ENERGY TRANSPORT IN ASDEX IN RELATION TO THEORETICAL AND SEMI-EMPIRICAL TRANSPORT COEFFICIENTS
A comparison of measurements with theoretically predicted energy transport coefficients is made for Ohmic and NBI-heated discharges, using both analysis and simulation codes. The contribution of strong electrostatic turbulence given by the n(i)- driven modes to the ion heat conductivity is very successful in explaining the observed response of confinement to density profile changes and is even found to be in good quantitative agreement. Regarding the electron branch, a combination of trapped electron driven turbulence and resistive ballooning modes may be a promising model to explain both the correct power and density dependence of confinement time, and the observed radial dependence of the electron heat conductivity.
Bibliographic Reference: REPORT: IPP5/29 EN (1989) 31 PP. AVAILABLE FROM MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (DE)
Record Number: 1989128069400 / Last updated on: 1990-11-09
Available languages: en