Particle Transport Due to Magnetic Fluctuations

Electron current fluctuations are measured with an electrostatic energy analyzer at the edge of the MST reversed-field pinch plasma. The radial flux of fast electrons (E>Tea) due to parallel streaming along a fluctuating magnetic field is determined locally by measuring the correlated product JeBr. Particle transport is small just inside the last closed flux surface (Γe,mag<0.1Γe,total), but can account for all observed particle losses inside ra=0.85. Electron diffusion is found to increase with parallel velocity, as expected for diffusion in a region of field stochasticity.