skip to main content

Title: Closure of the single fluid magnetohydrodynamic equations in presence of electron cyclotron current drive

In the presence of electron cyclotron current drive (ECCD), the Ohm's law of single fluid magnetohydrodynamics is modified as E + v × B = η(J – J{sub EC}). This paper presents a new closure relation for the EC driven current density appearing in this modified Ohm's law. The new relation faithfully represents the nonlocal character of the EC driven current and its main origin in the Fisch-Boozer effect. The closure relation is validated on both an analytical solution of an approximated Fokker-Planck equation as well as on full bounce-averaged, quasi-linear Fokker-Planck code simulations of ECCD inside rotating magnetic islands. The new model contains the model put forward by Giruzzi et al. [Nucl. Fusion 39, 107 (1999)] in one of its limits.
Authors:
;  [1]
  1. FOM Institute DIFFER, Dutch Institute for Fundamental Energy Research, P.O. Box 1207, 3430 BE Nieuwegein (Netherlands)
Publication Date:
OSTI Identifier:
22299687
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 10; Other Information: (c) 2014 EURATOM; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANALYTICAL SOLUTION; APPROXIMATIONS; CURRENT DENSITY; ECR CURRENT DRIVE; FOKKER-PLANCK EQUATION; MAGNETIC ISLANDS; MAGNETOHYDRODYNAMICS; OHM LAW; SIMULATION