Air exposure and sample storage time influence on hydrogen release from tungsten
Air exposure and sample storage time influence on hydrogen release from tungsten
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DOI：
10.1016/j.jnucmat.2010.07.011
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发表时间：
2010-09
影响因子：
3.1
通讯作者：
K. Moshkunov;Klaus Schmid;M. Mayer;V. Kurnaev;Y. Gasparyan
中科院分区：
文献类型：
--
作者：
K. Moshkunov;Klaus Schmid;M. Mayer;V. Kurnaev;Y. Gasparyan
In investigations of hydrogen retention in first wall components the influence of the conditions of the implanted target storage prior to analysis and the storage time is often neglected. Therefore we have performed a dedicated set of experiments. The release of hydrogen from samples exposed to ambient air after irradiation was compared to samples kept in vacuum. For air exposed samples significant amounts of HDO and D2O are detected during TDS. Additional experiments have shown that heavy water is formed by recombination of releasing D and H atoms with O on the W surface. This water formation can alter hydrogen retention results significantly, in particular – for low retention cases. In addition to the influence of ambient air exposure also the influence of storage time in vacuum was investigated. After implantation at 300K the samples were stored in vacuum for up to 1week during which the retained amount decreased significantly. The subsequently measured TDS spectra showed that D was lost from both the high and low energy peaks during storage at ambient temperature of ∼300K. An attempt to simulate this release from both peaks during room temperature storage by TMAP 7 calculations showed that this effect cannot be explained by conventional diffusion/trapping models.
