AVS 51st International Symposium
    Vacuum Technology Tuesday Sessions
       Session VT-TuP

Paper VT-TuP9
Photon Stimulated Desorption of the Low Temperature Aluminum Chambers for the Superconducting Wiggler

Tuesday, November 16, 2004, 4:00 pm, Room Exhibit Hall B

Session: Poster Session
Presenter: G.Y. Hsiung, NSRRC, Taiwan
Authors: G.Y. Hsiung, NSRRC, Taiwan
J.Y. Yang, NSRRC, Taiwan
C.C. Chang, NSRRC, Taiwan
S.N. Hsu, NSRRC, Taiwan
J.R. Chen, NSRRC, NTHU, Taiwan
Correspondent: Click to Email
A Superconducting Wiggler, SW6, has been installed in the 1.5 GeV electron storage ring of Taiwan Light Source (TLS) to obtain higher brilliance hard X-ray synchrotron light. The beam duct for the SW6, made of A6061 aluminum alloy, is operated at a temperature of ~ 100 K. It was concerned the gas molecules desorbed from exposure to the scattered light will be reabsorbed and piled up on the surface oxide layers that is difficult to be removed. To evaluate the photon stimulated desorption (PSD) from the low temperature beam duct, a test chamber has been installed in the 19B1(PSD) beam line of TLS for synchrotron light exposure at a critical photon energy of 2.14 keV. The yield of PSD is measured by a throughput method. The chamber was cooled by liquid nitrogen from outside. The residual gas analyzers measure the gas species that reflects the PSD behavior. The result for the beam test at the beam line will be described and the commissioning for the SW6 in the storage ring will also be addressed.