Author/Authors :
Kugel، نويسنده , , H.W. and Mansfield، نويسنده , , D. and Maingi، نويسنده , , R. and Bell، نويسنده , , M.G. and Bell، نويسنده , , R.E. and Allain، نويسنده , , J.P. and Gates، نويسنده , , D. and Gerhardt، نويسنده , , S. and Kaita، نويسنده , , R. and Kallman، نويسنده , , J. A. Kaye، نويسنده , , S. and LeBlanc، نويسنده , , B. and Majeski، نويسنده , , R. M. Menard، نويسنده , , J. and Mueller، نويسنده , , M. D. Ichiro Ono، نويسنده , , M. and Paul، نويسنده , , S. Sundar Raman، نويسنده , , R. and Roquemore، نويسنده , , A.L. and Ross، نويسنده , , P.W. and Sabbagh، نويسنده , , S. and Schneider، نويسنده , , and H. G. Skinner ، نويسنده , , C.H. and Soukhanovskii، نويسنده , , V. and Stevenson، نويسنده , , T. and Timberlake، نويسنده , , J. and Wampler، نويسنده , , W.R. and Wilgren، نويسنده , , J. and Zakharov، نويسنده , , L.، نويسنده ,
Abstract :
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 Prior to each discharge, the evaporators were withdrawn behind shutters, where they also remained during the subsequent HeGDC applied for periods up to 9.5 min.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.
