Pulse-by-pulse measurements of dynamic retention and deposition in NSTX

Three quartz crystal microbalances have been deployed in NSTX to measure deposition/erosion in plasma shadowed areas at the upper and lower divertor and outboard midplane. These show a complex pattern of material gain and loss. At the time of a plasma discharge a transient increase in mass of order...

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Bibliographic Details
Published in:Journal of nuclear materials 2007-06, Vol.363-365, p.247-251
Main Authors: Skinner, C.H., Kugel, H.W., Roquemore, A.L., Maingi, R., Wampler, W.R.
Format: Article
Language:English
Subjects:
Amorphous films
Applied sciences
Controled nuclear fusion plants
Desorption
Energy
Energy. Thermal use of fuels
Erosion and deposition
Exact sciences and technology
Installations for energy generation and conversion: thermal and electrical energy
NSTX
Retention
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Summary:Three quartz crystal microbalances have been deployed in NSTX to measure deposition/erosion in plasma shadowed areas at the upper and lower divertor and outboard midplane. These show a complex pattern of material gain and loss. At the time of a plasma discharge a transient increase in mass of order ∼0.1μgcm−2 is observed that decays in the interpulse period to a level either higher, lower or similar to that prior to the discharge. The first discharge of the day always shows a long term step-up in mass. Some correlations of mass gain with plasma duration, stored energy, and change in the plasma shape are observed. Following a days plasma operations, a slow decay in mass is observed. The results are interpreted in terms of dynamic retention and erosion/deposition.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2007.01.076