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Arcing and its role in PFC erosion and dust production in DIII-D
Ist Teil von
Journal of nuclear materials, 2013-07, Vol.438, p.S805-S808
Ort / Verlag
United States: Elsevier B.V
Erscheinungsjahr
2013
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Two types of arc tracks are observed on the plasma-facing components (PFCs) in DIII-D. “Unmagnetized” random walk tracks are produced during glow discharges; they are rare and have no importance for PFC erosion but may degrade diagnostic mirrors. “Magnetized” scratch-like type II tracks are produced by unipolar arcs during plasma operations; they are formed by “retrograde BxJ” motion of the cathode spot and are roughly perpendicular to the local magnetic field. Type II arcs cause measurable erosion of graphite, but based on the evidence available they are relatively small contributors to the total erosion of carbon in DIII-D compared to other mechanisms such as physical and chemical sputtering and ablation from leading edges. Erosion by arcing of tungsten films deposited on graphite samples was observed in Divertor Material Evaluation System (DiMES) experiments. New DiMES experiments aimed at time-resolved arc measurements are proposed.
Sprache
Englisch
Identifikatoren
ISSN: 0022-3115
eISSN: 1873-4820
DOI: 10.1016/j.jnucmat.2013.01.173
Titel-ID: cdi_osti_scitechconnect_1170814
Format
–
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