Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak
Abstract
For this, access conditions for full suppression of Edge Localised Modes (ELMs) by Magnetic Perturbations (MP) in low density high confinement mode (H-mode) plasmas are studied in the ASDEX Upgrade tokamak. The main empirical requirements for full ELM suppression in our experiments are: 1. The poloidal spectrum of the MP must be aligned for best plasma response from weakly stable kink-modes, which amplify the perturbation, 2. The plasma edge density must be below a critical value, 3.3 × 1019 m-3. The edge collisionality is in the range v$$*\atop{i}$$ = 0.15 - 0.42 (ions) and v$$*\atop{e}$$ = 0.15 - 0.25 (electrons). However, our data does not show that the edge collisionality is the critical parameter that governs access to ELM suppression. 3. The pedestal pressure must be kept sufficiently low to avoid destabilisation of small ELMs. This requirement implies a systematic reduction of pedestal pressure of typically 30% compared to unmitigated ELMy H-mode in otherwise similar plasmas. 4. The edge safety factor q95 lies within a certain window. Within the range probed so far, q95 = 3.5 - 4.2, one such window, q95 = 3.57-3.95 has been identified. Within the range of plasma rotation encountered so far, no apparent threshold of plasma rotation for ELM suppression is found. This includes cases with large cross field electron flow in the entire pedestal region.
- Authors:
-
- Max Planck Inst. for Plasma Physics (IPP), Garching (Germany)
- Culham Centre for Fusion Energy (CCFE), Abingdon (United Kingdom)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- General Atomics, San Diego, CA (United States)
- Max Planck Inst. for Plasma Physics (IPP), Garching (Germany); Univ. of Seville (Spain). Dept. of Atomic, Molecular and Nuclear Physics
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE; European Commission (EC)
- Contributing Org.:
- The ASDEX Upgrade; MST1 Teams; EUROfusion Consortium
- OSTI Identifier:
- 1468580
- Grant/Contract Number:
- 633053
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 9; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 22 GENERAL STUDIES OF NUCLEAR REACTORS; ASDEX Upgrade; Edge Localised Modes; ELMs; ELM suppression; RMP; Resonant Magnetic Perturbation
Citation Formats
Suttrop, W., Kirk, A., Bobkov, V., Cavedon, M., Dunne, M., McDermott, R. M., Meyer, H., Nazikian, R., Paz-Soldan, C., Ryan, D. A., Viezzer, E., and Willensdorfer, M. Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aace93.
Suttrop, W., Kirk, A., Bobkov, V., Cavedon, M., Dunne, M., McDermott, R. M., Meyer, H., Nazikian, R., Paz-Soldan, C., Ryan, D. A., Viezzer, E., & Willensdorfer, M. Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak. United States. https://doi.org/10.1088/1741-4326/aace93
Suttrop, W., Kirk, A., Bobkov, V., Cavedon, M., Dunne, M., McDermott, R. M., Meyer, H., Nazikian, R., Paz-Soldan, C., Ryan, D. A., Viezzer, E., and Willensdorfer, M. Tue .
"Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak". United States. https://doi.org/10.1088/1741-4326/aace93. https://www.osti.gov/servlets/purl/1468580.
