Observation of synergy between lower hybrid waves at two frequencies in EAST

Choi, W. ; Poli, F. M. ; Li, M. H. ; Baek, S. G. ; Gorelenkova, 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.
Issue date: 2021
Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Choi, W., Poli, F. M., Li, M. H., Baek, S. G., Gorelenkova, 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. (2021). Observation of synergy between lower hybrid waves at two frequencies in EAST [Data set]. Princeton Plasma Physics Laboratory, Princeton University. https://doi.org/10.11578/1814956
  author      = {Choi, W. and
                Poli, F. M. and
                Li, M. H. and
                Baek, S. G. and
                Gorelenkova, 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.},
  title       = {{Observation of synergy between lower hyb
                rid waves at two frequencies in EAST}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2021,
  url         = {https://doi.org/10.11578/1814956}

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 (n_e,lin ≈ 2.0 × 10^19m^−3), simultaneous injection of a 65/35 mix of 2.45 GHz/4.6 GHz power achieved an LHCD 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-ray 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.

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1 LHsynergyDMP.h5 3.58 MB
2 LHsynergyDMP.txt 1.97 KB
3 license.txt 3.22 KB