Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D
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 t...
| Main Authors: | , , , , , , |
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| Format: | Article |
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IOP Publishing
2018
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| Online Access: | http://hdl.handle.net/1721.1/113073 https://orcid.org/0000-0002-1620-9680 https://orcid.org/0000-0003-4432-5504 |
| _version_ | 1826207351807410176 |
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| author | Yang, C Ding, B J Li, M H Shiraiwa, Shunichi Bonoli, Paul T. Wright, John C. Parker, R. |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Yang, C Ding, B J Li, M H Shiraiwa, Shunichi Bonoli, Paul T. Wright, John C. Parker, R. |
| author_sort | Yang, C |
| collection | MIT |
| description | 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. 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. |
| first_indexed | 2024-09-23T13:47:59Z |
| format | Article |
| id | mit-1721.1/113073 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T13:47:59Z |
| publishDate | 2018 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1130732023-02-26T03:37:50Z Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D Yang, C Ding, B J Li, M H Shiraiwa, Shunichi Bonoli, Paul T. Wright, John C. Parker, R. Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Plasma Science and Fusion Center Bonoli, Paul T Wright, John C Parker, Ronald R Shiraiwa, Shunichi 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. 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. United States. Department of Energy (Contract DE-FC02-01ER54648-Sci-DAC) United States. Department of Energy (Contract DE-FC02-99ER54512) 2018-01-11T21:10:00Z 2018-01-11T21:10:00Z 2014-10 2014-09 2018-01-11T16:07:03Z Article http://purl.org/eprint/type/JournalArticle 0741-3335 1361-6587 http://hdl.handle.net/1721.1/113073 Yang, C et al. “Modelling of the EAST Lower-Hybrid Current Drive Experiment Using GENRAY/CQL3D and TORLH/CQL3D.” Plasma Physics and Controlled Fusion 56, 12 (October 2014): 125003 © 2014 IOP Publishing Ltd https://orcid.org/0000-0002-1620-9680 https://orcid.org/0000-0003-4432-5504 http://dx.doi.org/10.1088/0741-3335/56/12/125003 Plasma Physics and Controlled Fusion Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing MIT Plasma Science & Fusion Center |
| spellingShingle | Yang, C Ding, B J Li, M H Shiraiwa, Shunichi Bonoli, Paul T. Wright, John C. Parker, R. Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D |
| title | Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D |
| title_full | Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D |
| title_fullStr | Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D |
| title_full_unstemmed | Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D |
| title_short | Modelling of the EAST lower-hybrid current drive experiment using GENRAY/CQL3D and TORLH/CQL3D |
| title_sort | modelling of the east lower hybrid current drive experiment using genray cql3d and torlh cql3d |
| url | http://hdl.handle.net/1721.1/113073 https://orcid.org/0000-0002-1620-9680 https://orcid.org/0000-0003-4432-5504 |
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