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Abstract

Particle recycling resulting from turbulent convection is identified as a mechanism for ion heating in the RFP plasma. A steady state plasma, in which an outward flux is balanced by the appearance of new material within the discharge, is investigated through a perturbation analysis of moments of the Boltzmann equation modified by the addition of a source term. The work done in overcoming the drag exerted on the plasma turbulent motion by the new particles is shown to be the origin of non-ohmic ion heating that can compete in effectiveness with conventional viscous heating. It is rapid enough to account for the anomalously fast ion heating seen in RFP plasmas, and it can explain the observed correlation between ion temperature and loop volts. It accounts for the anomaly found in the resistivity derived from global magnetic energy balance. It is responsible for a new component of resistivity that could become dominant in low density discharges, and it is incompatible with a fully relaxed Taylor state, which could be approached only if recycling were to vanish.

Additional information

Authors: TSUI H Y W, UKAEA/Euratom Fusion Association, Culham Laboratory, Abingdon, Oxon. (GB);EVANS D E, UKAEA/Euratom Fusion Association, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: CLM-P866 EN (1990)
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX 14 3DB (GB)
Record Number: 199010628 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en
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