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首页> 外文期刊>Nuclear fusion >MEASUREMENTS OF ICRF LOADING ON DIII-D WITH AND WITHOUT A FARADAY SHIELD
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MEASUREMENTS OF ICRF LOADING ON DIII-D WITH AND WITHOUT A FARADAY SHIELD

机译：带或不带法拉第护罩的DIII-D上ICRF负载的测量

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摘要

Measurements of radiofrequency (RF) loading on the Doublet III D shape (Dill-D) tokamak using a fast wave ion cyclotron antenna with and without a Faraday shield present indicate that the loading resistance seen by the antenna is significantly higher at low values of RF power (P <= 20 kW with no Faraday shield) than is predicted by standard fast wave antenna coupling theory. Measurements of the density profile in the plasma edge region allow a direct comparison of calculated and measured loading. At high power, the calculated fast wave loading agrees with the measurements. The high loading observed at low power can be explained by direct losses in an RF enhanced sheath. The density value at the current strap of ≈4 × 10~10 cm~-3 needed to give the observed loading behaviour is in agreement with the measured density values in the plasma scrape-off region, extrapolated to the current strap location using a simple Bohm diffusion model.
机译：使用带和不带法拉第屏蔽的快速波离子回旋加速器天线对Doublet III D形状（Dill-D）托卡马克上的射频（RF）负载进行测量，表明在低RF值下，天线看到的负载电阻明显更高功率（P <= 20 kW，无法拉第屏蔽）比标准快速波天线耦合理论预测的功率大。在等离子体边缘区域中的密度分布的测量值可以直接比较计算出的载荷和测量出的载荷。在高功率下，计算出的快速波载荷与测量值一致。在低功率下观察到的高负载可以通过RF增强护套中的直接损耗来解释。给出观察到的载荷行为所需的当前条带上的密度值≈4×10〜10 cm〜-3与等离子刮除区域中测得的密度值一致，使用简单的方法将其推算到当前条带位置玻姆扩散模型。

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