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Title: Equilibrium Reconstruction on the Large Helical Device

Abstract

Equilibrium reconstruction is commonly applied to axisymmetric toroidal devices. Recent advances in computational power and equilibrium codes have allowed for reconstructions of three-dimensional fields in stellarators and heliotrons. We present the first reconstructions of finite beta discharges in the Large Helical Device (LHD). The plasma boundary and magnetic axis are constrained by the pressure profile from Thomson scattering. This results in a calculation of plasma beta without a-priori assumptions of the equipartition of energy between species. Saddle loop arrays place additional constraints on the equilibrium. These reconstruction utilize STELLOPT, which calls VMEC. The VMEC equilibrium code assumes good nested flux surfaces. Reconstructed magnetic fields are fed into the PIES code which relaxes this constraint allowing for the examination of the effect of islands and stochastic regions on the magnetic measurements.

Authors:
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1039422
Report Number(s):
PPPL-4649
TRN: US1202151
DOE Contract Number:  
DE-ACO2-09CHO11466
Resource Type:
Conference
Resource Relation:
Conference: 38th EPS Plasma Physics Conference, Strasbourg, Fr. (June 2011)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MAGNETIC FIELDS; MAGNETIC SURFACES; PHYSICS; PLASMA; STELLARATORS; THOMSON SCATTERING; Equilibrium

Citation Formats

Samuel A. Lazerson, D. Gates, D. Monticello, H. Neilson, N. Pomphrey, A. Reiman S. Sakakibara, and Y. Suzuki. Equilibrium Reconstruction on the Large Helical Device. United States: N. p., 2012. Web.
Samuel A. Lazerson, D. Gates, D. Monticello, H. Neilson, N. Pomphrey, A. Reiman S. Sakakibara, and Y. Suzuki. Equilibrium Reconstruction on the Large Helical Device. United States.
Samuel A. Lazerson, D. Gates, D. Monticello, H. Neilson, N. Pomphrey, A. Reiman S. Sakakibara, and Y. Suzuki. 2012. "Equilibrium Reconstruction on the Large Helical Device". United States. https://www.osti.gov/servlets/purl/1039422.
@article{osti_1039422,
title = {Equilibrium Reconstruction on the Large Helical Device},
author = {Samuel A. Lazerson, D. Gates, D. Monticello, H. Neilson, N. Pomphrey, A. Reiman S. Sakakibara, and Y. Suzuki},
abstractNote = {Equilibrium reconstruction is commonly applied to axisymmetric toroidal devices. Recent advances in computational power and equilibrium codes have allowed for reconstructions of three-dimensional fields in stellarators and heliotrons. We present the first reconstructions of finite beta discharges in the Large Helical Device (LHD). The plasma boundary and magnetic axis are constrained by the pressure profile from Thomson scattering. This results in a calculation of plasma beta without a-priori assumptions of the equipartition of energy between species. Saddle loop arrays place additional constraints on the equilibrium. These reconstruction utilize STELLOPT, which calls VMEC. The VMEC equilibrium code assumes good nested flux surfaces. Reconstructed magnetic fields are fed into the PIES code which relaxes this constraint allowing for the examination of the effect of islands and stochastic regions on the magnetic measurements.},
doi = {},
url = {https://www.osti.gov/biblio/1039422}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jul 27 00:00:00 EDT 2012},
month = {Fri Jul 27 00:00:00 EDT 2012}
}

Conference:
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