التفاصيل البيبلوغرافية
| العنوان: |
Synergy of two lower hybrid waves with different frequencies on EAST |
| المؤلفون: |
Zhai, X.M., Chen, J.L., Xiang, N., Bonoli, P.T., Shiraiwa, S. |
| بيانات النشر: |
Harvard Dataverse |
| سنة النشر: |
2023 |
| المجموعة: |
Harvard Dataverse Network |
| مصطلحات موضوعية: |
Physics, EAST launching waves, electron distribution functions, flux surfaces, frequency 2.45 GHz, frequency 4.6 GHz, injected wave power, Landau damping, long pulse discharges, low density plasmas, lower hybrid current drive, Lower Hybrid waves, magnetic shear reversal configuration, phase space analysis, ray-tracing Fokker-Planck simulations, wave propagation domains |
| الوصف: |
Lower hybrid current drive (LHCD) is one of the major approaches maintaining long pulse discharges on EAST. There are two lower hybrid (LH) systems on EAST launching waves at 4.6 GHz and 2.45 GHz into the plasma, respectively, and the input power of the 4.6 GHz wave is typically dominant. In this work, the synergy of the two waves and the modification of the power deposition of the 4.6 GHz wave by coupling the 2.45 GHz wave are investigated theoretically. According to the phase space analysis, the wave propagation domains of the two LH waves always overlap substantially with each other for typical LHCD experimental parameters on EAST, indicating that the coupling between them might be strong. Ray-tracing/Fokker-Planck simulations for a LH current drive experiment on EAST show that the change of the power deposition profile due to the coupling could be understood by the rise and fall of the tails of the parallel electron distribution functions on different flux surfaces. If either the injected wave power at 2.45 GHz is comparable with that at 4.6 GHz or the incident N|| of the 2.45 GHz wave reaches a high value (e.g., 5:7/[sqrt(Te(0)]), the power deposition profile of the 4.6GHz wave can be modified greatly due to the coupling with the 2.45 GHz wave. With the parameters compatible with the ability of the LH wave system on EAST, injection of the 2.45 GHz wave can still modify the power deposition profile of the 4.6 GHz wave significantly by combining those two approaches. Finally, it is shown how a 4.6 GHz wave which cannot be Landau damped when injected alone is absorbed in low density plasmas with a magnetic shear reversal configuration in the presence of a 2.45 GHz wave. |
| نوع الوثيقة: |
other/unknown material |
| اللغة: |
unknown |
| العلاقة: |
https://doi.org/10.7910/DVN/IJ8W9KTest |
| DOI: |
10.7910/DVN/IJ8W9K |
| الإتاحة: |
https://doi.org/10.7910/DVN/IJ8W9KTest |
| رقم الانضمام: |
edsbas.13FA73A9 |
| قاعدة البيانات: |
BASE |
