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Persistent URL http://purl.org/net/epubs/work/26986161
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Record Id 26986161
Title Outgassing rates from stainless steel and the effects of gauges
Abstract The outgassing of stainless steel has been measured taking account of the production in the measuring gauge. Production of carbon monoxide and carbon dioxide in the gauges is shown to contribute at least 80% of the measured partial pressures. By using an isolation pressure rise technique coupled to NEG pumping it is possible to measure the outgassing of methane at very low levels. The specific outgassing rate of methane from 304L stainless steel is found to be 5x10-22 mbar l s-1 cm-2. It is concluded that only hydrogen and water outgas from clean stainless steel, but the water behaves strangely and may be created continuously on the surfaces of the steel. The rate of production and break-up of methane by the action of the gauge is also measured.
Organisation ISIS , STFC
Keywords Water , Carbon monoxide , Quadrupole mass analyser , Methane , Hydrogen , NEG pump , Vacuum , Outgassing rate , Carbon dioxide , Stainless steel
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Licence Information: Creative Commons Attribution 3.0 Unported (CC BY 3.0)
Language English (EN)
Type Details URI(s) Local file(s) Year
Report RAL Technical Reports RAL-TR-2016-008. 2016. RAL-TR-2016-008.pdf 2016