Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque

Burrell, K. H.; Chen, Xi; Chrystal, C.; Ernst, D. R.; Grierson, B. A.; Haskey, S. R.; Osborne, T. H.; Paz-Soldan, C.; Wilks, T. M.

doi:10.1088/1741-4326/ab940d

Title: Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque

Journal Article · Fri Jul 03 00:00:00 UTC 2020 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ab940d · OSTI ID:1657515

^[1];

^[2];

^[2]; Ernst, D. R. ^[3];

^[4];

^[4]; Osborne, T. H. ^[2];

^[2]; Wilks, T. M. ^[3]

General Atomics, San Diego, CA (United States); General Atomics, Energy & Advanced Concepts, DIII-D
General Atomics, San Diego, CA (United States)
MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Recent experiments on DIII-D have shown it is possible to create and sustain wide pedestal quiescent H-mode (QH-mode) plasmas with zero net torque from neutral beam injection (NBI) for the full discharge duration. Wide pedestal QH-mode has many of the features of the previously investigated QH-mode while having the advantage of increased edge pedestal pressure and excellent energy confinement time. Both QH-mode variants operate without edge localized modes. Accordingly, these discharges demonstrate that significant input torque is not essential to the exploitation of wide pedestal QH-mode in future devices that are expected to have small or nonexistent NBI torque. In conclusion, developing operating conditions that allowed net zero torque access to wide pedestal QH-mode required implementing several techniques to avoid locked modes including minimizing intrinsic error fields, avoiding large sawteeth, and driving toroidal rotation via neoclassical toroidal viscosity.

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Research Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; SC0014264

OSTI ID:: 1657515

Report Number(s):: DOE-GA--54698

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 8 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (39)

