Title :
Differences in synchrotron radiation induced gas desorption from stainless steel and aluminium alloy
Author :
Andritschky, M. ; Gröbner, O. ; Mathewson, A.G. ; Strubin, P. ; Souchet, R. ; Trickett, B.
Author_Institution :
CERN, Geneva, Switzerland
Abstract :
A comparative study has been made of the synchrotron-radiation-induced gas desorption from vacuum chambers made of stainless steel and aluminum alloy. The sample vacuum chambers of about 3.6 m length have been exposed to synchrotron radiation on an external photon beam line at the DCI storage ring in Orsay, France. The desorbed gas species are H2, CH4, CO, and CO2 . The gradual decrease of the desorption yield with continued exposure to radiation-the dynamic cleaning effect-and the influence of a high-temperature thermal treatment of the stainless steel vacuum chamber on the desorption process have been investigated. The different behavior of the aluminium and the stainless steel-for the latter both a lower level of gas desorption and a lower cleaning rate are found-is interpreted in terms of the photoelectron production and the different surface oxide layers
Keywords :
aluminium alloys; desorption; stainless steel; synchrotron radiation; vacuum apparatus; 3.6 m; Al alloy; CO; CO2; DCI storage ring; H2; desorption yield; dynamic cleaning effect; external photon beam line; high-temperature thermal treatment; methane; photoelectron production; stainless steel; surface oxide layers; synchrotron radiation induced gas desorption; vacuum chambers; Aluminum alloys; Cleaning; Electrons; Electrostatic discharge; Orifices; Position measurement; Steel; Storage rings; Synchrotron radiation; System testing;
Conference_Titel :
Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE
Conference_Location :
Chicago, IL
DOI :
10.1109/PAC.1989.73119
