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Title: V3FIT: a code for three-dimensional equilibrium reconstruction

Abstract

The V3FIT code for performing equilibrium reconstruction in three-dimensional plasmas is described. It is a modular code that has the potential to be coupled with a variety of equilibrium solvers to compute the externally measured response to an arbitrary internal state of the plasma. Singular value decomposition is used to identify the dominant components of the plasma state that can be accurately determined by the reconstruction process and to guide the minimization of the ! " 2 variance-normalized mismatch between the measured and computed signals. Comparison of a tokamak plasma equilibrium computed by V3FIT and by the axisymmetric equilibrium reconstruction code EFIT is presented. V3FIT is used to reconstruct an axisymmetric DIII-D equilibrium using experimentally observed magnetic diagnostic signals. Three-dimensional reconstructions of stellarator plasma equilibria in the CTH device show the code behaves as expected in the presence of experimental noise, appropriately ignores near-singular directions in parameter space, and robustly reconstructs equilibria starting from substantially different initial parameter values.

Authors:
 [1];  [2];  [1];  [3];  [2];  [1]
  1. Auburn University, Auburn, Alabama
  2. ORNL
  3. General Atomics, San Diego
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1032023
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 49; Journal Issue: 7; Journal ID: ISSN 0029--5515
Country of Publication:
United States
Language:
English
Subject:
CIRCULAR CROSS-SECTION; DIII-D TOKAMAK; PLASMA CONFIGURATIONS; STOCHASTICITY; STELLARATORS; PARAMETERS; PROFILE; DESIGN; PINCH; LI

Citation Formats

Hanson, James D, Hirshman, Steven Paul, Knowlton, Stephen F, Lao, Lang L, Lazarus, Edward Alan, and Shields, John M. V3FIT: a code for three-dimensional equilibrium reconstruction. United States: N. p., 2009. Web. doi:10.1088/0029-5515/49/7/075031.
Hanson, James D, Hirshman, Steven Paul, Knowlton, Stephen F, Lao, Lang L, Lazarus, Edward Alan, & Shields, John M. V3FIT: a code for three-dimensional equilibrium reconstruction. United States. doi:10.1088/0029-5515/49/7/075031.
Hanson, James D, Hirshman, Steven Paul, Knowlton, Stephen F, Lao, Lang L, Lazarus, Edward Alan, and Shields, John M. Thu . "V3FIT: a code for three-dimensional equilibrium reconstruction". United States. doi:10.1088/0029-5515/49/7/075031.
@article{osti_1032023,
title = {V3FIT: a code for three-dimensional equilibrium reconstruction},
author = {Hanson, James D and Hirshman, Steven Paul and Knowlton, Stephen F and Lao, Lang L and Lazarus, Edward Alan and Shields, John M},
abstractNote = {The V3FIT code for performing equilibrium reconstruction in three-dimensional plasmas is described. It is a modular code that has the potential to be coupled with a variety of equilibrium solvers to compute the externally measured response to an arbitrary internal state of the plasma. Singular value decomposition is used to identify the dominant components of the plasma state that can be accurately determined by the reconstruction process and to guide the minimization of the ! " 2 variance-normalized mismatch between the measured and computed signals. Comparison of a tokamak plasma equilibrium computed by V3FIT and by the axisymmetric equilibrium reconstruction code EFIT is presented. V3FIT is used to reconstruct an axisymmetric DIII-D equilibrium using experimentally observed magnetic diagnostic signals. Three-dimensional reconstructions of stellarator plasma equilibria in the CTH device show the code behaves as expected in the presence of experimental noise, appropriately ignores near-singular directions in parameter space, and robustly reconstructs equilibria starting from substantially different initial parameter values.},
doi = {10.1088/0029-5515/49/7/075031},
journal = {Nuclear Fusion},
issn = {0029--5515},
number = 7,
volume = 49,
place = {United States},
year = {2009},
month = {1}
}