|Title||Evidence of inhomogeneous thermal transport in RTP|
|Publication Type||Journal Article|
|Year of Publication||1996|
|Authors||G.MD Hogeweij, C.C. Chu, D.F Da Cruz, F. De Luca, G. Gorini, A. Jacchia, N.JL Cardozo, P. Mantica, A.AM Oomens, M. Peters, F.J. Pijper, R.W Polman|
There are strong indications that the radial electron thermal diffusivity is not a smooth function of the radius, but shows strong local variations. To investigate this irregularity systematically, a number of dedicated experiments have been carried out in the RTP tokamak: intense central heating, pellet ablation experiments, perturbative transport studies and steady state off-axis heating. The crucial diagnostic in these experiments is the Thomson scattering system, with a radial resolution of 1% of the minor radius. In sawtoothing plasmas a transport barrier has been identified near the sawtooth inversion radius. With steady state off-axis heating, hollow current density profiles have been sustained, and the region of reversed magnetic shear is characterized by very low thermal transport.
Go back one page.