Effect of coating morphology on the electron stimulated desorption from Ti-Zr-Hf-V nonevaporable-getter-coated stainless steel
Effect of coating morphology on the electron stimulated desorption from Ti-Zr-Hf-V nonevaporable-getter-coated stainless steel
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DOI：
10.1016/j.vacuum.2012.04.033
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发表时间：
2012-07-20
期刊：
影响因子：
4
通讯作者：
Hannah, A.
中科院分区：
文献类型：
--
作者：
Malyshev, O. B.;Valizadeh, R.;Hannah, A.
研究了具有不同表面结构的四元 Ti-Zr-Hf-V 合金涂层不锈钢样品的电子刺激解吸 (ESD)：一个样品是致密的，另一个样品是柱状的。 ESD 产率被测量为电子累积剂量的函数，高达 10(23) e(-)/m(2) 或更高，并且三个不同的 NEG 涂层激活温度：150、180 和 250 摄氏度。每次 ESD 实验后，样品都用 H-2 混合物饱和。一氧化碳和二氧化碳。与三元 Ti-Zr-V 合金相比，两个样品的所有解吸物质的 ESD 产量均较低。研究还表明，尽管柱状 NEG 涂层表现出更好的泵送性能，并且对于在 150 摄氏度下激活的 NEG，初始 ESD 产率较低，但较高的激活温度可能会导致柱状 NEG 涂层的 H-2 产率随着剂量的增加而显着增加。这种效应是首次得到证实，应该考虑在粒子加速器中应用。 Crown 版权所有 (C) 2012 由 Elsevier Ltd 出版。保留所有权利。
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 similar to 10(23) e(-)/m(2) or greater and three different NEG coating activation temperatures: 150, 180 and 250 degrees C. After each ESD experiment the samples were saturated with a mixture of H-2. 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 degrees C, lower initial ESD yields, the higher activation temperature may result in a significant H-2 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. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.