Magnetic Polarization Measurements of the Multi-modal Plasma Response to 3D fields in the EAST Tokamak
Abstract
A multi-modal plasma response to applied non-axisymmetric fields has been found in EAST tokamak plasmas. Here, multi-modal means the radial and poloidal structure of an individually driven toroidal harmonic is not fixed. The signature of such a multi-modal response is the magnetic polarization (ratio of radial and poloidal components) of the plasma response field measured on the low field side device mid-plane. A difference in the 3D coil phasing (the relative phase of two coil arrays) dependencies between the two responses is observed in response to n=2 fields in the same plasma for which the n=1 responses are well synchronized. Neither the maximum radial nor the maximum poloidal field response to n=2 fields agrees with the best applied phasing for mitigating edge localized modes, suggesting that the edge plasma response is not a dominant component of either polarization. GPEC modeling reproduces the discrepant phasing dependences of the experimental measurements, and confirms the edge resonances are maximized by the coil phasing that mitigates ELMs in the experiments. The model confirms the measured plasma response is not dominated by resonant current drive from the external field. Instead, non-resonant contributions play a large role in the diagnostic signal for both toroidal harmonics n=1more »
- Authors:
-
[2];
[2];
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Chinese Academy of Sciences, Anhui (China)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1436768
- Grant/Contract Number:
- AC02-09CH11466; 11475224
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 7; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Tokamak; Resonant Magnetic Perturbations; Edge Localized Modes; Reluctance; GPEC
Citation Formats
Logan, Nikolas, Cui, L., Wang, Hui -Hui, Sun, Youwen, Gu, Shuai, Li, Guoqiang, Nazikian, Raffi, and Paz-Soldan, Carlos. Magnetic Polarization Measurements of the Multi-modal Plasma Response to 3D fields in the EAST Tokamak. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aac129.
Logan, Nikolas, Cui, L., Wang, Hui -Hui, Sun, Youwen, Gu, Shuai, Li, Guoqiang, Nazikian, Raffi, & Paz-Soldan, Carlos. Magnetic Polarization Measurements of the Multi-modal Plasma Response to 3D fields in the EAST Tokamak. United States. https://doi.org/10.1088/1741-4326/aac129
Logan, Nikolas, Cui, L., Wang, Hui -Hui, Sun, Youwen, Gu, Shuai, Li, Guoqiang, Nazikian, Raffi, and Paz-Soldan, Carlos. Mon .
"Magnetic Polarization Measurements of the Multi-modal Plasma Response to 3D fields in the EAST Tokamak". United States. https://doi.org/10.1088/1741-4326/aac129. https://www.osti.gov/servlets/purl/1436768.
@article{osti_1436768,
title = {Magnetic Polarization Measurements of the Multi-modal Plasma Response to 3D fields in the EAST Tokamak},
author = {Logan, Nikolas and Cui, L. and Wang, Hui -Hui and Sun, Youwen and Gu, Shuai and Li, Guoqiang and Nazikian, Raffi and Paz-Soldan, Carlos},
abstractNote = {A multi-modal plasma response to applied non-axisymmetric fields has been found in EAST tokamak plasmas. Here, multi-modal means the radial and poloidal structure of an individually driven toroidal harmonic is not fixed. The signature of such a multi-modal response is the magnetic polarization (ratio of radial and poloidal components) of the plasma response field measured on the low field side device mid-plane. A difference in the 3D coil phasing (the relative phase of two coil arrays) dependencies between the two responses is observed in response to n=2 fields in the same plasma for which the n=1 responses are well synchronized. Neither the maximum radial nor the maximum poloidal field response to n=2 fields agrees with the best applied phasing for mitigating edge localized modes, suggesting that the edge plasma response is not a dominant component of either polarization. GPEC modeling reproduces the discrepant phasing dependences of the experimental measurements, and confirms the edge resonances are maximized by the coil phasing that mitigates ELMs in the experiments. The model confirms the measured plasma response is not dominated by resonant current drive from the external field. Instead, non-resonant contributions play a large role in the diagnostic signal for both toroidal harmonics n=1 and n=2. The analysis in this paper demonstrates the ability of 3D modeling to connect external magnetic sensor measurements to the internal plasma physics and accurately predict optimal applied 3D field configurations in multi-modal plasmas.},
doi = {10.1088/1741-4326/aac129},
journal = {Nuclear Fusion},
number = 7,
volume = 58,
place = {United States},
year = {2018},
month = {4}
}
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Works referenced in this record:
Computation of three-dimensional tokamak and spherical torus equilibria
journal, May 2007
- Park, Jong-kyu; Boozer, Allen H.; Glasser, Alan H.
