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Title: Optimizing multi-modal, non-axisymmetric plasma response metrics with additional coil rows on DIII-D

Abstract

The expansion of the DIII-D tokamak operational space via the addition of new non-axisymmetric coil rows is investigated using the linear MHD plasma response code MARS-F. The plasma response to magnetic perturbations imposed by five distinct low- and high-field side coil geometries is modeled for toroidal mode numbers up to n = 6. A set of linear (~δB^2: resonant, kink mode amplitude) and quadratic (~δB: core and edge integrated NTV torque) plasma metrics are defined and compared directly for the various coil geometries. Coil size is also scanned as a secondary optimization variable. An in-vessel coil located at the low-field side midplane is identified as the most efficient plasma response actuator across all metrics and toroidal mode numbers. The multi-row combination of this new midplane (M) coil with the existing DIII-D non-axisymmetric coil set is considered in numerical optimization studies to quantify the impact of this new coil on modeled plasma response metrics. The addition of the M coil is shown to significantly increase the actuator efficiency in maximizing individual plasma response metrics as well as maximizing multi-modal ratios of response metrics, e.g. maximizing resonant modes or edge NTV torque while minimizing kink modes or core NTV torque. The ex-vesselmore » midplane (C) coil is also observed to have an outsize effect on multi-modal optimization due to its uniquely narrow poloidal spectra, and the expansion of optimization space due to the combined use of the two existing in-vessel coil rows with both the M and C coils is notably larger than either coil's individual contribution even though both share similar poloidal locations. This four-row system is expected to greatly extend abilities to understand and optimize the control of transients and rotation on the DIII-D tokamak.« less

Authors:
ORCiD logo [1]; ORCiD logo; ; ORCiD logo
  1. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1562526
Alternate Identifier(s):
OSTI ID: 1562294
Report Number(s):
DOE-GA-54698
Journal ID: ISSN 0029-5515
Grant/Contract Number:  
FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 8; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Weisberg, D. B., Paz-Soldan, C., Liu, Y. Q., and Logan, N. C. Optimizing multi-modal, non-axisymmetric plasma response metrics with additional coil rows on DIII-D. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab265e.
Weisberg, D. B., Paz-Soldan, C., Liu, Y. Q., & Logan, N. C. Optimizing multi-modal, non-axisymmetric plasma response metrics with additional coil rows on DIII-D. United States. doi:10.1088/1741-4326/ab265e.
Weisberg, D. B., Paz-Soldan, C., Liu, Y. Q., and Logan, N. C. Tue . "Optimizing multi-modal, non-axisymmetric plasma response metrics with additional coil rows on DIII-D". United States. doi:10.1088/1741-4326/ab265e.
@article{osti_1562526,
title = {Optimizing multi-modal, non-axisymmetric plasma response metrics with additional coil rows on DIII-D},
author = {Weisberg, D. B. and Paz-Soldan, C. and Liu, Y. Q. and Logan, N. C.},
abstractNote = {The expansion of the DIII-D tokamak operational space via the addition of new non-axisymmetric coil rows is investigated using the linear MHD plasma response code MARS-F. The plasma response to magnetic perturbations imposed by five distinct low- and high-field side coil geometries is modeled for toroidal mode numbers up to n = 6. A set of linear (~δB^2: resonant, kink mode amplitude) and quadratic (~δB: core and edge integrated NTV torque) plasma metrics are defined and compared directly for the various coil geometries. Coil size is also scanned as a secondary optimization variable. An in-vessel coil located at the low-field side midplane is identified as the most efficient plasma response actuator across all metrics and toroidal mode numbers. The multi-row combination of this new midplane (M) coil with the existing DIII-D non-axisymmetric coil set is considered in numerical optimization studies to quantify the impact of this new coil on modeled plasma response metrics. The addition of the M coil is shown to significantly increase the actuator efficiency in maximizing individual plasma response metrics as well as maximizing multi-modal ratios of response metrics, e.g. maximizing resonant modes or edge NTV torque while minimizing kink modes or core NTV torque. The ex-vessel midplane (C) coil is also observed to have an outsize effect on multi-modal optimization due to its uniquely narrow poloidal spectra, and the expansion of optimization space due to the combined use of the two existing in-vessel coil rows with both the M and C coils is notably larger than either coil's individual contribution even though both share similar poloidal locations. This four-row system is expected to greatly extend abilities to understand and optimize the control of transients and rotation on the DIII-D tokamak.},
doi = {10.1088/1741-4326/ab265e},
journal = {Nuclear Fusion},
number = 8,
volume = 59,
place = {United States},
year = {2019},
month = {7}
}