@article{osti_1468580,
title = {Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak},
author = {Suttrop, W. and Kirk, A. and Bobkov, V. and Cavedon, M. and Dunne, M. and McDermott, R. M. and Meyer, H. and Nazikian, R. and Paz-Soldan, C. and Ryan, D. A. and Viezzer, E. and Willensdorfer, M.},
abstractNote = {For this, access conditions for full suppression of Edge Localised Modes (ELMs) by Magnetic Perturbations (MP) in low density high confinement mode (H-mode) plasmas are studied in the ASDEX Upgrade tokamak. The main empirical requirements for full ELM suppression in our experiments are: 1. The poloidal spectrum of the MP must be aligned for best plasma response from weakly stable kink-modes, which amplify the perturbation, 2. The plasma edge density must be below a critical value, 3.3 × 1019 m-3. The edge collisionality is in the range v$*\atop{i}$ = 0.15 - 0.42 (ions) and v$*\atop{e}$ = 0.15 - 0.25 (electrons). However, our data does not show that the edge collisionality is the critical parameter that governs access to ELM suppression. 3. The pedestal pressure must be kept sufficiently low to avoid destabilisation of small ELMs. This requirement implies a systematic reduction of pedestal pressure of typically 30% compared to unmitigated ELMy H-mode in otherwise similar plasmas. 4. The edge safety factor q95 lies within a certain window. Within the range probed so far, q95 = 3.5 - 4.2, one such window, q95 = 3.57-3.95 has been identified. Within the range of plasma rotation encountered so far, no apparent threshold of plasma rotation for ELM suppression is found. This includes cases with large cross field electron flow in the entire pedestal region.},
doi = {10.1088/1741-4326/aace93},
journal = {Nuclear Fusion},
number = 9,
volume = 58,
place = {United States},
year = {Tue Jul 17 00:00:00 EDT 2018},
month = {Tue Jul 17 00:00:00 EDT 2018}
}
Web of Science
Works referenced in this record:
Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations
journal, July 2012
- Jeon, Y. M.; Park, J. -K.; Yoon, S. W.
- Physical Review Letters, Vol. 109, Issue 3
Parameter dependence of ELM loss reduction by magnetic perturbations at low pedestal density and collisionality in ASDEX upgrade
journal, March 2017
- Leuthold, N.; Suttrop, W.; Fischer, R.
- Plasma Physics and Controlled Fusion, Vol. 59, Issue 5
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
Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
journal, July 1999
- Sauter, O.; Angioni, C.; Lin-Liu, Y. R.
- Physics of Plasmas, Vol. 6, Issue 7
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
Plasma response measurements of external magnetic perturbations using electron cyclotron emission and comparisons to 3D ideal MHD equilibrium
journal, September 2016
- Willensdorfer, M.; Denk, S. S.; Strumberger, E.
- Plasma Physics and Controlled Fusion, Vol. 58, Issue 11
Field-Line Localized Destabilization of Ballooning Modes in Three-Dimensional Tokamaks
journal, August 2017
- Willensdorfer, M.; Cote, T. B.; Hegna, C. C.
- Physical Review Letters, Vol. 119, Issue 8
MHD instabilities in 3D tokamaks
journal, May 2014
- Strumberger, E.; Günter, S.; Tichmann, C.
- Nuclear Fusion, Vol. 54, Issue 6
Effect of resonant magnetic perturbations on low collisionality discharges in MAST and a comparison with ASDEX Upgrade
journal, March 2015
- Kirk, A.; Suttrop, W.; Chapman, I. T.
- Nuclear Fusion, Vol. 55, Issue 4
Experience With High-$Z$ Plasma-Facing Materials and Extrapolation to Future Devices
journal, March 2010
- Neu, R. L.
- IEEE Transactions on Plasma Science, Vol. 38, Issue 3
Chapter 2: Plasma confinement and transport
journal, December 1999
- Transport, ITER Physics Expert Group on Confin; Database, ITER Physics Expert Group on Confin; Editors, ITER Physics Basis
- Nuclear Fusion, Vol. 39, Issue 12
Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-Da)
journal, May 2015
- Grierson, B. A.; Burrell, K. H.; Nazikian, R. M.
- Physics of Plasmas, Vol. 22, Issue 5
Ideal magnetohydrodynamic stability of the tokamak high-confinement-mode edge region
journal, May 1999
- Wilson, H. R.; Connor, J. W.; Field, A. R.
- Physics of Plasmas, Vol. 6, Issue 5
Mitigation of edge localised modes with magnetic perturbations in ASDEX Upgrade
journal, October 2013
- Suttrop, W.; Fuchs, J. C.; Fischer, R.
- Fusion Engineering and Design, Vol. 88, Issue 6-8
Z dependence of the core impurity transport in ASDEX Upgrade H mode discharges
journal, November 1999
- Dux, R.; Peeters, A. G.; Gude, A.
