Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D

Yang, C.; Bonoli, P. T.; Wright, J. C.; Ding, B. J.; Parker, R.; Shiraiwa, S.; Li, M. H.

doi:10.1088/0741-3335/56/12/125003

Title: Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D

Journal Article · Tue Oct 14 00:00:00 EDT 2014 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/56/12/125003· OSTI ID:1557616

Yang, C. ^[1]; Bonoli, P. T. ^[2]; Wright, J. C. ^[2]; Ding, B. J. ^[1]; Parker, R. ^[2]; Shiraiwa, S. ^[1]; Li, M. H. ^[1]

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

The coupled GENRAY-CQL3D code has been used to do systematic ray-tracing and Fokker–Planck analysis for EAST Lower Hybrid wave Current Drive (LHCD) experiments. Despite being in the weak absorption regime, the experimental level of LH current drive is successfully simulated, by taking into account the variations in the parallel wavenumber due to the toroidal effect. The effect of radial transport of the fast LH electrons in EAST has also been studied, which shows that a modest amount of radial transport diffusion can redistribute the fast LH current significantly. Taking advantage of the new capability in GENRAY, the actual Scrape Off Layer (SOL) model with magnetic field, density, temperature, and geometry is included in the simulation for both the lower and the higher density cases, so that the collisional losses of Lower Hybrid Wave (LHW) power in the SOL has been accounted for, which together with fast electron losses can reproduce the LHCD experimental observations in different discharges of EAST. We have also analyzed EAST discharges where there is a significant ohmic contribution to the total current, and good agreement with experiment in terms of total current has been obtained. Also, the full-wave code TORLH has been used for the simulation of the LH physics in the EAST, including full-wave effects such as diffraction and focusing which may also play an important role in bridging the spectral gap. The comparisons between the GENRAY and the TORLH codes are done for both the Maxwellian and the quasi-linear electron Landau damping cases. In conclusion, these simulations represent an important addition to the validation studies of the GENRAY-CQL3D and TORLH models being used in weak absorption scenarios of tokamaks with large aspect ratio.

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

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

Grant/Contract Number:: FC02-99ER54512

OSTI ID:: 1557616

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 56, Issue 12; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Numerical studies of electron cyclotron wave current drive on HL-2A tokamak Li, J. C.; Gong, X. Y.; Dong, J. Q. Physics of Plasmas, Vol. 22, Issue 6 https://doi.org/10.1063/1.4923303	journal	June 2015
Modeling of the control of the driven current profile in ICRF MCCD on EAST plasma Yin, L.; Yang, C.; Gong, X. Y. AIP Advances, Vol. 8, Issue 5 https://doi.org/10.1063/1.5018661	journal	May 2018
Studies of various physics effects on an on-axis LHCD experiment using numerical tools Yang, C.; Bonoli, P. T.; Shiraiwa, S. Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5041018	journal	August 2018
Synergy of two lower hybrid waves with different frequencies on EAST Zhai, X. M.; Chen, J. L.; Xiang, N. Physics of Plasmas, Vol. 26, Issue 5 https://doi.org/10.1063/1.5095653	journal	May 2019
Investigations of LHW-plasma coupling and current drive at high density related to H-mode experiments in EAST Ding, B. J.; Li, Y. C.; Zhang, L. Nuclear Fusion, Vol. 55, Issue 9 https://doi.org/10.1088/0029-5515/55/9/093030	journal	August 2015

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