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Title: Comparison of the numerical modelling and experimental measurements of DIII-D separatrix displacements during H-modes with resonant magnetic perturbations

Numerical modeling of the plasma boundary position and its displacement due to external magnetic perturbations in DIII-D low-collisionality H-mode discharges is presented. The results of the vacuum model are compared to the experimental measurements for boundary displacements including Thomson scattering electron temperature T e, charge exchange recombination spectroscopy, beam emission spectroscopy, soft x-ray, and divertor Langmuir probe measurements. Magnetically perturbed discharges with toroidal mode number n=2 and n=3 are studied. It is shown that the vacuum model predictions agree well with the measurements above and below the midplane, and disagree at the outer midplane in discharges where significant kink amplification is present. Lastly, the role of the plasma response is studied using the two-fluid MHD code M3D-C 1, and the results are compared to the vacuum model showing that the plasma response model underestimates the boundary displacements.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [4] ;  [1] ;  [5] ;  [4]
  1. Univ. of California San Diego, La Jolla, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 54; Journal Issue: 9; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; stochastic magnetic field lines; non-axisymmetric magnetic perturbations; tokamaks; ELM (edge localized modes); ELM control; RMP (resonant magnetic perturbation)
OSTI Identifier:
1351087

Orlov, Dmitry M., Moyer, Richard A., Evans, Todd E., Wingen, Andreas, Buttery, Richard J., Ferraro, Nathaniel M., Grierson, Brian A., Eldon, David, Watkins, Jonathan G., and Nazikian, Raffi. Comparison of the numerical modelling and experimental measurements of DIII-D separatrix displacements during H-modes with resonant magnetic perturbations. United States: N. p., Web. doi:10.1088/0029-5515/54/9/093008.
Orlov, Dmitry M., Moyer, Richard A., Evans, Todd E., Wingen, Andreas, Buttery, Richard J., Ferraro, Nathaniel M., Grierson, Brian A., Eldon, David, Watkins, Jonathan G., & Nazikian, Raffi. Comparison of the numerical modelling and experimental measurements of DIII-D separatrix displacements during H-modes with resonant magnetic perturbations. United States. doi:10.1088/0029-5515/54/9/093008.
Orlov, Dmitry M., Moyer, Richard A., Evans, Todd E., Wingen, Andreas, Buttery, Richard J., Ferraro, Nathaniel M., Grierson, Brian A., Eldon, David, Watkins, Jonathan G., and Nazikian, Raffi. 2014. "Comparison of the numerical modelling and experimental measurements of DIII-D separatrix displacements during H-modes with resonant magnetic perturbations". United States. doi:10.1088/0029-5515/54/9/093008. https://www.osti.gov/servlets/purl/1351087.
@article{osti_1351087,
title = {Comparison of the numerical modelling and experimental measurements of DIII-D separatrix displacements during H-modes with resonant magnetic perturbations},
author = {Orlov, Dmitry M. and Moyer, Richard A. and Evans, Todd E. and Wingen, Andreas and Buttery, Richard J. and Ferraro, Nathaniel M. and Grierson, Brian A. and Eldon, David and Watkins, Jonathan G. and Nazikian, Raffi},
abstractNote = {Numerical modeling of the plasma boundary position and its displacement due to external magnetic perturbations in DIII-D low-collisionality H-mode discharges is presented. The results of the vacuum model are compared to the experimental measurements for boundary displacements including Thomson scattering electron temperature Te, charge exchange recombination spectroscopy, beam emission spectroscopy, soft x-ray, and divertor Langmuir probe measurements. Magnetically perturbed discharges with toroidal mode number n=2 and n=3 are studied. It is shown that the vacuum model predictions agree well with the measurements above and below the midplane, and disagree at the outer midplane in discharges where significant kink amplification is present. Lastly, the role of the plasma response is studied using the two-fluid MHD code M3D-C1, and the results are compared to the vacuum model showing that the plasma response model underestimates the boundary displacements.},
doi = {10.1088/0029-5515/54/9/093008},
journal = {Nuclear Fusion},
number = 9,
volume = 54,
place = {United States},
year = {2014},
month = {8}
}