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Session 7F - DIII-D: Edge and H-Mode.
ORAL session, Thursday morning, November 14
Vail Room, Adam's Mark

[7F.04] Divertor Plasma Parameters During Radiative Divertor Operation on DIII--D

S.L. Allen, M.E. Fenstermacher, D.N. Hill, C.J. Lasnier, W.H. Meyer, G.D. Porter, R.D. Wood (Lawrence Livermore National Lab), A.W. Leonard, M.A. Mahdavi, T.W. Petrie, W.P. West (General Atomics), R. Maingi, M.R. Wade (Oak Ridge National Laboratory), D.G. Whyte (INRS--Energie et Materiaux)

A large array of divertor diagnostics has been used to characterize the DIII--D divertor conditions during radiative divertor operation. We have used both D_2 and impurities to reduce the divertor heat flux. Several discharge conditions have been obtained, including attached and detached ELMing H-modes. The multi-chord Divertor Thomson Scattering (DTS) system has been used with divertor sweeping to obtain 2-D measurements of n_e and T_e in the divertor. The T_e drops to \leq 2 eV with D_2 puffing, n_e increases, and the electron pressure P_e decreases. The radiation zone, measured by multi-chord bolometry, moves from the inside leg of the divertor to the outside. Comparisons of the 2-D distribution of n_e and T_e and the radiation distribution will be presented.

Part 7 of program listing