The quiescent H-mode regime for high performance edge localized mode-stable operation in future burning plasmas [The quiescent H-mode regime for high performance ELM-stable operation in future burning plasmas]
Abstract
For the first time, DIII-D experiments have achieved stationary quiescent H-mode (QH-mode) operation for many energy confinement times at simultaneous ITER-relevant values of beta, confinement, and safety factor, in an ITER similar shape. QH-mode provides excellent energy confinement, even at very low plasma rotation, while operating without edge localized modes (ELMs) and with strong impurity transport via the benign edge harmonic oscillation (EHO). By tailoring the plasma shape to improve the edge stability, the QH-mode operating space has also been extended to densities exceeding 80% of the Greenwald limit, overcoming the long-standing low-density limit of QH-mode operation. In the theory, the density range over which the plasma encounters the kink-peeling boundary widens as the plasma cross-section shaping is increased, thus increasing the QH-mode density threshold. Here, the DIII-D results are in excellent agreement with these predictions, and nonlinear MHD analysis of reconstructed QH-mode equilibria shows unstable low n kink-peeling modes growing to a saturated level, consistent with the theoretical picture of the EHO. Furthermore, high density operation in the QH-mode regime has opened a path to a new, previously predicted region of parameter space, named “Super H-mode” because it is characterized by very high pedestals that can be more thanmore »
- Authors:
-
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Columbia Univ., New York, NY (United States)
- Univ. of California San Diego, La Jolla, CA (United States)
- ITER Organization, St. Paul Lez Durance (France)
- Univ. of California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1350084
- Alternate Identifier(s):
- OSTI ID: 1228312
- Grant/Contract Number:
- FC02-04ER54698; AC02-09CH11466; FG02-04ER54761; FG02-07ER54917; FG02-08ER54984
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 5; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Garofalo, Andrea M., Burrell, Keith H., Eldon, David, Grierson, Brian A., Hanson, Jeremy M., Holland, Christopher, Huijsmans, Guido T. A., Liu, Feng, Loarte, Alberto, Meneghini, Orso, Osborne, T. H., Paz-Soldan, C., Smith, S. P., Snyder, P. B., Solomon, W. M., Turnbull, A. D., and Zeng, L. The quiescent H-mode regime for high performance edge localized mode-stable operation in future burning plasmas [The quiescent H-mode regime for high performance ELM-stable operation in future burning plasmas]. United States: N. p., 2015.
Web. doi:10.1063/1.4921406.
Garofalo, Andrea M., Burrell, Keith H., Eldon, David, Grierson, Brian A., Hanson, Jeremy M., Holland, Christopher, Huijsmans, Guido T. A., Liu, Feng, Loarte, Alberto, Meneghini, Orso, Osborne, T. H., Paz-Soldan, C., Smith, S. P., Snyder, P. B., Solomon, W. M., Turnbull, A. D., & Zeng, L. The quiescent H-mode regime for high performance edge localized mode-stable operation in future burning plasmas [The quiescent H-mode regime for high performance ELM-stable operation in future burning plasmas]. United States. https://doi.org/10.1063/1.4921406
Garofalo, Andrea M., Burrell, Keith H., Eldon, David, Grierson, Brian A., Hanson, Jeremy M., Holland, Christopher, Huijsmans, Guido T. A., Liu, Feng, Loarte, Alberto, Meneghini, Orso, Osborne, T. H., Paz-Soldan, C., Smith, S. P., Snyder, P. B., Solomon, W. M., Turnbull, A. D., and Zeng, L. Tue .
"The quiescent H-mode regime for high performance edge localized mode-stable operation in future burning plasmas [The quiescent H-mode regime for high performance ELM-stable operation in future burning plasmas]". United States. https://doi.org/10.1063/1.4921406. https://www.osti.gov/servlets/purl/1350084.
