Intrinsic torque reversals induced by magnetic shear effects on the turbulence spectrum in tokamak plasmas

Lu, Z. X.; Wang, W. X.; Diamond, P. H.; Tynan, G.; Ethier, S.; Gao, C.; Rice, J.

doi:10.1063/1.4919395

Title: Intrinsic torque reversals induced by magnetic shear effects on the turbulence spectrum in tokamak plasmas

Journal Article · Mon May 04 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4919395· OSTI ID:1253129

Lu, Z. X. ^[1]; Wang, W. X. ^[2]; Diamond, P. H. ^[3]; Tynan, G. ^[1]; Ethier, S. ^[2]; Gao, C. ^[4]; Rice, J. ^[5]

Univ. of California, San Diego, CA (United States). Center for Energy Research, Department of Mechanical and Aerospace Engineering, Center for Momentum Transport and Flow Organization, and Center for Astrophysics and Science
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, San Diego, CA (United States). Center for Momentum Transport and Flow Organization and Center for Astrophysics and Space Science
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

We report that intrinsic torque, which can be generated by turbulent stresses, can induce toroidal rotation in a tokamak plasma at rest without direct momentum injection. Reversals in intrinsic torque have been inferred from the observation of toroidal velocity changes in recent lower hybrid current drive (LHCD) experiments. Here we focus on understanding the cause of LHCD-induced intrinsic torque reversal using gyrokinetic simulations and theoretical analyses. A new mechanism for the intrinsic torque reversal linked to magnetic shear (sˆ) effects on the turbulence spectrum is identified. This reversal is a consequence of the ballooning structure at weak sˆ . Based on realistic profiles from the Alcator C-Mod LHCD experiments, simulations demonstrate that the intrinsic torque reverses for weak sˆ discharges and that the value of sˆ _crit is consistent with the experimental results sˆ ^exp_crit [Rice et al., Phys. Rev. Lett. 111, 125003 (2013)]. In conclusion, the consideration of this intrinsic torque feature in our work is important for the understanding of rotation profile generation at weak and its consequent impact on macro-instability stabilization and micro-turbulence reduction, which is crucial for ITER. It is also relevant to internal transport barrier formation at negative or weakly positive sˆ .

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Research Organization:: Univ. of California, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; FG02-OER54871; AC02- 09CH11466

OSTI ID:: 1253129

Alternate ID(s):: OSTI ID: 1228610

Journal Information:: Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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References (37)