- Nuclear Fusion, Vol. 39, Issue 11
Collisionality dependence of edge rotation and in–out impurity asymmetries in ASDEX Upgrade H-mode plasmas
journal, October 2015
- Viezzer, E.; Fable, E.; Pütterich, T.
- Nuclear Fusion, Vol. 55, Issue 12
Experimental studies of high-confinement mode plasma response to non-axisymmetric magnetic perturbations in ASDEX Upgrade
journal, November 2016
- Suttrop, W.; Kirk, A.; Nazikian, R.
- Plasma Physics and Controlled Fusion, Vol. 59, Issue 1
MHD instabilities in 3D tokamaks
journal, May 2014
- Strumberger, E.; Günter, S.; Tichmann, C.
- Nuclear Fusion, Vol. 54, Issue 6
Reduced charge state equations that describe Pfirsch Schlüter impurity transport in tokamak plasma
journal, January 2000
- Peeters, A. G.
- Physics of Plasmas, Vol. 7, Issue 1
High-accuracy characterization of the edge radial electric field at ASDEX Upgrade
journal, April 2013
- Viezzer, E.; Pütterich, T.; Conway, G. D.
- Nuclear Fusion, Vol. 53, 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
High-resolution charge exchange measurements at ASDEX Upgrade
journal, October 2012
- Viezzer, E.; Pütterich, T.; Dux, R.
- Review of Scientific Instruments, Vol. 83, Issue 10
Connection between plasma response and resonant magnetic perturbation (RMP) edge localized mode (ELM) suppression in DIII-D
journal, September 2015
- Wingen, A.; Ferraro, N. M.; Shafer, M. W.
- Plasma Physics and Controlled Fusion, Vol. 57, Issue 10
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
Screening of resonant magnetic perturbations by flows in tokamaks
journal, May 2012
- Becoulet, M.; Orain, F.; Maget, P.
- Nuclear Fusion, Vol. 52, Issue 5
In-vessel saddle coils for MHD control in ASDEX Upgrade
journal, June 2009
- Suttrop, W.; Gruber, O.; Günter, S.
- Fusion Engineering and Design, Vol. 84, Issue 2-6
Effect of island overlap on edge localized mode suppression by resonant magnetic perturbations in DIII-D
journal, May 2008
- Fenstermacher, M. E.; Evans, T. E.; Osborne, T. H.
- Physics of Plasmas, Vol. 15, Issue 5
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
Studies of edge localized mode mitigation with new active in-vessel saddle coils in ASDEX Upgrade
journal, November 2011
- Suttrop, W.; Barrera, L.; Herrmann, A.
- Plasma Physics and Controlled Fusion, Vol. 53, Issue 12
Gyrokinetic neoclassical study of the bootstrap current in the tokamak edge pedestal with fully non-linear Coulomb collisions
journal, April 2016
- Hager, Robert; Chang, C. S.
- Physics of Plasmas, Vol. 23, Issue 4
Identification of plasma-edge-related operational regime boundaries and the effect of edge instability on confinement in ASDEX Upgrade
journal, December 1997
- Suttrop, W.; Kaufmann, M.; Blank, H. J. de
- Plasma Physics and Controlled Fusion, Vol. 39, Issue 12
Electrical design of the BUSSARD inverter system for ASDEX upgrade saddle coils
journal, October 2015
- Teschke, Markus; Arden, Nils; Eixenberger, Horst
- Fusion Engineering and Design, Vol. 96-97
Three dimensional boundary displacement due to stable ideal kink modes excited by external n = 2 magnetic perturbations
journal, August 2017
- Willensdorfer, M.; Strumberger, E.; Suttrop, W.
- Nuclear Fusion, Vol. 57, Issue 11
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
First Observation of Edge Localized Modes Mitigation with Resonant and Nonresonant Magnetic Perturbations in ASDEX Upgrade
journal, June 2011
- Suttrop, W.; Eich, T.; Fuchs, J. C.