@article{osti_1350084,
title = {The quiescent H-mode regime for high performance edge localized mode-stable operation in future burning plasmas [The quiescent H-mode regime for high performance ELM-stable operation in future burning plasmas]},
author = {Garofalo, Andrea M. and Burrell, Keith H. and Eldon, David and Grierson, Brian A. and Hanson, Jeremy M. and Holland, Christopher and Huijsmans, Guido T. A. and Liu, Feng and Loarte, Alberto and Meneghini, Orso and Osborne, T. H. and Paz-Soldan, C. and Smith, S. P. and Snyder, P. B. and Solomon, W. M. and Turnbull, A. D. and Zeng, L.},
abstractNote = {For the first time, DIII-D experiments have achieved stationary quiescent H-mode (QH-mode) operation for many energy confinement times at simultaneous ITER-relevant values of beta, confinement, and safety factor, in an ITER similar shape. QH-mode provides excellent energy confinement, even at very low plasma rotation, while operating without edge localized modes (ELMs) and with strong impurity transport via the benign edge harmonic oscillation (EHO). By tailoring the plasma shape to improve the edge stability, the QH-mode operating space has also been extended to densities exceeding 80% of the Greenwald limit, overcoming the long-standing low-density limit of QH-mode operation. In the theory, the density range over which the plasma encounters the kink-peeling boundary widens as the plasma cross-section shaping is increased, thus increasing the QH-mode density threshold. Here, the DIII-D results are in excellent agreement with these predictions, and nonlinear MHD analysis of reconstructed QH-mode equilibria shows unstable low n kink-peeling modes growing to a saturated level, consistent with the theoretical picture of the EHO. Furthermore, high density operation in the QH-mode regime has opened a path to a new, previously predicted region of parameter space, named “Super H-mode” because it is characterized by very high pedestals that can be more than a factor of two above the peeling-ballooning stability limit for similar ELMing H-mode discharges at the same density.},
doi = {10.1063/1.4921406},
journal = {Physics of Plasmas},
number = 5,
volume = 22,
place = {United States},
year = {Tue May 26 00:00:00 EDT 2015},
month = {Tue May 26 00:00:00 EDT 2015}
}
Web of Science
Works referenced in this record:
Quiescent H-mode plasmas in the DIII-D tokamak
journal, April 2002
- Burrell, K. H.; Austin, M. E.; Brennan, D. P.
- Plasma Physics and Controlled Fusion, Vol. 44, Issue 5A
Chapter 1: Overview and summary
journal, June 2007
- Shimada, M.; Campbell, D. J.; Mukhovatov, V.
- Nuclear Fusion, Vol. 47, Issue 6
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
Collisionality dependence of density peaking in quasilinear gyrokinetic calculations
journal, November 2005
- Angioni, C.; Peeters, A. G.; Jenko, F.
- Physics of Plasmas, Vol. 12, Issue 11
Requirements for pellet injection in ITER scenarios with enhanced particle confinement
journal, October 2005
- Polevoi, A. R.; Shimada, M.; Sugihara, M.
- Nuclear Fusion, Vol. 45, Issue 11
Advances towards QH-mode viability for ELM-stable operation in ITER
journal, July 2011
- Garofalo, A. M.; Solomon, W. M.; Park, J. -K.
- Nuclear Fusion, Vol. 51, Issue 8
Quiescent H-mode operation using torque from non-axisymmetric, non-resonant magnetic fields
journal, June 2013
- Burrell, K. H.; Garofalo, A. M.; Solomon, W. M.
- Nuclear Fusion, Vol. 53, Issue 7
Sustained Stabilization of the Resistive-Wall Mode by Plasma Rotation in the DIII-D Tokamak
journal, November 2002
- Garofalo, A. M.; Strait, E. J.; Johnson, L. C.
- Physical Review Letters, Vol. 89, Issue 23
Localized MHD activity near internal transport barriers in JT-60U and TFTR
journal, November 1999
- Manickam, J.; Fujita, T.; Gorelenkov, N.
- Nuclear Fusion, Vol. 39, Issue 11Y
Ideal MHD stability of high p plasmas and p collapse in JT-60U
journal, July 1995
- Ozeki, T.; Azumi, M.; Kamada, Y.
- Nuclear Fusion, Vol. 35, Issue 7
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
GATO: An MHD stability code for axisymmetric plasmas with internal separatrices
journal, December 1981
- Bernard, L. C.; Helton, F. J.; Moore, R. W.
- Computer Physics Communications, Vol. 24, Issue 3-4
Density limits in toroidal plasmas
journal, July 2002
- Greenwald, Martin
- Plasma Physics and Controlled Fusion, Vol. 44, Issue 8
Edge stability of stationary ELM-suppressed regimes on DIII-D
journal, July 2008
- Osborne, T. H.; Snyder, P. B.; Burrell, K. H.
- Journal of Physics: Conference Series, Vol. 123
Stability and dynamics of the edge pedestal in the low collisionality regime: physics mechanisms for steady-state ELM-free operation
journal, August 2007
- Snyder, P. B.; Burrell, K. H.; Wilson, H. R.
- Nuclear Fusion, Vol. 47, Issue 8
Advances in understanding quiescent H-mode plasmas in DIII-D
journal, May 2005
- Burrell, K. H.; West, W. P.; Doyle, E. J.
