Surface morphology and deuterium retention of tungsten after low- and high-flux deuterium plasma exposure
- 't Hoen, M.H.J.
- Balden, M.
- Manhard, A.
- Mayer, M.
- Elgeti, S.
- Kleyn, A.W.
- Zeijlmans van Emmichoven, P.A.
DOIAbstract
The surface morphology and deuterium retention were investigated of polycrystalline tungsten targets that were exposed to deuterium plasmas at widely varying conditions. By changing only one parameter at a time, the isolated effects of flux, time and pre-damaging on surface modifications and deuterium retention were studied. The sample exposed to low-flux plasma (10(20) m(-2)s(-1)) is mostly smooth with only a few areas containing very large blisters (50-500 m). The samples exposed to high-flux plasmas (10(24) m(-2)s(-1)) show large numbers of smaller blisters (1-10 m) and in addition even smaller protrusions (<750 nm). The size of the blisters and their density strongly increase with fluence. Pre-damaging tungsten with MeV ions leads to le...
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