Impact of ideal MHD stability limits on high-beta hybrid operation
Abstract
The hybrid scenario is a candidate for stationary high-fusion gain tokamak operation in ITER and DEMO. To obtain such performance, the energy confinement and the normalized pressure βN must be maximized, which requires operating near or above ideal MHD no-wall limits. New experimental findings show how these limits can affect hybrid operation. Even if hybrids are mainly limited by tearing modes, proximity to the no-wall limit leads to 3D field amplification that affects plasma profiles, e.g. rotation braking is observed in ASDEX Upgrade throughout the plasma and peaks in the core. As a result, even the small ASDEX Upgrade error fields are amplified and their effects become visible. To quantify such effects, ASDEX Upgrade measured the response to 3D elds applied by 8 2 non-axisymmetric coils as N approaches the no-wall limit. The full n = 1 response profile and poloidal structure are measured by a suite of diagnostics and compared with linear MHD simulations, revealing a characteristic feature of hybrids: the n = 1 response is due to a global, marginally-stable n = 1 kink characterized by a large m = 1; n = 1 core harmonic due to qmin being just above 1. A helical core distortion ofmore »
- Authors:
-
more »
- Consorzio RFX, Padova (Italy)
- Max-Planck-Institut fur Plasmaphysik, Garching (Germany)
- Columbia Univ., New York, NY (United States)
- Univ. of York, York (United Kingdom)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Culham Science Centre, Abingdon (United Kingdom)
- Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- DIFFER, Nieuwegein (The Netherlands)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- Contributing Org.:
- The ASDEX Upgrade Team; The DIII-D Team; The EUROfusion MST1 Team
- OSTI Identifier:
- 1336246
- Alternate Identifier(s):
- OSTI ID: 1375933; OSTI ID: 1376540
- Grant/Contract Number:
- FC02-04ER54698; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 1; Journal ID: ISSN 0741-3335
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; hybrid scenario; MHD stability; 3D equilibrium
Citation Formats
Piovesan, Paolo, Igochine, V., Turco, F., Ryan, D. A., Cianciosa, M. R., Liu, Y. Q., Marrelli, L., Terranova, D., Wilcox, R. S., Wingen, A., Angioni, C., Bock, A., Chrystal, C., Classen, I., Dunne, M., Ferraro, N. M., Fischer, R., Gude, A., Holcomb, C. T., Lebschy, A., Luce, T. C., Maraschek, M., McDermott, R., Odstrcil, T., Paz-Soldan, C., Reich, M., Sertoli, M., Suttrop, W., Taylor, N. Z., Weiland, M., and Willensdorfer, M. Impact of ideal MHD stability limits on high-beta hybrid operation. United States: N. p., 2016.
Web. doi:10.1088/0741-3335/59/1/014027.
Piovesan, Paolo, Igochine, V., Turco, F., Ryan, D. A., Cianciosa, M. R., Liu, Y. Q., Marrelli, L., Terranova, D., Wilcox, R. S., Wingen, A., Angioni, C., Bock, A., Chrystal, C., Classen, I., Dunne, M., Ferraro, N. M., Fischer, R., Gude, A., Holcomb, C. T., Lebschy, A., Luce, T. C., Maraschek, M., McDermott, R., Odstrcil, T., Paz-Soldan, C., Reich, M., Sertoli, M., Suttrop, W., Taylor, N. Z., Weiland, M., & Willensdorfer, M. Impact of ideal MHD stability limits on high-beta hybrid operation. United States. https://doi.org/10.1088/0741-3335/59/1/014027
Piovesan, Paolo, Igochine, V., Turco, F., Ryan, D. A., Cianciosa, M. R., Liu, Y. Q., Marrelli, L., Terranova, D., Wilcox, R. S., Wingen, A., Angioni, C., Bock, A., Chrystal, C., Classen, I., Dunne, M., Ferraro, N. M., Fischer, R., Gude, A., Holcomb, C. T., Lebschy, A., Luce, T. C., Maraschek, M., McDermott, R., Odstrcil, T., Paz-Soldan, C., Reich, M., Sertoli, M., Suttrop, W., Taylor, N. Z., Weiland, M., and Willensdorfer, M. Thu .