The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library Pankin, Alexei; McCune, Douglas; Andre, Robert Computer Physics Communications, Vol. 159, Issue 3 https://doi.org/10.1016/j.cpc.2003.11.002	journal	June 2004
Quiescent double barrier high-confinement mode plasmas in the DIII-D tokamak Burrell, K. H.; Austin, M. E.; Brennan, D. P. Physics of Plasmas, Vol. 8, Issue 5 https://doi.org/10.1063/1.1355981	journal	May 2001
Error field locked modes thresholds in rotating plasmas, anomalous braking and spin-up Lazzaro, E.; Buttery, R. J.; Hender, T. C. Physics of Plasmas, Vol. 9, Issue 9 https://doi.org/10.1063/1.1499495	journal	September 2002
Nonaxisymmetric field effects on Alcator C-Mod Wolfe, S. M.; Hutchinson, I. H.; Granetz, R. S. Physics of Plasmas, Vol. 12, Issue 5 https://doi.org/10.1063/1.1883665	journal	May 2005
Advances in understanding quiescent H-mode plasmas in DIII-D Burrell, K. H.; West, W. P.; Doyle, E. J. Physics of Plasmas, Vol. 12, Issue 5 https://doi.org/10.1063/1.1894745	journal	May 2005
Mechanisms for generating toroidal rotation in tokamaks without external momentum input Solomon, W. M.; Burrell, K. H.; Garofalo, A. M. Physics of Plasmas, Vol. 17, Issue 5 https://doi.org/10.1063/1.3328521	journal	May 2010
Reactor-relevant quiescent H-mode operation using torque from non-axisymmetric, non-resonant magnetic fields Burrell, K. H.; Garofalo, A. M.; Solomon, W. M. Physics of Plasmas, Vol. 19, Issue 5 https://doi.org/10.1063/1.3695119	journal	May 2012
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 Snyder, P. B.; Osborne, T. H.; Burrell, K. H. Physics of Plasmas, Vol. 19, Issue 5 https://doi.org/10.1063/1.3699623	journal	May 2012
Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-Da) Grierson, B. A.; Burrell, K. H.; Nazikian, R. M. Physics of Plasmas, Vol. 22, Issue 5 https://doi.org/10.1063/1.4918359	journal	May 2015
The quiescent H-mode regime for high performance edge localized mode-stable operation in future burning plasmasa) Garofalo, A. M.; Burrell, K. H.; Eldon, D. Physics of Plasmas, Vol. 22, Issue 5 https://doi.org/10.1063/1.4921406	journal	May 2015
Discovery of stationary operation of quiescent H-mode plasmas with net-zero neutral beam injection torque and high energy confinement on DIII-D Burrell, K. H.; Barada, K.; Chen, X. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4943521	journal	March 2016
Improved edge charge exchange recombination spectroscopy in DIII-D Chrystal, C.; Burrell, K. H.; Grierson, B. A. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4958915	journal	August 2016
Active spectroscopy measurements of the deuterium temperature, rotation, and density from the core to scrape off layer on the DIII-D tokamak (invited) Haskey, S. R.; Grierson, B. A.; Stagner, L. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038349	journal	October 2018
Long-lived predator-prey dynamics in the pedestal of near-zero torque high performance DIII-D plasmas Barada, K.; Rhodes, T. L.; Burrell, K. H. Physics of Plasmas, Vol. 26, Issue 9 https://doi.org/10.1063/1.5097143	journal	September 2019
Critical error fields for locked mode instability in tokamaks La Haye, R. J.; Fitzpatrick, R.; Hender, T. C. Physics of Fluids B: Plasma Physics, Vol. 4, Issue 7 https://doi.org/10.1063/1.860017	journal	March 1992
Flow shear induced fluctuation suppression in finite aspect ratio shaped tokamak plasma Hahm, T. S.; Burrell, K. H. Physics of Plasmas, Vol. 2, Issue 5 https://doi.org/10.1063/1.871313	journal	May 1995
Chapter 1: Overview and summary Editors, ITER Physics Basis; Co-Chairs, ITER Physics Expert Group Chairs an; Unit, ITER Joint Central Team and Physics Nuclear Fusion, Vol. 39, Issue 12 https://doi.org/10.1088/0029-5515/39/12/301	journal	December 1999
A design retrospective of the DIII-D tokamak Luxon, J. L. Nuclear Fusion, Vol. 42, Issue 5 https://doi.org/10.1088/0029-5515/42/5/313	journal	May 2002
Studies of the ‘Quiescent H-mode’ regime in ASDEX Upgrade and JET Suttrop, W.; Hynönen, V.; Kurki-Suonio, T. Nuclear Fusion, Vol. 45, Issue 7 https://doi.org/10.1088/0029-5515/45/7/021	journal	July 2005
Energy loss for grassy ELMs and effects of plasma rotation on the ELM characteristics in JT-60U Oyama, N.; Sakamoto, Y.; Isayama, A. Nuclear Fusion, Vol. 45, Issue 8 https://doi.org/10.1088/0029-5515/45/8/014	journal	July 2005
Chapter 4: Power and particle control Loarte, A.; Lipschultz, B.; Kukushkin, A. S. Nuclear Fusion, Vol. 47, Issue 6 https://doi.org/10.1088/0029-5515/47/6/S04	journal	June 2007
