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Abstract

Toroidicity and the 3-D structure of the limiters do not appear to have a strong effect on poloidally and toroidally averaged neutral profiles in the bulk plasma, at least for the typical ohmic JET discharges examined. The simple 1-D models reproduce sufficiently well the radial neutral profiles. This justifies the use of such models in transport codes where only averaged values of neutral profiles are required for source and sink terms. In such codes other inaccuracies are more relevant than those related to uncertainties in neutral profiles of the order estimated above. However, strong poloidal and toroidal asymmetries in neutral profiles are indeed present. They could play a role that remains to be assessed for problems where only the local neutral density or an average over particular lines of sight is to be considered, e.g. the determination of the ion temperatures from NPA measurements.

Additional information

Authors: SIMONINI R, JET JOINT UNDERTAKING, ABINGDON (UK);TARONI A JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: 13TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA HEATING, SCHLIERSEE (GERMANY), APRIL 14-18, 1986 PP. 21-24 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK) MENTIONING REPORT JET-P(86)15, 1986
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