Equilibrium reconstruction for Single Helical Axis reversed field pinch plasmas
Abstract
Single Helical Axis (SHAx) configurations are emerging as the natural state for high current reversed field pinch (RFP) plasmas. These states feature the presence of transport barriers in the core plasma. Here we present a method for computing the equilibrium magnetic surfaces for these states in the force-free approximation, which has been implemented in the SHEq code. The method is based on the superposition of a zeroth order axisymmetric equilibrium and of a first order helical perturbation computed according to Newcomb's equation supplemented with edge magnetic field measurements. The mapping of the measured electron temperature profiles, soft X-ray emission and interferometric density measurements on the computed magnetic surfaces demonstrates the quality of the equilibrium reconstruction. The procedure for computing flux surface averages is illustrated, and applied to the evaluation of the thermal conductivity profile. The consistency of the evaluated equilibria with Ohm's law is also discussed.
Keywords
Cite
@article{arxiv.1101.2153,
title = {Equilibrium reconstruction for Single Helical Axis reversed field pinch plasmas},
author = {Emilio Martines and Rita Lorenzini and Barbara Momo and David Terranova and Paolo Zanca and Alberto Alfier and Federica Bonomo and Alessandra Canton and Alessandro Fassina and Paolo Franz and Paolo Innocente},
journal= {arXiv preprint arXiv:1101.2153},
year = {2015}
}
Comments
Submitted to Plasma Physics and Controlled Fusion