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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]

Abstract

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 equilibriamore » 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.« less

Authors:
 [1];  [2];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [2];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1265646
Alternate Identifier(s):
OSTI ID: 1238958; OSTI ID: 1356345
Grant/Contract Number:  
AC05-00OR22725; FC02-04ER54698
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 10; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tokamaks; magnetodydrodynamic; VMEC; M3D-Cl

Citation Formats

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., and Sontag, Aaron C. 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]. United States: N. p., 2015. Web. doi:10.1088/0741-3335/57/10/104006.
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. 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]. United States. doi:10.1088/0741-3335/57/10/104006.
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., and Sontag, Aaron C. Thu . "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]". United States. doi:10.1088/0741-3335/57/10/104006. https://www.osti.gov/servlets/purl/1265646.
@article{osti_1265646,
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]},
author = {Wingen, Andreas and Ferraro, Nathaniel M. and Shafer, Morgan W. and Unterberg, Ezekial A. and Canik, John M. and Evans, Todd E. and Hillis, Donald Lee and Hirshman, Steven Paul and Seal, Sudip K. and Snyder, Philip B. and Sontag, Aaron C.},
abstractNote = {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.},
doi = {10.1088/0741-3335/57/10/104006},
journal = {Plasma Physics and Controlled Fusion},
issn = {0741-3335},
number = 10,
volume = 57,
place = {United States},
year = {2015},
month = {9}
}

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    Works referencing / citing this record:

    Comparative investigation of ELM control based on toroidal modelling of plasma response to RMP fields
    journal, May 2017

    • Liu, Yueqiang; Kirk, A.; Li, Li
    • Physics of Plasmas, Vol. 24, Issue 5
    • DOI: 10.1063/1.4978884