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

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 fields 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-fluid-MHD model (M3D-C1) and a nonlinear ideal-MHD model (VMEC). Furthermore, it is observed that the probability of a discharge being 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 a 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 effective ELM suppression, the RMP has to prevent the plasma from generating a large kink response, associated with ELM instability. Experimental observations are in agreement with the finding; 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 a 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 3D ideal MHD equilibria using the VMEC code. The procedure of constructing optimal 3D equilibria for diverted H-mode discharges using VMEC is presented. As a result, kink displacements in VMEC are found to scale with the edge current density, similar to M3D-C1, but the displacements are smaller. A direct correlation in the flux surface displacements to the bootstrap current is shown.

View Accepted Manuscript (DOE)

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

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

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

OSTI ID:: 1265646

Alternate ID(s):: OSTI ID: 1238958
OSTI ID: 1356345
OSTI ID: 22539528

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

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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