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Effect of lower hybrid waves on turbulence and transport of particles and energy in the FTU tokamak scrape-off layer plasma

V Pericoli Ridolfini2011年Plasma Physics and Controlled FusionIF 2.2出版社

All the main features of the scrape-off layer turbulence, magnitude, frequency spectrum and perpendicular wave vector, ξt, are strongly affected by the injection of lower hybrid (LH) power into the FTU tokamak. The governing parameters are the local last closed magnetic surface values of density, ne,LCMS, and temperature, Te,LCMS. ne,LCMS determines the perpendicular wave vector of the LH waves, which is a key parameter for the multiple scattering processes, and together with Te,LCMS the collisionality that exerts a stabilizing effect on the fluctuations. This effect, still to be examined in the light of theoretical models, leads to an asymptotic value for the fluctuation relative amplitude in the ohmic phase close to 25%, and ∼10% in the LH phase, or even less, since the saturation level is not yet attained. The LH waves also can strongly raise ξt, about 3 times, and double the root mean square frequency. The transfer of momentum and energy in the mutual scattering of LH and turbulence 'waves' drives these changes. An increase also of the cross-correlation between temperature and electric potential fluctuations should occur in order to explain the magnitude of the fluctuation amplitude drop and the large increment of the temperature e-folding decay, by more than a factor of 2.5. Particle transport, however, does not appear to be affected to a large extent—the density e-folding decay length is almost unchanged but the power flow typical length rises by about a factor of 1.5, which is a relevant figure in view of the problem of mitigating the power loads on divertor targets in future reactors. These changes are confined mainly within the flux tube connected with the LH waves launching antenna, but start to spread significantly out of it at high plasma densities.

日本語訳

スクレイプオフ層乱流の主な特徴、すなわち大きさ、周波数スペクトル、および垂直波数ベクトルξtは、FTUトカマクへの低混成波(LH)パワーの入射によって強く影響を受ける。支配的なパラメータは、局所的な最終閉磁気面における密度ne,LCMSと温度Te,LCMSである。ne,LCMSはLH波の垂直波数ベクトルを決定し、これは多重散乱過程の鍵となるパラメータであり、Te,LCMSとともに、乱流の安定化に寄与する衝突度を決定する。この効果は、理論モデルの観点からまだ検討されるべきものであるが、オーミック相における乱流相対振幅の漸近値が約25%に達し、LH相では約10%以下になることを導く。なぜなら、飽和レベルはまだ達成されていないからである。LH波はまた、ξtを約3倍に強く増加させ、周波数の二乗平均平方根を2倍にする。乱流とLH波の相互散乱における運動量とエネルギーの輸送がこれらの変化を駆動する。温度と電位のゆらぎ間の相互相関の増加もまた、乱流振幅の低下と温度のe-folding減衰長の大きな増加(2.5倍以上)の大きさを説明するために生じるはずである。しかし、粒子輸送は大きな影響を受けないように見える。密度のe-folding減衰長はほぼ不変であるが、パワーフローの特性長は約1.5倍増加する。これは、将来の炉におけるダイバータターゲットへの熱負荷を軽減する問題に関連する重要な数値である。これらの変化は主にLH波のランチングアンテナに接続された磁束管内に限定されるが、高プラズマ密度ではその外側へ有意に広がり始める。

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Scrape-off layerLower hybridFTU
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