Abstract
In tokamaks, fusion generated α particles may absorb lower hybrid (LH) wave energy, thus reducing the LH current drive efficiency. The absorption coefficient γα of LH waves due to α particles changing with some typical parameters is calculated in this paper. Results show that γα increases with the parallel refraction index n ‖, while decreases with the frequency of LH waves ω over a wide range. Higher background plasma temperature and toroidal magnetic field will increase the absorption. The absorption coefficient γα increases with n e when n e ≤ 8 × 1019 m−3, while decreases with n e when n e becomes larger, and there is a peak value of γα when n e ≈ 8 × 1019 m−1 for the ITER-like scenario. The influence of spectral broadening in parametric decay instabilities on the absorption coefficient is evaluated. The value of γα with n ‖ being 2.5 is almost two times larger than that with n ‖ being 2.0 and is even lager in the case of 2.9, which will obviously increase the absorption of the LH power by alpha particles.
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Wang, J., Zhang, X., Yu, L. et al. Influence of plasma parameters on the absorption coefficient of alpha particles to lower hybrid waves in tokamaks. Plasma Phys. Rep. 40, 932–938 (2014). https://doi.org/10.1134/S1063780X14100080
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DOI: https://doi.org/10.1134/S1063780X14100080