- Physics of Plasmas, Vol. 12, Issue 5
Access to a New Plasma Edge State with High Density and Pressures using the Quiescent Mode
journal, September 2014
- Solomon, W. M.; Snyder, P. B.; Burrell, K. H.
- Physical Review Letters, Vol. 113, Issue 13
Extending the physics basis of quiescent H-mode toward ITER relevant parameters
journal, June 2015
- Solomon, W. M.; Burrell, K. H.; Fenstermacher, M. E.
- Nuclear Fusion, Vol. 55, Issue 7
Development and validation of a predictive model for the pedestal height
journal, May 2009
- Snyder, P. B.; Groebner, R. J.; Leonard, A. W.
- Physics of Plasmas, Vol. 16, Issue 5
Super H-mode: theoretical prediction and initial observations of a new high performance regime for tokamak operation
journal, July 2015
- Snyder, P. B.; Solomon, W. M.; Burrell, K. H.
- Nuclear Fusion, Vol. 55, Issue 8
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
Nonlinear MHD simulations of Quiescent H-mode plasmas in DIII-D
journal, September 2015
- Liu, F.; Huijsmans, G. T. A.; Loarte, A.
- Nuclear Fusion, Vol. 55, Issue 11
Non-linear MHD simulations of edge localized modes (ELMs)
journal, November 2009
- Huysmans, G. T. A.; Pamela, S.; van der Plas, E.
- Plasma Physics and Controlled Fusion, Vol. 51, Issue 12
Performance and data analysis aspects of the new DIII-D monostatic profile reflectometer system
journal, November 2014
- Zeng, L.; Peebles, W. A.; Doyle, E. J.
- Review of Scientific Instruments, Vol. 85, Issue 11
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
Response of impurity particle confinement time to external actuators in QH-mode plasmas on DIII-D
journal, November 2014
- Grierson, B. A.; Burrell, K. H.; Garofalo, A. M.
- Nuclear Fusion, Vol. 54, Issue 11
Works referencing / citing this record:
Summary of magnetic fusion plasma physics in 1st AAPPS-DPP meeting
journal, March 2018
- Li, Jiangang; Zhong, Wulyu
- Reviews of Modern Plasma Physics, Vol. 2, Issue 1
Discovery of stationary operation of quiescent H-mode plasmas with net-zero neutral beam injection torque and high energy confinement on DIII-D
journal, March 2016
- Burrell, K. H.; Barada, K.; Chen, X.
- Physics of Plasmas, Vol. 23, Issue 5
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
Numerical estimation of the oxygen impurity transport in the Aditya tokamak
journal, February 2020
- Bhattacharya, Amrita; Ghosh, Joydeep; Chowdhuri, M. B.
- Physics of Plasmas, Vol. 27, Issue 2
Helical equilibrium magnetohydrodynamic flow effects on the stability properties of low- n ideal external-infernal modes in weak shear tokamak configurations
journal, April 2019
- Brunetti, D.; Graves, J. P.; Lazzaro, E.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 6
Experimental characterization of the effect of E × B shear on edge-harmonic oscillation mode structure
journal, June 2019
- Chen, M.; Luo, C.; Zhu, Y.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 8
Current and pressure gradient triggering and nonlinear saturation of low- n edge harmonic oscillations in tokamaks
journal, June 2019
- Kleiner, A.; Graves, J. P.; Brunetti, D.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 8
Access and sustainment of naturally ELM-free and small-ELM regimes
journal, September 2018
- Viezzer, E.
- Nuclear Fusion, Vol. 58, Issue 11
Scaling trends of the critical E × B shear for edge harmonic oscillation onset in DIII-D quiescent H-mode plasmas
journal, September 2018
- Wilks, T. M.; Garofalo, A. M.; Diamond, P. H.
- Nuclear Fusion, Vol. 58, Issue 11
Long-lived coupled peeling ballooning modes preceding ELMs on JET
journal, March 2019
- Perez von Thun, C.; Frassinetti, L.; Horvath, L.
- Nuclear Fusion, Vol. 59, Issue 5
Progress of the CFETR design
journal, June 2019
- Zhuang, G.; Li, G. Q.; Li, J.
- Nuclear Fusion, Vol. 59, Issue 11
High fusion performance in Super H-mode experiments on Alcator C-Mod and DIII-D
journal, June 2019
- Snyder, P. B.; Hughes, J. W.; Osborne, T. H.
- Nuclear Fusion, Vol. 59, Issue 8