Observation of synergy between lower hybrid waves at two frequencies in EAST
Abstract
Synergistic effects between two frequencies of lower hybrid (LH) waves—operating at 2.45 and 4.6 GHz—were observed in experiment on EAST for the first time. At low density (ne,lin≈2.0×1019 m−3), simultaneous injection of a 65/35 mix of 2.45/4.6 GHz power achieved an lower hybrid current drive efficiency that was 25% higher than what should be expected from the linear combination of the two sources. The experiment was interpreted with time-dependent simulations, using the equilibrium and transport solver TRANSP, coupled with the ray-tracing code GENRAY and the Fokker–Planck solver CQL3D. For each discharge, profiles of current and hard x-rays from simulation and measurement agree within uncertainties. An examination of the electron distribution function indicates that the LH synergy is supported by the increased width of the LH resonance plateau in the simultaneous injection case compared to independent injection.
- Publication Date:
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1807620
- Grant/Contract Number:
- AC02-09CH1146; SC0010685
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Name: Physics of Plasmas Journal Volume: 28 Journal Issue: 7; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Choi, W., Poli, F. M., Li, M. H., Baek, S. G., Gorenlenkova, M., Ding, B. J., Gong, X. Z., Chan, A., Duan, Y. M., Hu, J. H., Lian, H., Lin, S. Y., Liu, H. Q., Qian, J. P., Wallace, G., Wang, Y. M., Zang, Q., and Zhao, H. L. Observation of synergy between lower hybrid waves at two frequencies in EAST. United States: N. p., 2021.
Web. doi:10.1063/5.0041271.
Choi, W., Poli, F. M., Li, M. H., Baek, S. G., Gorenlenkova, M., Ding, B. J., Gong, X. Z., Chan, A., Duan, Y. M., Hu, J. H., Lian, H., Lin, S. Y., Liu, H. Q., Qian, J. P., Wallace, G., Wang, Y. M., Zang, Q., & Zhao, H. L. Observation of synergy between lower hybrid waves at two frequencies in EAST. United States. https://doi.org/10.1063/5.0041271
Choi, W., Poli, F. M., Li, M. H., Baek, S. G., Gorenlenkova, M., Ding, B. J., Gong, X. Z., Chan, A., Duan, Y. M., Hu, J. H., Lian, H., Lin, S. Y., Liu, H. Q., Qian, J. P., Wallace, G., Wang, Y. M., Zang, Q., and Zhao, H. L. Mon .
"Observation of synergy between lower hybrid waves at two frequencies in EAST". United States. https://doi.org/10.1063/5.0041271.
@article{osti_1807620,
title = {Observation of synergy between lower hybrid waves at two frequencies in EAST},
author = {Choi, W. and Poli, F. M. and Li, M. H. and Baek, S. G. and Gorenlenkova, M. and Ding, B. J. and Gong, X. Z. and Chan, A. and Duan, Y. M. and Hu, J. H. and Lian, H. and Lin, S. Y. and Liu, H. Q. and Qian, J. P. and Wallace, G. and Wang, Y. M. and Zang, Q. and Zhao, H. L.},
abstractNote = {Synergistic effects between two frequencies of lower hybrid (LH) waves—operating at 2.45 and 4.6 GHz—were observed in experiment on EAST for the first time. At low density (ne,lin≈2.0×1019 m−3), simultaneous injection of a 65/35 mix of 2.45/4.6 GHz power achieved an lower hybrid current drive efficiency that was 25% higher than what should be expected from the linear combination of the two sources. The experiment was interpreted with time-dependent simulations, using the equilibrium and transport solver TRANSP, coupled with the ray-tracing code GENRAY and the Fokker–Planck solver CQL3D. For each discharge, profiles of current and hard x-rays from simulation and measurement agree within uncertainties. An examination of the electron distribution function indicates that the LH synergy is supported by the increased width of the LH resonance plateau in the simultaneous injection case compared to independent injection.},
doi = {10.1063/5.0041271},
journal = {Physics of Plasmas},
number = 7,
volume = 28,
place = {United States},
year = {Mon Jul 12 00:00:00 EDT 2021},
month = {Mon Jul 12 00:00:00 EDT 2021}
}
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