The Solar Tachocline Hughes, D. W.; Rosner, R.; Weiss, N. O. https://doi.org/10.1017/CBO9780511536243	book	May 2007
ATMOSPHERES: The Jet-Stream Conundrum Baldwin, M. P.; Rhines, P. B.; Huang, H. -P. Science, Vol. 315, Issue 5811 https://doi.org/10.1126/science.1131375	journal	January 2007
Turbulence: The Legacy of A. N. Kolmogorov Frisch, Uriel https://doi.org/10.1017/CBO9781139170666	book	January 1996
Evidence for a Toroidal-Momentum-Transport Nondiffusive Term from the JFT-2M Tokamak Ida, K.; Miura, Y.; Matsuda, T. Physical Review Letters, Vol. 74, Issue 11 https://doi.org/10.1103/PhysRevLett.74.1990	journal	March 1995
Toroidal rotation and momentum transport in Alcator C-Mod plasmas with no momentum input Rice, J. E.; Lee, W. D.; Marmar, E. S. Physics of Plasmas, Vol. 11, Issue 5 https://doi.org/10.1063/1.1646157	journal	May 2004
An overview of intrinsic torque and momentum transport bifurcations in toroidal plasmas Diamond, P. H.; Kosuga, Y.; Gürcan, Ö. D. Nuclear Fusion, Vol. 53, Issue 10 https://doi.org/10.1088/0029-5515/53/10/104019	journal	September 2013
Stabilization of external modes in tokamaks by resistive walls and plasma rotation Bondeson, A.; Ward, D. J. Physical Review Letters, Vol. 72, Issue 17 https://doi.org/10.1103/PhysRevLett.72.2709	journal	April 1994
Observation of Spontaneous Toroidal Rotation Inversion in Ohmically Heated Tokamak Plasmas Bortolon, A.; Duval, B. P.; Pochelon, A. Physical Review Letters, Vol. 97, Issue 23 https://doi.org/10.1103/PhysRevLett.97.235003	journal	December 2006
Rotation Reversal Bifurcation and Energy Confinement Saturation in Tokamak Ohmic $L$ -Mode Plasmas Rice, J. E.; Cziegler, I.; Diamond, P. H. Physical Review Letters, Vol. 107, Issue 26 https://doi.org/10.1103/PhysRevLett.107.265001	journal	December 2011
Observation of Self-Generated Flows in Tokamak Plasmas with Lower-Hybrid-Driven Current Ince-Cushman, A.; Rice, J. E.; Reinke, M. Physical Review Letters, Vol. 102, Issue 3 https://doi.org/10.1103/PhysRevLett.102.035002	journal	January 2009
Observation of Cocurrent Toroidal Rotation in the EAST Tokamak with Lower-Hybrid Current Drive Shi, Yuejiang; Xu, Guosheng; Wang, Fudi Physical Review Letters, Vol. 106, Issue 23 https://doi.org/10.1103/PhysRevLett.106.235001	journal	June 2011
Effects of Magnetic Shear on Toroidal Rotation in Tokamak Plasmas with Lower Hybrid Current Drive Rice, J. E.; Podpaly, Y. A.; Reinke, M. L. Physical Review Letters, Vol. 111, Issue 12 https://doi.org/10.1103/PhysRevLett.111.125003	journal	September 2013
Effect of q -profile modification by LHCD on internal transport barriers in JET ^* Challis, C. D.; Baranov, Yu F.; Conway, G. D. Plasma Physics and Controlled Fusion, Vol. 43, Issue 7 https://doi.org/10.1088/0741-3335/43/7/303	journal	May 2001
A review of internal transport barrier physics for steady-state operation of tokamaks Connor, J. W.; Fukuda, T.; Garbet, X. Nuclear Fusion, Vol. 44, Issue 4 https://doi.org/10.1088/0029-5515/44/4/R01	journal	March 2004
ITB formation in terms of ω _E×B flow shear and magnetic shear s on JET Tala, T. J. J.; Heikkinen, J. A.; Parail, V. V. Plasma Physics and Controlled Fusion, Vol. 43, Issue 4 https://doi.org/10.1088/0741-3335/43/4/309	journal	March 2001
Role of radial electric field and plasma rotation in the time evolution of internal transport barrier in JT-60U Shirai, H.; Kikuchi, M.; Takizuka, T. Plasma Physics and Controlled Fusion, Vol. 42, Issue 5A https://doi.org/10.1088/0741-3335/42/5A/310	journal	May 2000
Residual parallel Reynolds stress due to turbulence intensity gradient in tokamak plasmas Gürcan, Ö. D.; Diamond, P. H.; Hennequin, P. Physics of Plasmas, Vol. 17, Issue 11 https://doi.org/10.1063/1.3503624	journal	November 2010
Analysis of symmetry breaking mechanisms and the role of turbulence self-regulation in intrinsic rotation Kwon, J. M.; Yi, S.; Rhee, T. Nuclear Fusion, Vol. 52, Issue 1 https://doi.org/10.1088/0029-5515/52/1/013004	journal	November 2011
Gyrokinetic Studies on Turbulence-Driven and Neoclassical Nondiffusive Toroidal-Momentum Transport and the Effect of Residual Fluctuations in Strong $E \times B$ Shear Wang, W. X.; Hahm, T. S.; Ethier, S. Physical Review Letters, Vol. 102, Issue 3 https://doi.org/10.1103/PhysRevLett.102.035005	journal	January 2009
Nonlinear flow generation by electrostatic turbulence in tokamaks Wang, W. X.; Diamond, P. H.; Hahm, T. S. Physics of Plasmas, Vol. 17, Issue 7 https://doi.org/10.1063/1.3459096	journal	July 2010
