Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-08-01

Journal: PLASMA PHYSICS AND CONTROLLED FUSION

Included Journals: Scopus、EI、SCIE

Volume: 59

Issue: 8

ISSN: 0741-3335

Key Words: SOL/divertor plasma; heat flux; Langmuir probe; LHD

Abstract: The measured divertor heat flux profiles are compared to the EMC3-EIRENE simulations for two different times of an LHD discharge, corresponding to higher and lower edge temperatures. The relation between the three-dimensional magnetic field structure and the heat flux distributions on the divertor has been analysed. The modelled heat flux for the lower plasma temperature case has a better agreement with the experimental result obtained by the Langmuir probes, which shows a qualitative reproduction of the experimental profile shape. However, the heat flux distribution for the high plasma temperature case shows a different behaviour between the simulation results and the experimental measurements. The detailed analysis of the heat flux distribution for the higher temperature case which has a larger discrepancy has been performed, both quantitatively and qualitatively. The radiation of the eroded impurity from divertor target plates has a minor effect on the heat flux distribution. Non-uniform cross-field transport coefficients are used in the simulations and its impact on the heat flux distributions is discussed for the case of the high plasma temperature.