Observation and analysis of lower-hybrid-current-drive density limit in EAST

Li, M. H.; Baek, S. G.; Wallace, G. M.; Ding, B. J.; Wu, C. B.; Yan, G. H.; Bonoli, P. T.; Wang, M.; Liu, L.; Zhao, L. M.; Wu, Z. G.; Yang, H.; Lin, S. Y.; Zang, Q.; Yan, N.; Zhao, H. L.; Huang, J.; Zhai, X. M.; Li, X. X.; Zhang, X. J.; Gong, X. Z.

doi:10.1088/1741-4326/ac99ed

Observation and analysis of lower-hybrid-current-drive density limit in EAST

Journal Article · Sun Nov 06 23:00:00 EST 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac99ed· OSTI ID:2420040

^[1]; Baek, S. G. ^[2]; ^[2]; ^[3]; Wu, C. B. ^[3]; ^[3]; Bonoli, P. T. ^[2]; Wang, M. ^[3]; Liu, L. ^[3]; Zhao, L. M. ^[3]; Wu, Z. G. ^[3]; ^[3]; Lin, S. Y. ^[3]; Zang, Q. ^[3]; ^[3]; Zhao, H. L. ^[3]; Huang, J. ^[3]; ^[3]; ^[4]; Zhang, X. J. ^[3] more »

Chinese Academy of Sciences (CAS) (China); OSTI
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Chinese Academy of Sciences (CAS) (China)
University of South China (China)

Lower hybrid current drive (LHCD) experiments with line-averaged density up to ~5.1 × 10¹⁹ m^–3 were performed in EAST L-mode plasmas. When the line-averaged density rises above a critical value, the hard x-ray (HXR) emission falls to the noise level, indicating that the LHCD density limit is encountered. The experimental results show that the LHCD density limit can be increased with higher wave source frequency (ƒ₀) and higher magnetic field (B_t). Although a higher LHCD density limit is obtained by a higher magnetic field for both 2.45 GHz and 4.6 GHz waves, the results show a stronger dependence on the magnetic field for the 4.6 GHz case. Analysis suggests that, for normal operation with a relatively low magnetic field (1.6 T $$\leqslant$$ B_t $$\leqslant$$ 2.5 T) on EAST, the dominant mechanisms responsible for the LHCD density limit are different between the 2.45 GHz and 4.6 GHz waves. The wave accessibility plays a more significant role during 4.6 GHz LHCD experiments, while parasitic losses due to parametric decay instability (PDIs) dominate the accessibility issue in the 2.45 GHz case. Collisional loss in the scrape-off layer (SOL) may explain the 4.6 GHz result when combined with the accessibility limit at high density and low temperature.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010492

OSTI ID:: 2420040

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 12 Vol. 62; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (50)

