Plasma and Fusion Research

Volume 3, S1070 (2008)

Regular Articles

Quantifying Profile Stiffness
Boudewijn Ph. VAN MILLIGEN, Raúl SÁNCHEZ1), Victor TRIBALDOS and Victor I. VARGAS
Asociación EURATOM-CIEMAT para Fusión, Avda. Complutense 22, 28040 Madrid, Spain
1)
Fusion Energy Division, Oak Ridge National Laboratory, P.O. Box 2001, Oak Ridge, TN 37831-2001, USA
(Received 13 November 2007 / Accepted 29 January 2008 / Published 1 August 2008)

Abstract

Profile stiffness is quantified using a simple technique. The approach is tested on a paradigmatic numerical stiff transport model for one field (particles). The stiffness is found to exhibit radial structure and to depend on collisionality, which might help explaining the observed lack of stiffness in stellarators, as compared to tokamaks. The extension of this approach to heat transport requires some care. A proposal for a stiffness quantifier for heat transport is presented, and tested on data from the TJ-II stellarator.

Keywords

profile stiffness, anomalous transport, critical gradient, tokamak-stellarator comparison

DOI: 10.1585/pfr.3.S1070

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This paper may be cited as follows:

Boudewijn Ph. VAN MILLIGEN, Raúl SÁNCHEZ, Victor TRIBALDOS and Victor I. VARGAS, Plasma Fusion Res. 3, S1070 (2008).