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3D equilibrium reconstruction with islands

Journal Article · · Plasma Physics and Controlled Fusion
 [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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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.
Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725; FC02-04ER54698; FG02-04ER54761
OSTI ID:
1424449
Alternate ID(s):
OSTI ID: 1822101
Journal Information:
Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 4 Vol. 60; ISSN 0741-3335
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Development of a non-parametric Gaussian process model in the three-dimensional equilibrium reconstruction code V3FIT journal January 2020
Experimental observations of an n = 1 helical core accompanied by a saturated m / n = 2/1 tearing mode with low mode frequencies in JT-60U journal October 2019

Figures / Tables (13)

FIG. 1.(p. 3)figure FIG. 1.
FIG. 2.(p. 3)figure FIG. 2.
FIG. 3.(p. 5)figure FIG. 3.
FIG. 4.(p. 5)figure FIG. 4.
FIG. 5.(p. 5)figure FIG. 5.
TABLE I(p. 6)table TABLE I
TABLE II(p. 6)table TABLE II
TABLE III(p. 7)table TABLE III
FIG. 6.(p. 8)figure FIG. 6.
FIG. 7.(p. 8)figure FIG. 7.
FIG. 8.(p. 8)figure FIG. 8.
FIG. 9.(p. 9)figure FIG. 9.
FIG. 10.(p. 10)figure FIG. 10.

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
equilibrium
islands
reconstruction