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Abstract

Flux surface averaged transport in high confinement (H) discharges with burst free phases is analyzed by computer modelling. The electron heat diffusivity chi-e and diffusion coefficient D in undisturbed H phases are found to be about twice as small as those in ordinary H discharges with high-frequency bursts. Scaling relations for chi-e, D and v-in are successfully applied. The confinement properties of ohmically heated plasmas are not recovered in the H regime. Ion heat conduction continues to be neoclassical. The steep rise of the impurity radiation loss is explained by the increase in electron density and accumulation of the iron impurity. The dominant loss channels are electron heat conduction and impurity radiation. Conductive and convective energy losses due to the ions are negligibly small.

Additional information

Authors: BECKER G MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (GERMANY)
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP III/99, 1984
Record Number: 1989123024200 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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