- Physics of Plasmas, Vol. 14, Issue 5
Nonlinear Transition from Mitigation to Suppression of the Edge Localized Mode with Resonant Magnetic Perturbations in the EAST Tokamak
journal, September 2016
- Sun, Y.; Liang, Y.; Liu, Y. Q.
- Physical Review Letters, Vol. 117, Issue 11
Experimental tests of linear and nonlinear three-dimensional equilibrium models in DIII-D
journal, July 2015
- King, J. D.; Strait, E. J.; Lazerson, S. A.
- Physics of Plasmas, Vol. 22, Issue 7
Reconstruction of current profile parameters and plasma shapes in tokamaks
journal, November 1985
- Lao, L. L.; St. John, H.; Stambaugh, R. D.
- Nuclear Fusion, Vol. 25, Issue 11
Equilibrium analysis of current profiles in tokamaks
journal, June 1990
- Lao, L. L.; Ferron, J. R.; Groebner, R. J.
- Nuclear Fusion, Vol. 30, Issue 6
Development of the ITER magnetic diagnostic set and specification
journal, October 2012
- Vayakis, G.; Arshad, S.; Delhom, D.
- Review of Scientific Instruments, Vol. 83, Issue 10
Neoclassical flows and transport in nonaxisymmetric toroidal plasmas
journal, January 1983
- Shaing, K. C.
- Physics of Fluids, Vol. 26, Issue 11
Error Field Amplification and Rotation Damping in Tokamak Plasmas
journal, May 2001
- Boozer, Allen H.
- Physical Review Letters, Vol. 86, Issue 22
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
Resonant magnetic perturbations of edge-plasmas in toroidal confinement devices
journal, November 2015
- Evans, T. E.
- Plasma Physics and Controlled Fusion, Vol. 57, Issue 12
Sustained suppression of type-I edge-localized modes with dominantly n = 2 magnetic fields in DIII-D
journal, July 2013
- Lanctot, M. J.; Buttery, R. J.; de Grassie, J. S.
- Nuclear Fusion, Vol. 53, Issue 8
Numerical optimization of three-dimensional coils for NSTX-U
journal, September 2015
- Lazerson, S. A.; Park, J-K; Logan, N.
- Plasma Physics and Controlled Fusion, Vol. 57, Issue 10
Control of Nonaxisymmetric Magnetic Field Perturbations in Tokamaks
journal, April 2011
- Boozer, Allen H.
- Fusion Science and Technology, Vol. 59, Issue 3
The ITER 3D magnetic diagnostic response to applied n = 3 and n = 4 resonant magnetic perturbations
journal, July 2014
- Lazerson, S. A.
- Plasma Physics and Controlled Fusion, Vol. 56, Issue 9
Non-axisymmetric magnetic fields and toroidal plasma confinement
journal, January 2015
- Boozer, Allen H.
- Nuclear Fusion, Vol. 55, Issue 2
Calculations of two-fluid linear response to non-axisymmetric fields in tokamaks
journal, May 2012
- Ferraro, N. M.
- Physics of Plasmas, Vol. 19, Issue 5
Equilibrium Reconstruction in EAST Tokamak
journal, April 2009
- Jinping, Qian; Baonian, Wan; Lao, L. L.
- Plasma Science and Technology, Vol. 11, Issue 2
Spatial and temporal analysis of DIII-D 3D magnetic diagnostic data
journal, August 2016
- Strait, E. J.; King, J. D.; Hanson, J. M.
