Author/Authors :
Huber، نويسنده , , A. V. McCormick، نويسنده , , K. L. Andrew Chan، نويسنده , , P. and de Baar، نويسنده , , M.R. and Beaumont، نويسنده , , P. and Dalley، نويسنده , , S. F. Fink IV، نويسنده , , J. G. Fuchs، نويسنده , , J.C. and Fullard، نويسنده , , K. and Fundamenski، نويسنده , , W. and Ingesson، نويسنده , , L.C. and Kirnev، نويسنده , , G. and Lomas، نويسنده , , P. and Mast، نويسنده , , F. and Jachmich، نويسنده , , S. and Matthews، نويسنده , , G.F and Mertens، نويسنده , , Ph. and Meigs، نويسنده , , A. and Philipps، نويسنده , , V. and Rapp، نويسنده , , J. and Saibene، نويسنده , , G. and Sanders، نويسنده , , S. and Sartori، نويسنده , , R. and Stamp، نويسنده , , M.F. and Zeidner، نويسنده , , W.، نويسنده ,
Abstract :
To improve the quality of radiation measurements, two new bolometric cameras with horizontal and vertical views of the plasma cross-section have been installed on JET. These cameras provide measurements with significantly improved spatial resolution, allowing the divertor and main chamber radiation fractions to be clearly resolved. Analysis of radiation profiles under attached and detached divertor conditions as well during the formation of an X-point MARFE (XPM) close to an ohmic density limit are presented. The radiation power fraction γ = Prad/Pheat increases from 0.5 to 0.8 just before XPM onset. A large fraction of this radiation is located in the divertor ( P rad div / P rad tot = 0.56 at low density and about 0.67 at XPM onset). In addition, spatial distributions of radiation in recent ITER-like configuration discharges are presented.
