Evidence for the role of magnetic entropy and turbulent equipartition in stationary Ohmic tokamak discharges

H. Weisen, E. Minardi

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Abstract

The electron temperature, pressure and density profiles from an extreme variety of shaped Ohmically heated sawtoothing plasmas in TCV (Tokamak à Configuration Variable, BT < 1.5 T, R0 = 0.88m, a < 0.25m) are compared to model predictions drawing from two bodies of theory. One of these is based on the assumption of stationary magnetic entropy and predicts stiff toroidal current, and consequently Ohmically relaxed electron temperature profiles. The second theory is based on the assumption of approximate conservation of the first and second adiabatic invariants during particle transport and predicts density profiles closely related to the safety factor. The robustness of these predictions in Ohmically heated plasmas is confirmed by systematic observations in TCV.
Original languageEnglish
Pages (from-to)542 - 548
Number of pages7
JournalEurophysics Letters
Volume56
Issue number4
DOIs
Publication statusPublished - 11 Nov 2001
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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