The local electron energy flux produced by magnetic fluctuations has been measured directly in the MST reversed field pinch (over the radial range r/a>0.75).The flux, produced by electrons traveling parallel to a fluctuating magentic field, is obtained from correlation between the fluctuations in the parallel heat flux and the radial magnetic field. The fluctuation induced flux is large (100 kW/${\mathrm{cm}}^2$) in the ‘‘core’’ (r/a<0.85) and small (<10–30 kW/${\mathrm{cm}}^2$) in the edge.

• Received 4 November 1993

DOI:https://doi.org/10.1103/PhysRevLett.72.1028