- Review of Scientific Instruments, Vol. 87, Issue 11
Decoupled recovery of energy and momentum with correction of n = 2 error fields
journal, July 2015
- Paz-Soldan, C.; Logan, N. C.; Lanctot, M. J.
- Nuclear Fusion, Vol. 55, Issue 8
Measurement of the Resistive-Wall-Mode Stability in a Rotating Plasma Using Active MHD Spectroscopy
journal, September 2004
- Reimerdes, H.; Chu, M. S.; Garofalo, A. M.
- Physical Review Letters, Vol. 93, Issue 13
Computation of resistive instabilities by matched asymptotic expansions
journal, November 2016
- Glasser, A. H.; Wang, Z. R.; Park, J. -K.
- Physics of Plasmas, Vol. 23, Issue 11
The spectral basis of optimal error field correction on DIII-D
journal, April 2014
- Paz-Soldan, C.; Buttery, R. J.; Garofalo, A. M.
- Nuclear Fusion, Vol. 54, Issue 7
Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes
journal, May 2002
- Snyder, P. B.; Wilson, H. R.; Ferron, J. R.
- Physics of Plasmas, Vol. 9, Issue 5
Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D
journal, January 2015
- Wade, M. R.; Nazikian, R.; deGrassie, J. S.
- Nuclear Fusion, Vol. 55, Issue 2
The importance of matched poloidal spectra to error field correction in DIII-D
journal, July 2014
- Paz-Soldan, C.; Lanctot, M. J.; Logan, N. C.
- Physics of Plasmas, Vol. 21, Issue 7
Magnetic control of magnetohydrodynamic instabilities in tokamaks
journal, November 2014
- Strait, E. J.
- Physics of Plasmas, Vol. 22, Issue 2
Neoclassical Toroidal Plasma Viscosity Torque in Collisionless Regimes in Tokamaks
journal, October 2010
- Sun, Y.; Liang, Y.; Shaing, K. C.
- Physical Review Letters, Vol. 105, Issue 14
The EPED pedestal model and edge localized mode-suppressed regimes: Studies of quiescent H-mode and development of a model for edge localized mode suppression via resonant magnetic perturbations
journal, May 2012
- Snyder, P. B.; Osborne, T. H.; Burrell, K. H.
- Physics of Plasmas, Vol. 19, Issue 5
Resistive wall modes and error field amplification
journal, May 2003
- Boozer, Allen H.
- Physics of Plasmas, Vol. 10, Issue 5
Identification of multi-modal plasma responses to applied magnetic perturbations using the plasma reluctance
journal, May 2016
- Logan, Nikolas C.; Paz-Soldan, Carlos; Park, Jong-Kyu
- Physics of Plasmas, Vol. 23, Issue 5
The direct criterion of Newcomb for the ideal MHD stability of an axisymmetric toroidal plasma
journal, July 2016
- Glasser, A. H.
- Physics of Plasmas, Vol. 23, Issue 7
Advances in global MHD mode stabilization research on NSTX
journal, January 2010
- Sabbagh, S. A.; Berkery, J. W.; Bell, R. E.
- Nuclear Fusion, Vol. 50, Issue 2
Reactor-relevant quiescent H-mode operation using torque from non-axisymmetric, non-resonant magnetic fields
journal, May 2012
- Burrell, K. H.; Garofalo, A. M.; Solomon, W. M.
- Physics of Plasmas, Vol. 19, Issue 5
Neoclassical toroidal viscosity in perturbed equilibria with general tokamak geometry
journal, December 2013
- Logan, Nikolas C.; Park, Jong-Kyu; Kim, Kimin
- Physics of Plasmas, Vol. 20, Issue 12
Observation of Plasma Rotation Driven by Static Nonaxisymmetric Magnetic Fields in a Tokamak
journal, November 2008
- Garofalo, A. M.; Burrell, K. H.; DeBoo, J. C.
