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}
}