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Title: Diagnostic suite used for magnetohydrodynamics equilibrium reconstruction on the PEGASUS toroidal experiment (abstract)

Abstract

Magnetic equilibrium reconstruction on the PEGASUS toroidal experiment is a crucial tool to determine macroscopic plasma parameters, such as geometry, l{sub i}, {beta}{sub t}, and q{sub {psi}}. These parameters are tightly coupled to the plasma shape due to the very high toroidicity in PEGASUS where A{approx}1.1--1.3. A systematic scan of model plasma parameters in a magnetic equilibrium code has been employed to determine an acceptable array of magnetic diagnostics for accurately characterizing the plasma equilibrium. The magnetic diagnostics used include a poloidal array of magnetic pickup coils and flux loops along with a Rogowski loop for the toroidal plasma current. A 270 GHz {mu} wave interferometer for line averaged density in conjunction with spectroscopic temperature estimates provide a central pressure constraint. Visible images of the plasma provide constraints on the plasma size and location. A one-dimensional SXR camera is being developed to provide a measurement of the magnetic axis location. A time evolving current filament model and wall flux loops are used to determine the induced currents flowing in the continuous, resistive vacuum vessel wall. The ability of the equilibrium reconstruction code to reproduce model equilibria using this diagnostic set provides a quantitative measure of the accuracy of these equilibriummore » reconstructions. A Monte Carlo analysis with Gaussian noise added to the model data tests the robustness of this technique. A comparison of the model equilibria with the reconstructions obtained using noisy data is shown.« less

Authors:
; ; ; ; ;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40204800
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 72; Journal Issue: 1; Other Information: Othernumber: RSINAK000072000001000430000001; 691101CON; PBD: Jan 2001; Journal ID: ISSN 0034-6748
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACCURACY; CAMERAS; GEOMETRY; INTERFEROMETERS; MAGNETOHYDRODYNAMICS; PHYSICS; PLASMA; SHAPE

Citation Formats

Sontag, A C, Garstka, G D, Fonck, R J, Schooff, R J, Thorson, T A, and Tritz, K L. Diagnostic suite used for magnetohydrodynamics equilibrium reconstruction on the PEGASUS toroidal experiment (abstract). United States: N. p., 2001. Web. doi:10.1063/1.1323472.
Sontag, A C, Garstka, G D, Fonck, R J, Schooff, R J, Thorson, T A, & Tritz, K L. Diagnostic suite used for magnetohydrodynamics equilibrium reconstruction on the PEGASUS toroidal experiment (abstract). United States. https://doi.org/10.1063/1.1323472
Sontag, A C, Garstka, G D, Fonck, R J, Schooff, R J, Thorson, T A, and Tritz, K L. 2001. "Diagnostic suite used for magnetohydrodynamics equilibrium reconstruction on the PEGASUS toroidal experiment (abstract)". United States. https://doi.org/10.1063/1.1323472.
@article{osti_40204800,
title = {Diagnostic suite used for magnetohydrodynamics equilibrium reconstruction on the PEGASUS toroidal experiment (abstract)},
author = {Sontag, A C and Garstka, G D and Fonck, R J and Schooff, R J and Thorson, T A and Tritz, K L},
abstractNote = {Magnetic equilibrium reconstruction on the PEGASUS toroidal experiment is a crucial tool to determine macroscopic plasma parameters, such as geometry, l{sub i}, {beta}{sub t}, and q{sub {psi}}. These parameters are tightly coupled to the plasma shape due to the very high toroidicity in PEGASUS where A{approx}1.1--1.3. A systematic scan of model plasma parameters in a magnetic equilibrium code has been employed to determine an acceptable array of magnetic diagnostics for accurately characterizing the plasma equilibrium. The magnetic diagnostics used include a poloidal array of magnetic pickup coils and flux loops along with a Rogowski loop for the toroidal plasma current. A 270 GHz {mu} wave interferometer for line averaged density in conjunction with spectroscopic temperature estimates provide a central pressure constraint. Visible images of the plasma provide constraints on the plasma size and location. A one-dimensional SXR camera is being developed to provide a measurement of the magnetic axis location. A time evolving current filament model and wall flux loops are used to determine the induced currents flowing in the continuous, resistive vacuum vessel wall. The ability of the equilibrium reconstruction code to reproduce model equilibria using this diagnostic set provides a quantitative measure of the accuracy of these equilibrium reconstructions. A Monte Carlo analysis with Gaussian noise added to the model data tests the robustness of this technique. A comparison of the model equilibria with the reconstructions obtained using noisy data is shown.},
doi = {10.1063/1.1323472},
url = {https://www.osti.gov/biblio/40204800}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 1,
volume = 72,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2001},
month = {Mon Jan 01 00:00:00 EST 2001}
}