"Impact of ideal MHD stability limits on high-beta hybrid operation". United States. https://doi.org/10.1088/0741-3335/59/1/014027. https://www.osti.gov/servlets/purl/1336246.
@article{osti_1336246,
title = {Impact of ideal MHD stability limits on high-beta hybrid operation},
author = {Piovesan, Paolo and Igochine, V. and Turco, F. and Ryan, D. A. and Cianciosa, M. R. and Liu, Y. Q. and Marrelli, L. and Terranova, D. and Wilcox, R. S. and Wingen, A. and Angioni, C. and Bock, A. and Chrystal, C. and Classen, I. and Dunne, M. and Ferraro, N. M. and Fischer, R. and Gude, A. and Holcomb, C. T. and Lebschy, A. and Luce, T. C. and Maraschek, M. and McDermott, R. and Odstrcil, T. and Paz-Soldan, C. and Reich, M. and Sertoli, M. and Suttrop, W. and Taylor, N. Z. and Weiland, M. and Willensdorfer, M.},
abstractNote = {The hybrid scenario is a candidate for stationary high-fusion gain tokamak operation in ITER and DEMO. To obtain such performance, the energy confinement and the normalized pressure βN must be maximized, which requires operating near or above ideal MHD no-wall limits. New experimental findings show how these limits can affect hybrid operation. Even if hybrids are mainly limited by tearing modes, proximity to the no-wall limit leads to 3D field amplification that affects plasma profiles, e.g. rotation braking is observed in ASDEX Upgrade throughout the plasma and peaks in the core. As a result, even the small ASDEX Upgrade error fields are amplified and their effects become visible. To quantify such effects, ASDEX Upgrade measured the response to 3D elds applied by 8 2 non-axisymmetric coils as N approaches the no-wall limit. The full n = 1 response profile and poloidal structure are measured by a suite of diagnostics and compared with linear MHD simulations, revealing a characteristic feature of hybrids: the n = 1 response is due to a global, marginally-stable n = 1 kink characterized by a large m = 1; n = 1 core harmonic due to qmin being just above 1. A helical core distortion of a few cm forms and affects various core quantities, including plasma rotation, electron and ion temperature, and intrinsic W density. In similar experiments, DIII-D also measured the effect of this helical core on the internal current profile, providing useful information to understand the physics of magnetic flux pumping, i.e. anomalous current redistribution by MHD modes that keeps qmin > 1. Thanks to flux pumping, a broad current profile is maintained in DIII-D even with large on-axis current drive, enabling fully non-inductive operation at high βN up to 3.5 - 4.},
doi = {10.1088/0741-3335/59/1/014027},
journal = {Plasma Physics and Controlled Fusion},
number = 1,
volume = 59,
place = {United States},
year = {Thu Oct 27 00:00:00 EDT 2016},
month = {Thu Oct 27 00:00:00 EDT 2016}
}
Web of Science
Works referenced in this record:
Long pulse high performance discharges in the DIII-D tokamak
journal, November 2001
- Luce, T. C.; Wade, M. R.; Politzer, P. A.
- Nuclear Fusion, Vol. 41, Issue 11
Steady state advanced scenarios at ASDEX Upgrade
journal, November 2002
- Sips, A. C. C.; Arslanbekov, R.; Atanasiu, C.
- Plasma Physics and Controlled Fusion, Vol. 44, Issue 12B
Integrated scenario in JET using real-time profile control
journal, November 2003
- Joffrin, E.; Crisanti, F.; Felton, R.
- Plasma Physics and Controlled Fusion, Vol. 45, Issue 12A
Compatibility of ITER scenarios with full tungsten wall in ASDEX Upgrade
journal, September 2009
- Gruber, O.; Sips, A. C. C.; Dux, R.
