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Quasi-linear transport inferred from density fluctuation spectra

R.V. Bravenec, D.W. Ross, P.M. Schoch, D.L. Brower, J.W. Heard, R.L. Hickok, P.W. Terry, A.J. Wootton, Xuanzong Yang1991年被引用 36Nuclear FusionIF 3出版社

Expressions for the quasi-linear electrostatic electron particle and heat fluxes are derived in the wave frequency and electron collisionality regimes appropriate to the interior of the TEXT tokamak. These are expressed in terms of moments of the density fluctuation spectrum accounting for poloidal plasma rotation. Minimal assumptions are made as to the origin of the turbulence. The fluxes are then evaluated for an appropriate discharge condition on TEXT, using the density fluctuation frequency spectrum and equilibrium plasma potential measured by a heavy ion beam probe (HIBP). These are compared with the experimental fluxes for two measurements of the normalized rms poloidal wave number kθ,rmsρs. For kθ,rmsρs ≈ 0.1, which is an upper bound of the HIBP two-point phase shift measurements, the electrostatic fluxes are negligible and the rms frequency of the fluctuations is much larger than the Doppler shifted electron diamagnetic drift frequency. However, for kθ,rmsρs ≈ 0.3, as supported by far-infrared (FIR) scattering and as expected for drift waves, the electrostatic fluxes are sufficient to account for the observed fluxes in the region of low collisionality. In addition, the rms frequency (consistent with FIR scattering) agrees with the Doppler shifted electron diamagnetic drift frequency. However, the computed fluxes fall increasingly short of the observed fluxes with increasing radius.

日本語訳

静電粒子束および熱流束は、TEXTトカマクの内部において、重イオンビームプローブ(HIBP)を用いて測定された。これらの流束は、密度揺動およびポテンシャル揺動の両方の測定から得られた局所的な揺動分散関係を用いて評価された。正規化された二乗平均平方根(rms)ポロイダル波数k_θ,rmsρ_sが約0.1である場合、これはHIBPの二点位相シフト測定の上限に相当するが、静電流束は無視できる程度であり、揺動のrms周波数はドップラーシフトした電子反磁性ドリフト周波数よりもはるかに大きい。しかしながら、k_θ,rmsρ_sが約0.3の場合、これは遠赤外線(FIR)散乱によって支持され、ドリフト波に期待される値であるが、静電流束は低衝突度領域において観測された流束を説明するのに十分である。さらに、rms周波数(FIR散乱と一致)はドップラーシフトした電子反磁性ドリフト周波数と一致する。しかしながら、計算された流束は、半径が増加するにつれて観測された流束に対してますます不足する。

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Density fluctuation
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