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

fYear

1989

fDate

20-23 Mar 1989

Firstpage

563

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/PAC.1989.73119

Filename

73119