Lower Hybrid Current Drive in High Aspect Ratio Tokamaks Peysson, Y.; Mazon, D. Journal of Fusion Energy, Vol. 39, Issue 5 https://doi.org/10.1007/s10894-020-00266-1	journal	October 2020
Parametric instabilities in a magnetized plasma Liu, C. S.; Tripathi, V. K. Physics Reports, Vol. 130, Issue 3 https://doi.org/10.1016/0370-1573(86)90108-0	journal	January 1986
Toward a LHCD system for ITER Bibet, Ph.; Beaumont, B.; Belo, J. H. Fusion Engineering and Design, Vol. 74, Issue 1-4 https://doi.org/10.1016/j.fusengdes.2005.06.014	journal	November 2005
Nuclear-thermal-coupled optimization code for the fusion breeding blanket conceptual design Li, Jia; Jiang, Kecheng; Zhang, Xiaokang Fusion Engineering and Design, Vol. 113 https://doi.org/10.1016/j.fusengdes.2016.10.004	journal	December 2016
Impact of lithium wall conditioning and wave-frequency on high density lower hybrid current drive experiment on EAST Baek, S. G.; Li, M. H.; Wallace, G. M. Nuclear Materials and Energy, Vol. 26 https://doi.org/10.1016/j.nme.2021.100955	journal	March 2021
Current drive at plasma densities required for thermonuclear reactors Cesario, R.; Amicucci, L.; Cardinali, A. Nature Communications, Vol. 1, Issue 1 https://doi.org/10.1038/ncomms1052	journal	August 2010
Absorption of lower hybrid waves in the scrape off layer of a diverted tokamak Wallace, G. M.; Parker, R. R.; Bonoli, P. T. Physics of Plasmas, Vol. 17, Issue 8 https://doi.org/10.1063/1.3465662	journal	August 2010
Characterization of the onset of ion cyclotron parametric decay instability of lower hybrid waves in a diverted tokamak Baek, S. G.; Parker, R. R.; Shiraiwa, S. Physics of Plasmas, Vol. 21, Issue 6 https://doi.org/10.1063/1.4884355	journal	June 2014
Parametric instabilities due to lower-hybrid radio frequency heating of tokamak plasmas Porkolab, Miklos Physics of Fluids, Vol. 20, Issue 12 https://doi.org/10.1063/1.861825	journal	January 1977
Observation of parametric instabilities in the lower-hybrid range of frequencies in the high-density tokamak Takase, Y.; Porkolab, M.; Schuss, J. J. Physics of Fluids, Vol. 28, Issue 3 https://doi.org/10.1063/1.865070	journal	January 1985
Simulation model for lower hybrid current drive Bonoli, Paul T.; Englade, Ronald C. Physics of Fluids, Vol. 29, Issue 9 https://doi.org/10.1063/1.865494	journal	September 1986
Comparative modeling of lower hybrid wave coupling with 2.45 GHz and 4.6 GHz launchers on EAST Li, M. H.; Ding, B. J.; Liu, L. AIP Conference Proceedings https://doi.org/10.1063/5.0013590	conference	January 2020
Slow-wave launching at the lower hybrid frequency using a phased waveguide array Brambilla, M. Nuclear Fusion, Vol. 16, Issue 1 https://doi.org/10.1088/0029-5515/16/1/005	journal	February 1976
Lower hybrid current drive efficiency in the JT-60 tokamak Ushigusa, K.; Imai, T.; Ikeda, Y. Nuclear Fusion, Vol. 29, Issue 6 https://doi.org/10.1088/0029-5515/29/6/015	journal	June 1989
Ultra-long pulse operation using lower hybrid waves on the superconducting high field tokamak TRIAM-1M Moriyama, S.; Nakamura, Y.; Nagao, A. Nuclear Fusion, Vol. 30, Issue 1 https://doi.org/10.1088/0029-5515/30/1/005	journal	January 1990
Density fluctuations and spectral broadening during the lower hybrid current drive experiment on ASDEX Cesario, R.; Bartiromo, R.; Cardinali, A. Nuclear Fusion, Vol. 32, Issue 12 https://doi.org/10.1088/0029-5515/32/12/i04	journal	December 1992
Effects of the spectral broadening of lower hybrid waves on current drive efficiency in the ASDEX tokamak Pericoli-Ridolfini, V.; Bartiromo, R.; Tuccillo, A. A. Nuclear Fusion, Vol. 32, Issue 2 https://doi.org/10.1088/0029-5515/32/2/i10	journal	February 1992
