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Title: Helical core reconstruction of a DIII-D hybrid scenario tokamak discharge

Abstract

Our paper presents the first fully 3-dimensional (3D) equilibrium reconstruction of a helical core in a tokamak device. Using a new parallel implementation of the Variational Moments Equilibrium Code (PARVMEC) coupled to V3FIT, 3D reconstructions can be performed at resolutions necessary to produce helical states in nominally axisymmetric tokamak equilibria. In a flux pumping experiment performed on DIII-D, an external n=1 field was applied while a 3/2 neoclassical tearing mode was suppressed using ECCD. The externally applied field was rotated past a set of fixed diagnostics at a 20 Hz frequency. Furthermore, the modulation, were found to be strongest in the core SXR and MSE channels, indicates a localized rotating 3D structure locked in phase with the applied field. Signals from multiple time slices are converted to a virtual rotation of modeled diagnostics adding 3D signal information. In starting from an axisymmetric equilibrium reconstruction solution, the reconstructed broader current profile flattens the q-profile, resulting in an m=1, n=1 perturbation of the magnetic axis that is $$\sim 50\times $$ larger than the applied n=1 deformation of the edge. Error propagation confirms that the displacement of the axis is much larger than the uncertainty in the axis position validating the helical equilibrium.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Consorzio RFX, Padova (Italy)
  3. General Atomics, San Diego, CA (United States)
  4. Columbia Univ., New York, NY (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1361308
Alternate Identifier(s):
OSTI ID: 1375929
Grant/Contract Number:  
AC05-00OR22725; FG02-04ER54761; FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 7; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; VMEC; V3FIT; equilibrium reconstruction

Citation Formats

Cianciosa, Mark, Wingen, Andreas, Hirshman, Steven P., Seal, S. K., Unterberg, Ezekial A., Wilcox, Robert S., Piovesan, Paolo, Lao, Lang, and Turco, Francesca. Helical core reconstruction of a DIII-D hybrid scenario tokamak discharge. United States: N. p., 2017. Web. doi:10.1088/1741-4326/aa6f82.
Cianciosa, Mark, Wingen, Andreas, Hirshman, Steven P., Seal, S. K., Unterberg, Ezekial A., Wilcox, Robert S., Piovesan, Paolo, Lao, Lang, & Turco, Francesca. Helical core reconstruction of a DIII-D hybrid scenario tokamak discharge. United States. doi:10.1088/1741-4326/aa6f82.
Cianciosa, Mark, Wingen, Andreas, Hirshman, Steven P., Seal, S. K., Unterberg, Ezekial A., Wilcox, Robert S., Piovesan, Paolo, Lao, Lang, and Turco, Francesca. Thu . "Helical core reconstruction of a DIII-D hybrid scenario tokamak discharge". United States. doi:10.1088/1741-4326/aa6f82. https://www.osti.gov/servlets/purl/1361308.
@article{osti_1361308,
title = {Helical core reconstruction of a DIII-D hybrid scenario tokamak discharge},
author = {Cianciosa, Mark and Wingen, Andreas and Hirshman, Steven P. and Seal, S. K. and Unterberg, Ezekial A. and Wilcox, Robert S. and Piovesan, Paolo and Lao, Lang and Turco, Francesca},
abstractNote = {Our paper presents the first fully 3-dimensional (3D) equilibrium reconstruction of a helical core in a tokamak device. Using a new parallel implementation of the Variational Moments Equilibrium Code (PARVMEC) coupled to V3FIT, 3D reconstructions can be performed at resolutions necessary to produce helical states in nominally axisymmetric tokamak equilibria. In a flux pumping experiment performed on DIII-D, an external n=1 field was applied while a 3/2 neoclassical tearing mode was suppressed using ECCD. The externally applied field was rotated past a set of fixed diagnostics at a 20 Hz frequency. Furthermore, the modulation, were found to be strongest in the core SXR and MSE channels, indicates a localized rotating 3D structure locked in phase with the applied field. Signals from multiple time slices are converted to a virtual rotation of modeled diagnostics adding 3D signal information. In starting from an axisymmetric equilibrium reconstruction solution, the reconstructed broader current profile flattens the q-profile, resulting in an m=1, n=1 perturbation of the magnetic axis that is $\sim 50\times $ larger than the applied n=1 deformation of the edge. Error propagation confirms that the displacement of the axis is much larger than the uncertainty in the axis position validating the helical equilibrium.},
doi = {10.1088/1741-4326/aa6f82},
journal = {Nuclear Fusion},
number = 7,
volume = 57,
place = {United States},
year = {2017},
month = {5}
}

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