- Nuclear Fusion, Vol. 49, Issue 11
Magnetic-Flux Pumping in High-Performance, Stationary Plasmas with Tearing Modes
journal, January 2009
- Petty, C. C.; Austin, M. E.; Holcomb, C. T.
- Physical Review Letters, Vol. 102, Issue 4
The high-βN hybrid scenario for ITER and FNSF steady-state missionsa)
journal, May 2015
- Turco, F.; Petty, C. C.; Luce, T. C.
- Physics of Plasmas, Vol. 22, Issue 5
High-beta, steady-state hybrid scenario on DIII-D
journal, December 2015
- Petty, C. C.; Kinsey, J. E.; Holcomb, C. T.
- Nuclear Fusion, Vol. 56, Issue 1
Error Field Amplification and Rotation Damping in Tokamak Plasmas
journal, May 2001
- Boozer, Allen H.
- Physical Review Letters, Vol. 86, Issue 22
Effects of 3D magnetic perturbations on toroidal plasmas
journal, August 2011
- Callen, J. D.
- Nuclear Fusion, Vol. 51, Issue 9
A mechanism for tearing onset near ideal stability boundaries
journal, May 2003
- Brennan, D. P.; La Haye, R. J.; Turnbull, A. D.
- Physics of Plasmas, Vol. 10, Issue 5
Resistive stability of 2∕1 modes near 1∕1 resonance
journal, May 2007
- Brennan, D. P.; Turnbull, A. D.; Chu, M. S.
- Physics of Plasmas, Vol. 14, Issue 5
MHD phenomena in advanced scenarios on ASDEX Upgrade and the influence of localized electron heating and current drive
journal, September 2001
- Günter, S.; Gude, A.; Hobirk, J.
- Nuclear Fusion, Vol. 41, Issue 9
Optimization of DIII-D advanced tokamak discharges with respect to the β limit
journal, May 2005
- Ferron, J. R.; Casper, T. A.; Doyle, E. J.
- Physics of Plasmas, Vol. 12, Issue 5
Access to sustained high-beta with internal transport barrier and negative central magnetic shear in DIII-D
journal, May 2006
- Garofalo, A. M.; Doyle, E. J.; Ferron, J. R.
- Physics of Plasmas, Vol. 13, Issue 5
Compatibility of internal transport barrier with steady-state operation in the high bootstrap fraction regime on DIII-D
journal, November 2015
- Garofalo, A. M.; Gong, X.; Grierson, B. A.
- Nuclear Fusion, Vol. 55, Issue 12
Chapter 1: ASDEX Upgrade - Introduction and Overview
journal, November 2003
- Herrmann, Albrecht; Gruber, Otto
- Fusion Science and Technology, Vol. 44, Issue 3
Feedback stabilization of nonaxisymmetric resistive wall modes in tokamaks. I. Electromagnetic model
journal, September 2000
- Liu, Y. Q.; Bondeson, A.; Fransson, C. M.
- Physics of Plasmas, Vol. 7, Issue 9
Calculations of two-fluid magnetohydrodynamic axisymmetric steady-states
journal, November 2009
- Ferraro, N. M.; Jardin, S. C.
- Journal of Computational Physics, Vol. 228, Issue 20
Steepest-descent moment method for three-dimensional magnetohydrodynamic equilibria
journal, January 1983
- Hirshman, S. P.
- Physics of Fluids, Vol. 26, Issue 12
V3FIT: a code for three-dimensional equilibrium reconstruction
journal, July 2009
- Hanson, James D.; Hirshman, Steven P.; Knowlton, Stephen F.
- Nuclear Fusion, Vol. 49, Issue 7
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
Electro-magnetic modeling of the planned active in-vessel coils at ASDEX Upgrade
journal, June 2009
- Rott, M.; Seidel, U.; Streibl, B.
