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Enhanced confinement discharges in DIII-D with neon and argon induced radiation

1999; Elsevier BV; Volume: 266-269; Linguagem: Inglês

10.1016/s0022-3115(98)00653-9

1873-4820

G.L. Jackson, M. Murakami, G. M. Staebler, M. R. Wade, A. Messiaen, J. Ongena, B. Unterberg, J.A. Boedo, T.E. Evans, A.W. Hyatt, R.J. LaHaye, C.J. Lasnier, A.W. Leonard, G. W. McKee, R. Maingi, R. A. Moyer, T.W. Petrie, W.P. West,

Laser-Plasma Interactions and Diagnostics

Enhanced energy confinement in discharges with impurity induced radiating power fractions, Prad/Pin, from 50% to 100% have been observed in the DIII-D tokamak with neon and argon gas puffing. These radiating mantle enhanced confinement discharges have been obtained in the DIII-D tokamak under a variety of conditions: diverted and limited configurations with both an H-mode and L-mode edge. Confinement enhancements as high as the ELM free H-mode scaling relation have been obtained with impurity gas puffing, although operation at the highest densities is transient. Similarities and differences between these DIII-D discharges and RI-mode discharges obtained in the TEXTOR tokamak are discussed.