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Title: 3D equilibrium reconstruction with islands

Abstract

This study presents the development of a 3D equilibrium reconstruction tool and the results of the first-ever reconstruction of an island equilibrium. The SIESTA non-nested equilibrium solver has been coupled to the V3FIT 3D equilibrium reconstruction code. Computed from a coupled VMEC and SIESTA model, synthetic signals are matched to measured signals by finding an optimal set of equilibrium parameters. By using the normalized pressure in place of normalized flux, non-equilibrium quantities needed by diagnostic signals can be efficiently mapped to the equilibrium. The effectiveness of this tool is demonstrated by reconstructing an island equilibrium of a DIII-D inner wall limited L-mode case with an n = 1 error field applied. Finally, flat spots in Thomson and ECE temperature diagnostics show the reconstructed islands have the correct size and phase.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1424449
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231; FG02-04ER54761; FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 4; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; islands; equilibrium; reconstruction

Citation Formats

Cianciosa, M., Hirshman, S. P., Seal, S. K., and Shafer, M. W. 3D equilibrium reconstruction with islands. United States: N. p., 2018. Web. doi:10.1088/1361-6587/aaaf90.
Cianciosa, M., Hirshman, S. P., Seal, S. K., & Shafer, M. W. 3D equilibrium reconstruction with islands. United States. doi:10.1088/1361-6587/aaaf90.
Cianciosa, M., Hirshman, S. P., Seal, S. K., and Shafer, M. W. Thu . "3D equilibrium reconstruction with islands". United States. doi:10.1088/1361-6587/aaaf90. https://www.osti.gov/servlets/purl/1424449.
@article{osti_1424449,
title = {3D equilibrium reconstruction with islands},
author = {Cianciosa, M. and Hirshman, S. P. and Seal, S. K. and Shafer, M. W.},
abstractNote = {This study presents the development of a 3D equilibrium reconstruction tool and the results of the first-ever reconstruction of an island equilibrium. The SIESTA non-nested equilibrium solver has been coupled to the V3FIT 3D equilibrium reconstruction code. Computed from a coupled VMEC and SIESTA model, synthetic signals are matched to measured signals by finding an optimal set of equilibrium parameters. By using the normalized pressure in place of normalized flux, non-equilibrium quantities needed by diagnostic signals can be efficiently mapped to the equilibrium. The effectiveness of this tool is demonstrated by reconstructing an island equilibrium of a DIII-D inner wall limited L-mode case with an n = 1 error field applied. Finally, flat spots in Thomson and ECE temperature diagnostics show the reconstructed islands have the correct size and phase.},
doi = {10.1088/1361-6587/aaaf90},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 60,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1. FIG. 1.: Te, ne and SXR emission pro files are mapped to VMEC flux surfaces. These quantities are evaluated by con- verting the laboratory space position in to a flux surface space position (a). The radial flux surface position is used to eval- uate the profi le function $f$ (s)more » (b).« less

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