Frequency spectral broadening of lower hybrid waves in tokamak plasmas-causes and effects Pericoli-Ridolfini, V.; Giannone, L.; Bartiromo, R. Nuclear Fusion, Vol. 34, Issue 4 https://doi.org/10.1088/0029-5515/34/4/i01	journal	April 1994
Wave accessibility effects on lower hybrid current drive in JT-60U Ikeda, Y.; Naito, O.; Ushigusa, K. Nuclear Fusion, Vol. 34, Issue 6 https://doi.org/10.1088/0029-5515/34/6/i10	journal	June 1994
Profile control experiments in JET using off-axis lower hybrid current drive Ekedahl, A.; Baranov, Yu. F.; Dobbing, J. A. Nuclear Fusion, Vol. 38, Issue 9 https://doi.org/10.1088/0029-5515/38/9/314	journal	September 1998
Current profile control and improvement of current drive efficiency by combined lower hybrid waves in TRIAM-1M Sakamoto, M.; Itoh, S.; Sato, K. N. Nuclear Fusion, Vol. 40, Issue 3Y https://doi.org/10.1088/0029-5515/40/3y/303	journal	March 2000
Recent fully non-inductive operation results in Tore Supra with 6 min, 1 GJ plasma discharges Houtte, D. van; Martin, G.; Bécoulet, A. Nuclear Fusion, Vol. 44, Issue 5 https://doi.org/10.1088/0029-5515/44/5/l01	journal	May 2004
Study of lower hybrid current drive efficiency over a wide range of FTU plasma parameters Ridolfini, V. Pericoli; Calabrò, G.; Panaccione, L. Nuclear Fusion, Vol. 45, Issue 11 https://doi.org/10.1088/0029-5515/45/11/020	journal	October 2005
A lower hybrid current drive system for ITER Hoang, G. T.; Bécoulet, A.; Jacquinot, J. Nuclear Fusion, Vol. 49, Issue 7 https://doi.org/10.1088/0029-5515/49/7/075001	journal	May 2009
The role of non-resonant collision dissipation in lower hybrid current driven plasmas Barbato, E. Nuclear Fusion, Vol. 51, Issue 10 https://doi.org/10.1088/0029-5515/51/10/103032	journal	September 2011
Calculations of lower hybrid current drive in ITER Decker, J.; Peysson, Y.; Hillairet, J. Nuclear Fusion, Vol. 51, Issue 7 https://doi.org/10.1088/0029-5515/51/7/073025	journal	June 2011
Lower hybrid current drive at high density on Tore Supra Goniche, M.; Basiuk, V.; Decker, J. Nuclear Fusion, Vol. 53, Issue 3 https://doi.org/10.1088/0029-5515/53/3/033010	journal	February 2013
Steady state plasma performance on JT-60U Naito, O. Plasma Physics and Controlled Fusion, Vol. 35, Issue SB https://doi.org/10.1088/0741-3335/35/sb/017	journal	December 1993
Functional dependence of the lower hybrid power absorption coefficient in JET Pericoli-Ridolfini, V.; Ekedahl, A.; Baranov, Y. Plasma Physics and Controlled Fusion, Vol. 39, Issue 7 https://doi.org/10.1088/0741-3335/39/7/006	journal	July 1997
Lower hybrid current drive for the steady-state scenario Goniche, M.; Amicucci, L.; Baranov, Y. Plasma Physics and Controlled Fusion, Vol. 52, Issue 12 https://doi.org/10.1088/0741-3335/52/12/124031	journal	November 2010
Plasma edge density and lower hybrid current drive in JET (Joint European Torus) Cesario, R.; Amicucci, L.; Castaldo, C. Plasma Physics and Controlled Fusion, Vol. 53, Issue 8 https://doi.org/10.1088/0741-3335/53/8/085011	journal	June 2011
Measurements of ion cyclotron parametric decay of lower hybrid waves at the high-field side of Alcator C-Mod Baek, S. G.; Parker, R. R.; Shiraiwa, S. Plasma Physics and Controlled Fusion, Vol. 55, Issue 5 https://doi.org/10.1088/0741-3335/55/5/052001	journal	April 2013
Advances in modeling of lower hybrid current drive Peysson, Y.; Decker, J.; Nilsson, E. Plasma Physics and Controlled Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/0741-3335/58/4/044008	journal	February 2016
Experimental investigation on spectral broadening of lower hybrid waves with different frequencies in the EAST long-pulse plasmas Li, M. H.; Ding, B. J.; Liu, F. K. Plasma Physics and Controlled Fusion, Vol. 61, Issue 6 https://doi.org/10.1088/1361-6587/aaf9da	journal	April 2019