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Experimental studies of high-confinement mode plasma response to non-axisymmetric magnetic perturbations in ASDEX Upgrade
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Error Field Amplification and Rotation Damping in Tokamak Plasmas
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Advances towards QH-mode viability for ELM-stable operation in ITER
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    Works referencing / citing this record:

    Validation of the linear ideal magnetohydrodynamic model of three-dimensional tokamak equilibria
    journal, March 2010

    • Lanctot, M. J.; Reimerdes, H.; Garofalo, A. M.
    • Physics of Plasmas, Vol. 17, Issue 3
    • DOI: 10.1063/1.3335237

    Full toroidal plasma response to externally applied nonaxisymmetric magnetic fields
    journal, December 2010

    • Liu, Yueqiang; Kirk, A.; Nardon, E.
    • Physics of Plasmas, Vol. 17, Issue 12
    • DOI: 10.1063/1.3526677

    Peak neoclassical toroidal viscosity at low toroidal rotation in the DIII-D tokamak
    journal, May 2011

    • Cole, A. J.; Callen, J. D.; Solomon, W. M.
    • Physics of Plasmas, Vol. 18, Issue 5
    • DOI: 10.1063/1.3590933

    Toroidal modeling of penetration of the resonant magnetic perturbation field
    journal, April 2013

    • Liu, Yueqiang; Kirk, A.; Sun, Y.
    • Physics of Plasmas, Vol. 20, Issue 4
    • DOI: 10.1063/1.4799535

    Magnetic control of magnetohydrodynamic instabilities in tokamaks
    journal, November 2014


    Self-consistent perturbed equilibrium with neoclassical toroidal torque in tokamaks
    journal, March 2017

    • Park, Jong-Kyu; Logan, Nikolas C.
    • Physics of Plasmas, Vol. 24, Issue 3
    • DOI: 10.1063/1.4977898

    Validation of the model for ELM suppression with 3D magnetic fields using low torque ITER baseline scenario discharges in DIII-D
    journal, October 2017

    • Moyer, R. A.; Paz-Soldan, C.; Nazikian, R.
    • Physics of Plasmas, Vol. 24, Issue 10
    • DOI: 10.1063/1.5000276

    Chapter 4: Power and particle control
    journal, June 2007


    Study of in-vessel nonaxisymmetric ELM suppression coil concepts for ITER
    journal, January 2008


    Effect of resonant and non-resonant magnetic braking on error field tolerance in high beta plasmas
    journal, September 2009


    Observation of ELM suppression in hybrid discharges using n = 3 magnetic perturbations on DIII-D
    journal, January 2010


    Advances towards QH-mode viability for ELM-stable operation in ITER
    journal, July 2011


    Measurement of plasma boundary displacement by n = 2 magnetic perturbations using imaging beam emission spectroscopy
    journal, November 2012


    Understanding edge-localized mode mitigation by resonant magnetic perturbations on MAST
    journal, March 2013


    Impact of plasma response on plasma displacements in DIII-D during application of external 3D perturbations
    journal, May 2014


    Experimental studies of high-confinement mode plasma response to non-axisymmetric magnetic perturbations in ASDEX Upgrade
    journal, November 2016


    Effect of rotation zero-crossing on single-fluid plasma response to three-dimensional magnetic perturbations
    journal, February 2017

    • Lyons, B. C.; Ferraro, N. M.; Paz-Soldan, C.
    • Plasma Physics and Controlled Fusion, Vol. 59, Issue 4
    • DOI: 10.1088/1361-6587/aa5860

    Grassy-ELM regime with edge resonant magnetic perturbations in fully noninductive plasmas in the DIII-D tokamak
    journal, July 2018