SciTech Connect

Title: Evaporated Lithium Surface Coatings in NSTX

Evaporated Lithium Surface Coatings in NSTX Two lithium evaporators were used to evaporate more than 100 g of lithium on to the NSTX lower divertor region. Prior to each discharge, the evaporators were withdrawn behind shutters, where they also remained during the subsequent HeGDC applied for periods up to 9.5 min. After the HeGDC, the shutters were opened and the LITERs were reinserted to deposit lithium on the lower divertor target for 10 min, at rates of 10-70 mg/min, prior to the next discharge. The major improvements in plasma performance from these lithium depositions include: 1) plasma density reduction as a result of lithium deposition; 2) suppression of ELMs; 3) improvement of energy confinement in a low-triangularity shape; 4) improvement in plasma performance for standard, high-triangularity discharges; 5) reduction of the required HeGDC time between discharges; 6) increased pedestal electron and ion temperature; 7) reduced SOL plasma density; and 8) reduced edge neutral density.
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Publication Date:
OSTI Identifier:953205
Report Number(s):PPPL4399
TRN: US0902721
DOE Contract Number:DE-ACO2-09CH11466
Resource Type:Conference
Data Type:
Resource Relation:Journal Name: Journal of Nuclear Materials (May 2008); Conference: 18th International Conf on Plasma Surface Interactions, Toledo, Spain May 26-30, 2008
Research Org:Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ
Sponsoring Org:USDOE Office of Science (SC)
Country of Publication:United States
Language:English
Subject: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONFINEMENT; DEPOSITION; DIVERTORS; ELECTRONS; EVAPORATORS; ION TEMPERATURE; LITHIUM; PERFORMANCE; PLASMA; PLASMA DENSITY; SHAPE; SHUTTERS; SOLS; SURFACE COATING; TARGETS CO600 Coatings, PO500 Plasma-materials interactions, S1300 Surface effects; 10100 Impurities