- Physical Review Letters, Vol. 106, Issue 22
Non-linear magnetohydrodynamic modeling of plasma response to resonant magnetic perturbations
journal, October 2013
- Orain, F.; Bécoulet, M.; Dif-Pradalier, G.
- Physics of Plasmas, Vol. 20, Issue 10
Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary
journal, June 2004
- Evans, T. E.; Moyer, R. A.; Thomas, P. R.
- Physical Review Letters, Vol. 92, Issue 23
First results with 3-strap ICRF antennas in ASDEX Upgrade
journal, July 2016
- Bobkov, V.; Braun, F.; Dux, R.
- Nuclear Fusion, Vol. 56, Issue 8
Overview of ASDEX Upgrade results
journal, June 2017
- Kallenbach, A.
- Nuclear Fusion, Vol. 57, Issue 10
Works referencing / citing this record:
A non-axisymmetric E × B shear inducing toroidally localized turbulence with an applied magnetic perturbation field in EAST
journal, November 2019
- Hu, G. H.; Chen, R.; Xu, G. S.
- Nuclear Fusion, Vol. 60, Issue 1
Non-linear modeling of the threshold between ELM mitigation and ELM suppression by Resonant Magnetic Perturbations in ASDEX Upgrade
text, January 2019
- Orain, François; Hoelzl, M.; Mink, F.
- arXiv
Screening of resonant magnetic perturbation fields by poloidally varying toroidal plasma rotation
journal, August 2018
- Li, L.; Liu, Y. Q.; Loarte, A.
- Physics of Plasmas, Vol. 25, Issue 8
The effect of plasma shape and neutral beam mix on the rotation threshold for RMP-ELM suppression
journal, March 2019
- Paz-Soldan, C.; Nazikian, R.; Cui, L.
- Nuclear Fusion, Vol. 59, Issue 5
Tamed stability and transport using controlled non-axisymmetric fields in KSTAR
journal, March 2019
- In, Yongkyoon; Jeon, Y. M.; Park, J. -K.
- Nuclear Fusion, Vol. 59, Issue 5
Effect of magnetic perturbations for ELM control on divertor power loads, detachment and consequences of field penetration in ASDEX Upgrade
journal, November 2018
- Faitsch, M.; Sieglin, B.; Brida, D.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 1
Non-linear modeling of the threshold between ELM mitigation and ELM suppression by resonant magnetic perturbations in ASDEX upgrade
journal, April 2019
- Orain, F.; Hoelzl, M.; Mink, F.
- Physics of Plasmas, Vol. 26, Issue 4
Numerical survey of predicted peeling response in edge localised mode mitigated and suppressed phases on ASDEX upgrade
journal, August 2019
- Ryan, D. A.; Dunne, M.; Kirk, A.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 9
ICRF coupling in ASDEX upgrade magnetically perturbed 3D plasmas
journal, November 2019
- López, G. Suárez; Ochoukov, R.; Tierens, W.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 12
Topological bifurcation of magnetic islands in NSTX-U
journal, April 2019
- Wu, W.; Evans, T. E.; Canal, G. P.
- Nuclear Fusion, Vol. 59, Issue 6
27th IAEA Fusion Energy Conference: summary of sessions EX/C, EX/S and PPC
journal, January 2020
- Campbell, D. J.
- Nuclear Fusion, Vol. 60, Issue 2
Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations
journal, November 2018
- Willensdorfer, M.; Cote, T. B.; Griener, M.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 1
Intrinsic rotation in axisymmetric devices
journal, November 2019
- Stoltzfus-Dueck, T.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 12
Non-axisymmetric equilibrium and stability using the ELITE stability code
journal, October 2019
- Anastopoulos-Tzanis, M. S.; Dudson, B. D.; Ham, C. J.
- Nuclear Fusion, Vol. 59, Issue 12
Active conditioning of ASDEX Upgrade tungsten plasma-facing components and discharge enhancement through boron and boron nitride particulate injection
journal, October 2019
- Lunsford, R.; Rohde, V.; Bortolon, A.
- Nuclear Fusion, Vol. 59, Issue 12