- Fusion Engineering and Design, Vol. 84, Issue 7-11
Analytical solutions to the Grad–Shafranov equation for tokamak equilibrium with dissimilar source functions
journal, September 1999
- Mc Carthy, P. J.
- Physics of Plasmas, Vol. 6, Issue 9
Estimation of edge electron temperature profiles via forward modelling of the electron cyclotron radiation transport at ASDEX Upgrade
journal, December 2012
- Rathgeber, S. K.; Barrera, L.; Eich, T.
- Plasma Physics and Controlled Fusion, Vol. 55, Issue 2
Tokamak Magnetohydrodynamic Equilibrium States with Axisymmetric Boundary and a 3D Helical Core
journal, July 2010
- Cooper, W. A.; Graves, J. P.; Pochelon, A.
- Physical Review Letters, Vol. 105, Issue 3
Study of slow n = 1, m = 1 reconnection in JET discharges with low central magnetic shear
journal, June 2006
- Buratti, P.; Alper, B.; Annibaldi, S. V.
- Plasma Physics and Controlled Fusion, Vol. 48, Issue 7
Kink instabilities in high-beta JET advanced scenarios
journal, January 2012
- Buratti, P.; Baruzzo, M.; Buttery, R. J.
- Nuclear Fusion, Vol. 52, Issue 2
Toroidal self-consistent modeling of drift kinetic effects on the resistive wall mode
journal, November 2008
- Liu, Yueqiang; Chu, M. S.; Chapman, I. T.
- Physics of Plasmas, Vol. 15, Issue 11
Investigation of 3D tungsten distributions in (1,1) kink modes induced by toroidal plasma rotation
journal, July 2015
- Weiland, M.; Gude, A.; Igochine, V.
- Plasma Physics and Controlled Fusion, Vol. 57, Issue 8
Multi-view fast-ion D-alpha spectroscopy diagnostic at ASDEX Upgrade
journal, November 2013
- Geiger, B.; Dux, R.; McDermott, R. M.
- Review of Scientific Instruments, Vol. 84, Issue 11
Modification of impurity transport in the presence of saturated ( m , n ) = (1,1) MHD activity at ASDEX Upgrade
journal, May 2015
- Sertoli, M.; Dux, R.; Pütterich, T.
- Plasma Physics and Controlled Fusion, Vol. 57, Issue 7
Interplay between central ECRH and saturated ( m , n ) = (1, 1) MHD activity in mitigating tungsten accumulation at ASDEX Upgrade
journal, September 2015
- Sertoli, M.; Odstrcil, T.; Angioni, C.
- Nuclear Fusion, Vol. 55, Issue 11
Full linearized Fokker–Planck collisions in neoclassical transport simulations
journal, December 2011
- Belli, E. A.; Candy, J.
- Plasma Physics and Controlled Fusion, Vol. 54, Issue 1
The nonlinear gyro-kinetic flux tube code GKW
journal, December 2009
- Peeters, A. G.; Camenen, Y.; Casson, F. J.
- Computer Physics Communications, Vol. 180, Issue 12
Tungsten transport in JET H-mode plasmas in hybrid scenario, experimental observations and modelling
journal, July 2014
- Angioni, C.; Mantica, P.; Pütterich, T.
- Nuclear Fusion, Vol. 54, Issue 8
Non-linear magnetohydrodynamic simulations of density evolution in Tore Supra sawtoothing plasmas
journal, November 2012
- Nicolas, T.; Sabot, R.; Garbet, X.
- Physics of Plasmas, Vol. 19, Issue 11
Impurity behavior during sawtooth activity in tokamak plasmas
journal, January 2014
- Nicolas, T.; Lütjens, H.; Luciani, J. -F.
- Physics of Plasmas, Vol. 21, Issue 1
Comparison of particle trajectories and collision operators for collisional transport in nonaxisymmetric plasmas
journal, April 2014
- Landreman, M.; Smith, H. M.; Mollén, A.
