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

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

doi:10.1088/0029-5515/54/9/093008

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

Journal Article · Fri Aug 15 00:00:00 EDT 2014 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/54/9/093008· OSTI ID:1351087

Orlov, Dmitry M. ^[1]; Moyer, Richard A. ^[1]; Evans, Todd E. ^[2]; Wingen, Andreas ^[3]; Buttery, Richard J. ^[2]; Ferraro, Nathaniel M. ^[2]; Grierson, Brian A. ^[4]; Eldon, David ^[1]; Watkins, Jonathan G. ^[5]; Nazikian, Raffi ^[4]

Univ. of California San Diego, La Jolla, CA (United States)
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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-C¹, and the results are compared to the vacuum model showing that the plasma response model underestimates the boundary displacements.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1351087

Journal Information:: Nuclear Fusion, Vol. 54, Issue 9; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Imaging divertor strike point splitting in RMP ELM suppression experiments in the DIII-D tokamak Moyer, R. A.; Bykov, I.; Orlov, D. M. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038350	journal	October 2018
Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D Wade, M. R.; Nazikian, R.; deGrassie, J. S. Nuclear Fusion, Vol. 55, Issue 2 https://doi.org/10.1088/0029-5515/55/2/023002	journal	January 2015
Assessment of equilibrium field coil misalignments on the divertor footprints in NSTX-U Munaretto, S.; Evans, T. E.; Ferraro, N. M. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab1ee0	journal	June 2019

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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

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