The radial electric field as a measure for field penetration of resonant magnetic perturbations

Mordijck, Saskia; Moyer, Richard A.; Ferraro, Nathaniel M.; Wade, Mickey R.; Osborne, Thomas H.

doi:10.1088/0029-5515/54/8/082003

Title: The radial electric field as a measure for field penetration of resonant magnetic perturbations

Journal Article · Wed Jun 18 00:00:00 EDT 2014 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/54/8/082003· OSTI ID:1352934

Mordijck, Saskia ^[1]; Moyer, Richard A. ^[2]; Ferraro, Nathaniel M. ^[3]; Wade, Mickey R. ^[3]; Osborne, Thomas H. ^[3]

College of William and Mary, Williamsburg, VA (United States)
Univ. of California San Diego, La Jolla, CA (United States)
General Atomics, San Diego, CA (United States)

In this study, we introduce a new indirect method for identifying the radial extent of the stochastic layer due to applying resonant magnetic perturbations (RMPs) in H-mode plasmas by measuring the spin-up of the plasma near the separatrix. This spin-up is a predicted consequence of enhanced loss of electrons due to magnetic stochastization. We find that in DIII-D H-mode plasmas with n = 3 RMPs applied for edge localized mode (ELM) suppression, the stochastic layer is limited to the outer 5% region in normalized magnetic flux, Ψ_N. This is in contrast to vacuum modeling predictions where this layer can penetrate up to 20% in Ψ_N. Theoretical predictions of a stochastic red radial electric field, E_r component exceed the experimental measurements by about a factor 3 close to the separatrix, suggesting that the outer region of the plasma is weakly stochastic. Linear response calculations with M3D-C1, a resistive two-fluid model, show that in this outer 5% region, plasma response often reduces the resonant magnetic field components by 67% or more in comparison with vacuum calculations. These results for DIII-D are in reasonable agreement with results from the MAST tokamak, where the magnetic field perturbation from vacuum field calculations needed to be reduced by 75% for agreement with experimental measurements of the x-point lobe structures.

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Research Organization:: College of William and Mary, Williamsburg, VA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1352934

Journal Information:: Nuclear Fusion, Vol. 54, Issue 8; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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