ions or electron cloud. Inspection of surface cleanness and coated materials on top surface layers of beam ducts by directly measuring the photon stimulated desorption (PSD) and photoelectron yield (PEY) at a beamline of synchrotron light source provides a quick and sensitive analysis of surface qualities of cleanness. A PSD-beamline BL19B of 1.5 GeV Taiwan Light Source (TLS) features a prompt measurement of PSD-yield and PEY for various vacuum tubes, e.g. titanium, stainless steel, copper, aluminum alloys, and the NEG-coated chambers, will be described in this presentation.
