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Title: Numerical studies and metric development for validation of magnetohydrodynamic models on the HIT-SI experiment

Abstract

We present application of three scalar metrics derived from the Biorthogonal Decomposition (BD) technique to evaluate the level of agreement between macroscopic plasma dynamics in different data sets. BD decomposes large data sets, as produced by distributed diagnostic arrays, into principal mode structures without assumptions on spatial or temporal structure. These metrics have been applied to validation of the Hall-MHD model using experimental data from the Helicity Injected Torus with Steady Inductive helicity injection experiment. Each metric provides a measure of correlation between mode structures extracted from experimental data and simulations for an array of 192 surface-mounted magnetic probes. Numerical validation studies have been performed using the NIMROD code, where the injectors are modeled as boundary conditions on the flux conserver, and the PSI-TET code, where the entire plasma volume is treated. Initial results from a comprehensive validation study of high performance operation with different injector frequencies are presented, illustrating application of the BD method. Using a simplified (constant, uniform density and temperature) Hall-MHD model, simulation results agree with experimental observation for two of the three defined metrics when the injectors are driven with a frequency of 14.5 kHz.

Authors:
 [1];  [2]; ; ; ;  [3]; ;  [3];  [2];  [1]
  1. PSI-Center, University of Washington, Seattle, Washington 98195 (United States)
  2. (United States)
  3. HIT-SI Group, University of Washington, Seattle, Washington 98195 (United States)
Publication Date:
OSTI Identifier:
22410385
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOUNDARY CONDITIONS; COMPUTERIZED SIMULATION; EXPERIMENTAL DATA; HALL EFFECT; HELICITY; KHZ RANGE; MAGNETIC PROBES; MAGNETOHYDRODYNAMICS; NUMERICAL ANALYSIS; PLASMA; SCALARS; VALIDATION

Citation Formats

Hansen, C., E-mail: hansec@uw.edu, Columbia University, New York, New York 10027, Victor, B., Morgan, K., Hossack, A., Sutherland, D., Jarboe, T., Nelson, B. A., PSI-Center, University of Washington, Seattle, Washington 98195, and Marklin, G. Numerical studies and metric development for validation of magnetohydrodynamic models on the HIT-SI experiment. United States: N. p., 2015. Web. doi:10.1063/1.4919277.
Hansen, C., E-mail: hansec@uw.edu, Columbia University, New York, New York 10027, Victor, B., Morgan, K., Hossack, A., Sutherland, D., Jarboe, T., Nelson, B. A., PSI-Center, University of Washington, Seattle, Washington 98195, & Marklin, G. Numerical studies and metric development for validation of magnetohydrodynamic models on the HIT-SI experiment. United States. doi:10.1063/1.4919277.
Hansen, C., E-mail: hansec@uw.edu, Columbia University, New York, New York 10027, Victor, B., Morgan, K., Hossack, A., Sutherland, D., Jarboe, T., Nelson, B. A., PSI-Center, University of Washington, Seattle, Washington 98195, and Marklin, G. Fri . "Numerical studies and metric development for validation of magnetohydrodynamic models on the HIT-SI experiment". United States. doi:10.1063/1.4919277.
@article{osti_22410385,
title = {Numerical studies and metric development for validation of magnetohydrodynamic models on the HIT-SI experiment},
author = {Hansen, C., E-mail: hansec@uw.edu and Columbia University, New York, New York 10027 and Victor, B. and Morgan, K. and Hossack, A. and Sutherland, D. and Jarboe, T. and Nelson, B. A. and PSI-Center, University of Washington, Seattle, Washington 98195 and Marklin, G.},
abstractNote = {We present application of three scalar metrics derived from the Biorthogonal Decomposition (BD) technique to evaluate the level of agreement between macroscopic plasma dynamics in different data sets. BD decomposes large data sets, as produced by distributed diagnostic arrays, into principal mode structures without assumptions on spatial or temporal structure. These metrics have been applied to validation of the Hall-MHD model using experimental data from the Helicity Injected Torus with Steady Inductive helicity injection experiment. Each metric provides a measure of correlation between mode structures extracted from experimental data and simulations for an array of 192 surface-mounted magnetic probes. Numerical validation studies have been performed using the NIMROD code, where the injectors are modeled as boundary conditions on the flux conserver, and the PSI-TET code, where the entire plasma volume is treated. Initial results from a comprehensive validation study of high performance operation with different injector frequencies are presented, illustrating application of the BD method. Using a simplified (constant, uniform density and temperature) Hall-MHD model, simulation results agree with experimental observation for two of the three defined metrics when the injectors are driven with a frequency of 14.5 kHz.},
doi = {10.1063/1.4919277},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 22,
place = {United States},
year = {2015},
month = {5}
}