Stability and dynamics of the edge pedestal in the low collisionality regime: physics mechanisms for steady-state ELM-free operation Snyder, P. B.; Burrell, K. H.; Wilson, H. R. Nuclear Fusion, Vol. 47, Issue 8 https://doi.org/10.1088/0029-5515/47/8/030	journal	August 2007
Edge pedestal control in quiescent H-mode discharges in DIII-D using co-plus counter-neutral beam injection Burrell, K. H.; Osborne, T. H.; Snyder, P. B. Nuclear Fusion, Vol. 49, Issue 8 https://doi.org/10.1088/0029-5515/49/8/085024	journal	July 2009
A first-principles predictive model of the pedestal height and width: development, testing and ITER optimization with the EPED model Snyder, P. B.; Groebner, R. J.; Hughes, J. W. Nuclear Fusion, Vol. 51, Issue 10 https://doi.org/10.1088/0029-5515/51/10/103016	journal	August 2011
Advances towards QH-mode viability for ELM-stable operation in ITER Garofalo, A. M.; Solomon, W. M.; Park, J. -K. Nuclear Fusion, Vol. 51, Issue 8 https://doi.org/10.1088/0029-5515/51/8/083018	journal	July 2011
Quiescent H-mode operation using torque from non-axisymmetric, non-resonant magnetic fields Burrell, K. H.; Garofalo, A. M.; Solomon, W. M. Nuclear Fusion, Vol. 53, Issue 7 https://doi.org/10.1088/0029-5515/53/7/073038	journal	June 2013
Response of impurity particle confinement time to external actuators in QH-mode plasmas on DIII-D Grierson, B. A.; Burrell, K. H.; Garofalo, A. M. Nuclear Fusion, Vol. 54, Issue 11 https://doi.org/10.1088/0029-5515/54/11/114011	journal	November 2014
The spectral basis of optimal error field correction on DIII-D Paz-Soldan, C.; Buttery, R. J.; Garofalo, A. M. Nuclear Fusion, Vol. 54, Issue 7 https://doi.org/10.1088/0029-5515/54/7/073013	journal	April 2014
The quiescent double barrier regime in the DIII-D tokamak Doyle, E. J.; Baylor, L. R.; Burrell, K. H. Plasma Physics and Controlled Fusion, Vol. 43, Issue 12A https://doi.org/10.1088/0741-3335/43/12A/307	journal	November 2001
ELM-free stationary H-mode plasmas in the ASDEX Upgrade tokamak Suttrop, W.; Maraschek, M.; Conway, G. D. Plasma Physics and Controlled Fusion, Vol. 45, Issue 8 https://doi.org/10.1088/0741-3335/45/8/302	journal	June 2003
Study of quiescent H-mode plasmas in ASDEX Upgrade Suttrop, W.; Conway, G. D.; Fattorini, L. Plasma Physics and Controlled Fusion, Vol. 46, Issue 5A https://doi.org/10.1088/0741-3335/46/5A/016	journal	April 2004
Edge radial electric field structure in quiescent H-mode plasmas in the DIII-D tokamak Burrell, K. H.; West, W. P.; Doyle, E. J. Plasma Physics and Controlled Fusion, Vol. 46, Issue 5A https://doi.org/10.1088/0741-3335/46/5A/018	journal	April 2004
Impact of toroidal rotation on ELM behaviour in the H-mode on JT-60U Sakamoto, Y.; Shirai, H.; Fujita, T. Plasma Physics and Controlled Fusion, Vol. 46, Issue 5A https://doi.org/10.1088/0741-3335/46/5A/033	journal	April 2004
The role of turbulence–flow interactions in L- to H-mode transition dynamics: recent progress Schmitz, L. Nuclear Fusion, Vol. 57, Issue 2 https://doi.org/10.1088/1741-4326/57/2/025003	journal	January 2017
Scaling trends of the critical E × B shear for edge harmonic oscillation onset in DIII-D quiescent H-mode plasmas Wilks, T. M.; Garofalo, A. M.; Diamond, P. H. Nuclear Fusion, Vol. 58, Issue 11 https://doi.org/10.1088/1741-4326/aad143	journal	September 2018
Edge stability of stationary ELM-suppressed regimes on DIII-D Osborne, T. H.; Snyder, P. B.; Burrell, K. H. Journal of Physics: Conference Series, Vol. 123 https://doi.org/10.1088/1742-6596/123/1/012014	journal	July 2008
Quiescent H-Mode Plasmas with Strong Edge Rotation in the Cocurrent Direction Burrell, K. H.; Osborne, T. H.; Snyder, P. B. Physical Review Letters, Vol. 102, Issue 15 https://doi.org/10.1103/PhysRevLett.102.155003	journal	April 2009
Quasistationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E × B Flow During High Performance DIII-D Tokamak Discharges Barada, K.; Rhodes, T. L.; Burrell, K. H. Physical Review Letters, Vol. 120, Issue 13 https://doi.org/10.1103/PhysRevLett.120.135002	journal	March 2018
Quiescent Double Barrier Regime in the DIII-D Tokamak Greenfield, C. M.; Burrell, K. H.; DeBoo, J. C. Physical Review Letters, Vol. 86, Issue 20 https://doi.org/10.1103/PhysRevLett.86.4544	journal	May 2001

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Title: Creation and sustainment of wide pedestal quiescent H-mode with zero net neutral beam torque

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