Connection between plasma response and resonant magnetic perturbation (RMP) edge localized mode (ELM) suppression in DIII-D [Connection between plasma response and RMP ELM suppression in DIII-D]

Wingen, Andreas; Ferraro, Nathaniel M.; Shafer, Morgan W.; Unterberg, Ezekial A.; Canik, John M.; Evans, Todd E.; Hillis, Donald Lee; Hirshman, Steven Paul; Seal, Sudip K.; Snyder, Philip B.; Sontag, Aaron C.

doi:10.1088/0741-3335/57/10/104006

Title: Connection between plasma response and resonant magnetic perturbation (RMP) edge localized mode (ELM) suppression in DIII-D [Connection between plasma response and RMP ELM suppression in DIII-D]

Journal Article · Thu Sep 03 00:00:00 EDT 2015 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/57/10/104006· OSTI ID:1265646

Wingen, Andreas ^[1]; Ferraro, Nathaniel M. ^[2]; Shafer, Morgan W. ^[1]; Unterberg, Ezekial A. ^[1]; Canik, John M. ^[1]; Evans, Todd E. ^[2]; Hillis, Donald Lee ^[1]; Hirshman, Steven Paul ^[1]; Seal, Sudip K. ^[1]; Snyder, Philip B. ^[2]; Sontag, Aaron C. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)

Calculations of the plasma response to applied non-axisymmetric elds in several DIII-D discharges show that predicted displacements depend strongly on the edge current density. This result is found using both a linear two- uid-MHD model (M3D-C1) and a nonlinear ideal-MHD model (VMEC). Furthermore, it is observed that the probability of a discharge to be edge localized mode (ELM)-suppressed is most closely related to the edge current density, as opposed to the pressure gradient. It is found that discharges with stronger kink-response are closer to the peeling-ballooning stability limit in ELITE simulations and eventually cross into the unstable region, causing ELMs to reappear. Thus for e ective ELM suppression, the RMP has to hold back the plasma from generating a large kink response, associated with ELM instability. Experimental observations are in agreement with the nding; discharges which have a strong kink response in the MHD simulations show ELMs or ELM mitigation during the RMP phase of the experiment while discharges with small kink response in the MHD simulations are fully ELM suppressed in the experiment by the applied resonant magnetic perturbation. The results are cross-checked against modeled 3-D ideal MHD equilibria, using the VMEC code. The procedure to construct optimal 3-D equilibria for diverted H-mode discharges using VMEC is presented. It is found that the kink displacements in VMEC scale with the edge current density, similar to M3D-C1, but the displacements are smaller. A direct correlation of the ux surface displacements to the bootstrap current is shown.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698

OSTI ID:: 1265646

Alternate ID(s):: OSTI ID: 1238958; OSTI ID: 1356345

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 57, Issue 10; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations Willensdorfer, M.; Cote, T. B.; Griener, M. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aadc39	journal	November 2018
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Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak Suttrop, W.; Kirk, A.; Bobkov, V. Nuclear Fusion, Vol. 58, Issue 9 https://doi.org/10.1088/1741-4326/aace93	journal	July 2018
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Title: Connection between plasma response and resonant magnetic perturbation (RMP) edge localized mode (ELM) suppression in DIII-D [Connection between plasma response and RMP ELM suppression in DIII-D]

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