| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Effect of Wave Accessibility on Lower Hybrid Wave Current Drive in Experimental Advanced Superconductor Tokamak with H-Mode Operation |
| LI Xin-Xia1,2, XIANG Nong2**, GAN Chun-Yun2 |
1Department of Nuclear Physics, University of South China, Hengyang 421001
2Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031
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| Cite this article: |
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LI Xin-Xia, XIANG Nong, GAN Chun-Yun 2015 Chin. Phys. Lett. 32 035202 |
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Abstract The effect of the wave accessibility condition on the lower hybrid current drive in the experimental advanced superconductor Tokamak (EAST) plasma with H-mode operation is studied. Based on a simplified model, a mode conversion layer of the lower hybrid wave between the fast wave branch and the slow wave branch is proved to exist in the plasma periphery for typical EAST H-mode parameters. Under the framework of the lower hybrid wave simulation code (LSC), the wave ray trajectory and the associated current drive are calculated numerically. The results show that the wave accessibility condition plays an important role on the lower hybrid current drive in EAST plasma. For wave rays with parallel refractive index n||=2.1 or n||=2.5 launched from the outside midplane, the wave rays may penetrate the core plasma due to the toroidal geometry effect, while numerous reflections of the wave ray trajectories in the plasma periphery occur. However, low current drive efficiency is obtained. Meanwhile, the wave accessibility condition is improved if a higher confined magnetic field is applied. The simulation results show that for plasma parameters under present EAST H-mode operation, a significant lower hybrid wave current drive could be obtained for the wave spectrum with peak value n||=2.1 if a toroidal magnetic field BT=2.5 T is applied.
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Published: 26 February 2015
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| PACS: |
52.55.Fa
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(Tokamaks, spherical tokamaks)
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52.35.Mw
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(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
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52.35.Hr
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(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
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52.50.Sw
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(Plasma heating by microwaves; ECR, LH, collisional heating)
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