Studies of internal magnetic fluctuation in the HL-1M tokamak

The transport of runaway electrons in a hot plasma can be comparatively easily measured in steady state or perturbation experiments, which provide runaway electron diffusivityＤｒ.The diffusivity can be interpreted in terms of the magnetic luctuation level. The runaway electron diffusion coefficient is determined by nternal magnetic fluctuations. The internal magnetic fluctuations level (bｒ/BT) is estimated to be about (2～4) ×10-4 in the HL-1M plasma. The results demonstrate the effectiveness of using runaway transport techniques for determining internal magnetic fluctuations. A profile of the magnetic fluctuation level in the HL-1M tokamak can be estimated from Dr.