Trapped Electron Mode Turbulence Driven Intrinsic Rotation in Tokamak Plasmas Wang, W. X.; Hahm, T. S.; Ethier, S. Physical Review Letters, Vol. 106, Issue 8 https://doi.org/10.1103/PhysRevLett.106.085001	journal	February 2011
Theory of perturbed equilibria for solving the Grad–Shafranov equation Zakharov, L. E.; Pletzer, A. Physics of Plasmas, Vol. 6, Issue 12 https://doi.org/10.1063/1.873756	journal	December 1999
Numerical simulation of ion‐temperature‐gradient‐driven modes Xu, X. Q.; Rosenbluth, M. N. Physics of Fluids B: Plasma Physics, Vol. 3, Issue 3 https://doi.org/10.1063/1.859862	journal	March 1991
Theory of plasma transport in toroidal confinement systems Hinton, F. L.; Hazeltine, R. D. Reviews of Modern Physics, Vol. 48, Issue 2 https://doi.org/10.1103/RevModPhys.48.239	journal	April 1976
Multi-channel transport experiments at Alcator C-Mod and comparison with gyrokinetic simulations White, A. E.; Howard, N. T.; Greenwald, M. Physics of Plasmas, Vol. 20, Issue 5 https://doi.org/10.1063/1.4803089	journal	May 2013
Reduction of Turbulent Transport with Zonal Flows Enhanced in Helical Systems Watanabe, T. -H.; Sugama, H.; Ferrando-Margalet, S. Physical Review Letters, Vol. 100, Issue 19 https://doi.org/10.1103/PhysRevLett.100.195002	journal	May 2008
Intrinsic rotation and electric field shear Gürcan, Ö. D.; Diamond, P. H.; Hahm, T. S. Physics of Plasmas, Vol. 14, Issue 4 https://doi.org/10.1063/1.2717891	journal	April 2007
n-dependence of ballooning instabilities Dewar, R. L.; Manickam, J.; Grimm, R. C. Nuclear Fusion, Vol. 21, Issue 4 https://doi.org/10.1088/0029-5515/21/4/008	journal	April 1981
Theoretical and numerical studies of wave-packet propagation in tokamak plasmas Lu, Z. X.; Zonca, F.; Cardinali, A. Physics of Plasmas, Vol. 19, Issue 4 https://doi.org/10.1063/1.3698626	journal	April 2012
Microinstability theory in tokamaks Tang, W. M. Nuclear Fusion, Vol. 18, Issue 8 https://doi.org/10.1088/0029-5515/18/8/006	journal	August 1978
Drift-wave eigenmodes in toroidal plasmas Chen, Liu; Cheng, C. Z. Physics of Fluids, Vol. 23, Issue 11 https://doi.org/10.1063/1.862907	journal	January 1980
Bulk plasma rotation in the TCV tokamak in the absence of external momentum input Duval, B. P.; Bortolon, A.; Karpushov, A. Plasma Physics and Controlled Fusion, Vol. 49, Issue 12B https://doi.org/10.1088/0741-3335/49/12B/S18	journal	November 2007
Intrinsic Toroidal Rotation, Density Peaking, and Turbulence Regimes in the Core of Tokamak Plasmas Angioni, C.; McDermott, R. M.; Casson, F. J. Physical Review Letters, Vol. 107, Issue 21 https://doi.org/10.1103/PhysRevLett.107.215003	journal	November 2011
Advanced scenarios for ITER operation Sips, A. C. C.; Operation, for the Steady State; Activity, the Transport Physics topical group Plasma Physics and Controlled Fusion, Vol. 47, Issue 5A https://doi.org/10.1088/0741-3335/47/5A/003	journal	April 2005
Turbulent acceleration and heating in toroidal magnetized plasmas Garbet, X.; Esteve, D.; Sarazin, Y. Physics of Plasmas, Vol. 20, Issue 7 https://doi.org/10.1063/1.4816021	journal	July 2013
Gyrokinetic Theory of Turbulent Acceleration of Parallel Rotation in Tokamak Plasmas Wang, Lu; Diamond, P. H. Physical Review Letters, Vol. 110, Issue 26 https://doi.org/10.1103/PhysRevLett.110.265006	journal	June 2013
Toroidal Rotation Driven by the Polarization Drift McDevitt, C. J.; Diamond, P. H.; Gürcan, Ö. D. Physical Review Letters, Vol. 103, Issue 20 https://doi.org/10.1103/PhysRevLett.103.205003	journal	November 2009

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Mode structure symmetry breaking of energetic particle driven beta-induced Alfvén eigenmode Lu, Z. X.; Wang, X.; Lauber, Ph. Physics of Plasmas, Vol. 25, Issue 1 https://doi.org/10.1063/1.5006678	journal	January 2018
Effects of the q profile on toroidal rotation in Alcator C-Mod LHCD plasmas Rice, J. E.; Gao, C.; Mumgaard, R. Nuclear Fusion, Vol. 56, Issue 3 https://doi.org/10.1088/0029-5515/56/3/036015	journal	February 2016
The effect of lower hybrid waves on JET plasma rotation Nave, M. F. F.; Kirov, K.; Bernardo, J. Nuclear Fusion, Vol. 57, Issue 3 https://doi.org/10.1088/1741-4326/aa4e54	journal	December 2016
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Title: Intrinsic torque reversals induced by magnetic shear effects on the turbulence spectrum in tokamak plasmas

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