Evolution of electron current layer during anti-parallel magnetic reconnection Huang, Can; Du, Aimin; Ge, Yasong S. Plasma Physics and Controlled Fusion, Vol. 62, Issue 5 https://doi.org/10.1088/1361-6587/ab7d49	journal	April 2020
Review of recent experimental and modeling advances in the understanding of lower hybrid current drive in ITER-relevant regimes Ding, B. J.; Bonoli, P. T.; Tuccillo, A. Nuclear Fusion, Vol. 58, Issue 9 https://doi.org/10.1088/1741-4326/aad0aa	journal	July 2018
Correlation between the onset of parametric instability of lower hybrid waves and modification in edge plasma current profile on EAST Ding, B. J.; Li, M. H.; Li, Y. C. Nuclear Fusion, Vol. 58, Issue 12 https://doi.org/10.1088/1741-4326/aae027	journal	September 2018
Integrated operation of steady-state long-pulse H-mode in Experimental Advanced Superconducting Tokamak Gong, X.; Garofalo, A. M.; Huang, J. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab1c7b	journal	July 2019
Scoping study of lower hybrid current drive for CFETR Wallace, G. M.; Ding, B. J.; Li, M. H. Nuclear Fusion, Vol. 61, Issue 10 https://doi.org/10.1088/1741-4326/ac1ae1	journal	September 2021
Validation of theory-based integrated modeling and new insights for a high-performance steady-state scenario with only RF heating on EAST Zhai, X. M.; Chen, J. L.; Xiang, N. Nuclear Fusion, Vol. 62, Issue 7 https://doi.org/10.1088/1741-4326/ac555e	journal	April 2022
Observation of Efficient Lower Hybrid Current Drive at High Density in Diverted Plasmas on the Alcator C-Mod Tokamak Baek, S. G.; Wallace, G. M.; Bonoli, P. T. Physical Review Letters, Vol. 121, Issue 5 https://doi.org/10.1103/PhysRevLett.121.055001	journal	August 2018
Observation of Parametric Decay by Use of C O 2 Laser Scattering from a Plasma Takase, Y.; Watterson, R. L.; Porkolab, M. Physical Review Letters, Vol. 53, Issue 3 https://doi.org/10.1103/PhysRevLett.53.274	journal	July 1984
Observation of Lower-Hybrid Current Drive at High Densities in the Alcator C Tokamak Porkolab, M.; Schuss, J. J.; Lloyd, B. Physical Review Letters, Vol. 53, Issue 5 https://doi.org/10.1103/PhysRevLett.53.450	journal	July 1984
High Plasma Density Lower-Hybrid Current Drive in the FTU Tokamak Pericoli-Ridolfini, V.; Barbato, E.; Cirant, S. Physical Review Letters, Vol. 82, Issue 1 https://doi.org/10.1103/PhysRevLett.82.93	journal	January 1999
Observation of Parametric Instabilities in Lower-Hybrid Radio-Frequency Heating of Tokamaks Porkolab, M.; Bernabei, S.; Hooke, W. M. Physical Review Letters, Vol. 38, Issue 5 https://doi.org/10.1103/physrevlett.38.230	journal	January 1977
Experimental Observation of the rf-Driven Current by the Lower-Hybrid Wave in a Tokamak Yamamoto, T.; Imai, T.; Shimada, M. Physical Review Letters, Vol. 45, Issue 9 https://doi.org/10.1103/physrevlett.45.716	journal	September 1980
Generation of rf-Driven Currents by Lower-Hybrid-Wave Injection in the Versator II Tokamak Luckhardt, S. C.; Porkolab, M.; Knowlton, S. F. Physical Review Letters, Vol. 48, Issue 3 https://doi.org/10.1103/physrevlett.48.152	journal	January 1982
Lower-Hybrid Current Drive in the PLT Tokamak Bernabei, S.; Daughney, C.; Efthimion, P. Physical Review Letters, Vol. 49, Issue 17 https://doi.org/10.1103/physrevlett.49.1255	journal	October 1982
Frequency Scaling of the Lower-Hybrid-Current-Drive Density Limit in Tokamak Plasmas Mayberry, M. J.; Porkolab, M.; Chen, K. -I. Physical Review Letters, Vol. 55, Issue 8 https://doi.org/10.1103/physrevlett.55.829	journal	August 1985
Theory of current drive in plasmas Fisch, Nathaniel J. Reviews of Modern Physics, Vol. 59, Issue 1 https://doi.org/10.1103/revmodphys.59.175	journal	January 1987

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