- Physics of Plasmas, Vol. 21, Issue 4
Recent Progress in NEO-2 — A Code for Neoclassical Transport Computations Based on Field Line Tracing
journal, January 2008
- Kernbichler, Winfried; Kasilov, Sergei V.; Leitold, Georg O.
- Plasma and Fusion Research, Vol. 3, Issue 0
Evaluation of the toroidal torque driven by external non-resonant non-axisymmetric magnetic field perturbations in a tokamak
journal, September 2014
- Kasilov, Sergei V.; Kernbichler, Winfried; Martitsch, Andreas F.
- Physics of Plasmas, Vol. 21, Issue 9
Dominant Electrostatic Nature of the Reversed Field Pinch Dynamo
journal, April 2005
- Bonfiglio, D.; Cappello, S.; Escande, D. F.
- Physical Review Letters, Vol. 94, Issue 14
Self-Organized Stationary States of Tokamaks
journal, November 2015
- Jardin, S. C.; Ferraro, N.; Krebs, I.
- Physical Review Letters, Vol. 115, Issue 21
Development, physics basis and performance projections for hybrid scenario operation in ITER on DIII-D
journal, May 2005
- Wade, M. R.; Luce, T. C.; Jayakumar, R. J.
- Nuclear Fusion, Vol. 45, Issue 6
Works referencing / citing this record:
Parametric dependencies of the experimental tungsten transport coefficients in ICRH and ECRH assisted ASDEX Upgrade H-modes
journal, November 2017
- Sertoli, M.; Angioni, C.; Odstrcil, T.
- Physics of Plasmas, Vol. 24, Issue 11
Toroidal modeling of interaction between internal kink mode and plasma flow
journal, September 2018
- Zhang, N.; Liu, Y. Q.; Wang, S.
- Physics of Plasmas, Vol. 25, Issue 9
Helical core formation and evolution during current ramp-up in the high-field tokamak Alcator C-Mod
journal, February 2019
- Wingen, A.; Wilcox, R. S.; Delgado-Aparicio, L. F.
- Physics of Plasmas, Vol. 26, Issue 2
Experimental validation of coil phase parametrisation on ASDEX Upgrade, and extension to ITER
journal, April 2018
- Ryan, D. A.; Liu, Y. Q.; Kirk, A.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 6
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
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
Experimental observations of an n = 1 helical core accompanied by a saturated m / n = 2/1 tearing mode with low mode frequencies in JT-60U
journal, October 2019
- Bando, T.; Matsunaga, G.; Takechi, M.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 11
Use of reconstructed 3D equilibria to determine onset conditions of helical cores in tokamaks for extrapolation to ITER
journal, January 2018
- Wingen, A.; Wilcox, R. S.; Seal, S. K.
- Nuclear Fusion, Vol. 58, Issue 3
Subdominant modes and optimization trends of DIII-D reverse magnetic shear configurations
journal, February 2019
- Varela, J.; Spong, D. A.; Murakami, M.
- Nuclear Fusion, Vol. 59, Issue 4
Impact of n = 1 field on the non-axisymmetric magnetic perturbations associated with the edge localized mode crashes in the ASDEX Upgrade tokamak
journal, March 2019
- Wang, Nengchao; Liang, Yunfeng; Igochine, Valentin
- Nuclear Fusion, Vol. 59, Issue 5
Analysis of Alfven eigenmode destabilization in ITER using a Landau closure model
journal, June 2019
- Varela, J.; Spong, D. A.; Garcia, L.
- Nuclear Fusion, Vol. 59, Issue 7
Subdominant modes and optimization trends of DIII-D reverse magnetic shear configurations
text, January 2019
- Varela, J.; Spong, D. A.; Murakami, M.
- arXiv
Analysis of Alfven Eigenmode destabilization in ITER using a Landau closure model
text, January 2019
- Varela, J.; Spong, D. A.; Garcia, L.
- arXiv