FAST-ELECTRON BEHAVIOR IN COMPARISON WITH DYNAMO MODELS IN A REVERSED-FIELD PINCH

On the basis of soft-X ray diagnostics, it is shown that the role of t he edge fast electrons in the reversed-field pinch (RFP) dynamo mechan ism is insignificant in the early phase of a discharge in the STE-2 RF P. In the high-fill-pressure region, this is also the case even with t he current maximum phase. The pressure dependence of the edge magnetic fluctuations is possibly different from the expected dominance of the MHD dynamo activity in the high-pressure regime, indicating the impor tance of direct measurement of the phase relation between velocity and magnetic field fluctuations.