|Title||Interpretation of recent power width measurements in JET MkIIGB ELMy h-modes|
|Publication Type||Journal Article|
|Year of Publication||2002|
|Authors||W. Fundamenski, S. Sipila, G.F Matthews, V. Riccardo, P. Andrew, T. Eich, L.C Ingesson, T. Kiviniemi, T. Kurki-Suonio, V. Philipps|
|Journal||Plasma Physics and Controlled Fusion|
|Type of Article||Article|
Results of a novel technique of measuring the deposited power profile based on thermocouples embedded in the divertor plates a-re presented and discussed. Power profiles were obtained for a series of 2.5 MA/2.4 T discharges involving a scan in the NBI heating power (4-18 MW, where PL-H similar to 5 MW) and a scan in D-2 fuelling rate ((0-3) X 10(22) s(-1)). In H-mode plasmas, a narrow feature was observed in the power profile, which scaled inversely with power entering the scrape-off-layer, lambda(q,nw) infinity p(SOL)(-0.4+/-0.1), while the base profile showed virtually no power dependence. At constant input power, the peak heat flux was strongly reduced by D2 puffing (from similar to20 to 4 MW m(-2)), with the narrow feature in the power profile effectively suppressed. Based on numerical analysis using a guiding-centre Monte-Carlo code ASCOT, coupled to a fluid-like plasma-neutral code package OSM2/EIRENE, the above results are interpreted as a consequence of inter-ELM ion orbit loss from the pedestal region.
|URL||<Go to ISI>://000177105000012|
|Alternate Title||Plasma Phys. Control. Fusion|
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