- Physical Review Letters, Vol. 101, Issue 19
Measurement of tokamak error fields using plasma response and its applicability to ITER
journal, April 2014
- Strait, E. J.; Buttery, R. J.; Casper, T. A.
- Nuclear Fusion, Vol. 54, Issue 7
Neoclassical plasma viscosity and transport processes in non-axisymmetric tori
journal, November 2015
- Shaing, K. C.; Ida, K.; Sabbagh, S. A.
- Nuclear Fusion, Vol. 55, Issue 12
Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression
journal, March 2015
- Paz-Soldan, C.; Nazikian, R.; Haskey, S. R.
- Physical Review Letters, Vol. 114, Issue 10
Kinetic energy principle and neoclassical toroidal torque in tokamaks
journal, November 2011
- Park, Jong-Kyu
- Physics of Plasmas, Vol. 18, Issue 11
Control of Asymmetric Magnetic Perturbations in Tokamaks
journal, November 2007
- Park, Jong-kyu; Schaffer, Michael J.; Menard, Jonathan E.
- Physical Review Letters, Vol. 99, Issue 19
Pedestal Bifurcation and Resonant Field Penetration at the Threshold of Edge-Localized Mode Suppression in the DIII-D Tokamak
journal, March 2015
- Nazikian, R.; Paz-Soldan, C.; Callen, J. D.
- Physical Review Letters, Vol. 114, Issue 10
Error Field Amplification and Rotation Damping in Tokamak Plasmas
journal, May 2001
- Boozer, Allen H.
- Physical Review Letters, Vol. 86, Issue 22
Measurement of the Resistive-Wall-Mode Stability in a Rotating Plasma Using Active MHD Spectroscopy
journal, September 2004
- Reimerdes, H.; Chu, M. S.; Garofalo, A. M.
- Physical Review Letters, Vol. 93, Issue 13
Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression
journal, March 2015
- Paz-Soldan, C.; Nazikian, R.; Haskey, S. R.
- Physical Review Letters, Vol. 114, Issue 10
Observation of Plasma Rotation Driven by Static Nonaxisymmetric Magnetic Fields in a Tokamak
journal, November 2008
- Garofalo, A. M.; Burrell, K. H.; DeBoo, J. C.
- Physical Review Letters, Vol. 101, Issue 19
Control of Asymmetric Magnetic Perturbations in Tokamaks
journal, November 2007
- Park, Jong-kyu; Schaffer, Michael J.; Menard, Jonathan E.
- Physical Review Letters, Vol. 99, Issue 19
Pedestal Bifurcation and Resonant Field Penetration at the Threshold of Edge-Localized Mode Suppression in the DIII-D Tokamak
journal, March 2015
- Nazikian, R.; Paz-Soldan, C.; Callen, J. D.
- Physical Review Letters, Vol. 114, Issue 10
Neoclassical Toroidal Plasma Viscosity Torque in Collisionless Regimes in Tokamaks
journal, October 2010
- Sun, Y.; Liang, Y.; Shaing, K. C.
- Physical Review Letters, Vol. 105, Issue 14
Control of Nonaxisymmetric Magnetic Field Perturbations in Tokamaks
journal, April 2011
- Boozer, Allen H.
- Fusion Science and Technology, Vol. 59, Issue 3
Nonlinear Transition from Mitigation to Suppression of the Edge Localized Mode with Resonant Magnetic Perturbations in the EAST Tokamak
journal, September 2016
- Sun, Y.; Liang, Y.; Liu, Y. Q.
- Physical Review Letters, Vol. 117, Issue 11
Works referencing / citing this record:
Identification of multiple eigenmode growth rates in DIII-D and EAST tokamak plasmas
journal, January 2019
- Wang, Z. R.; Logan, N. C.; Munaretto, S.
- Nuclear Fusion, Vol. 59, Issue 2
A new criterion for controlling edge localized modes based on a multi-mode plasma response
journal, October 2019
- Gu, S.; Wan, B.; Sun, Y.
- Nuclear Fusion, Vol. 59, Issue 12