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Persistent URL http://purl.org/net/epubs/work/62586
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Record Id 62586
Title Effect of coating morphology on the electron stimulated desorption from Ti-Zr-Hf-V nonevaporable-getter-coated stainless steel
Abstract The electron stimulated desorption (ESD) was studied for quaternary Ti-Zr-Hf-V alloy coated stainless steel samples with different surface structures: dense on one sample and columnar on another. The ESD yields were measured as a function of electron accumulated dose up to ~1023 e-/m2 or greater and three different NEG coating activation temperatures: 150, 180 and 250 oC. After each ESD experiment the samples were saturated with a mixture of H2, CO and CO2. Both samples depicted lower ESD yields for all desorbed species compared to a ternary Ti-Zr-V alloy. It was also shown that although the columnar NEG coating demonstrated better pumping properties and, for NEG activated at 150 oC, lower initial ESD yields, the higher activation temperature may result in a significant H2 yield increase with dose for the columnar NEG coating. This effect was demonstrated for the first time and should be considered for application in particle accelerators.
Organisation ASTeC , ASTeC-VS , STFC
Keywords Physics , activation , pumping , Electron stimulated desorption , non-evaporable getter , coating , ASTeC 2012-2013
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article Vacuum 86, no. 12 (2012): 2035-2039. doi:10.1016/j.vacuum.2012.04.033 2012