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首页> 外文期刊>Plasma physics and controlled fusion >Observations of core modes during RF-generated internal transport barriers in Alcator C-Mod
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Observations of core modes during RF-generated internal transport barriers in Alcator C-Mod

机译：在Alcator C-Mod中RF产生的内部传输壁垒期间的核心模式观察

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摘要

In the Alcator C-Mod tokamak, a high-resolution heterodyne ECE radiometer has been used to measure the electron temperature in plasma discharges with internal transport barriers (ITBs). ITBs are formed by the application of off-axis (r/a similar to 0.5) ICRF power. Strong density peaking indicates the formation of the ITB. When the ITB is formed, the ECE radiometer detects a small amplitude mode localized near the magnetic axis. Surprisingly, as this mode amplitude grows a dip in the temperature profile is clearly observed at the same location. If sawteeth are present, the mode amplitude appears to be suppressed by the sawtooth crash and no dip in the temperate profiles is observed. TORAY, a ray-tracing code, has been used to investigate the possible refractive effects of the steep density gradients in the ITB and its effects on the ECE observations. The results show that refractive effects can explain the observed local changes in temperature. Ray-tracing also indicates that the observed modes are density fluctuations. Observations of broadband density fluctuations during 4.5 T ITBs are also described.
机译：在Alcator C-Mod托卡马克中，高分辨率外差ECE辐射计已用于测量带有内部传输壁垒（ITB）的等离子体放电中的电子温度。 ITB是通过施加离轴（r / a类似于0.5）ICRF功率形成的。强烈的峰强度表明ITB的形成。当形成ITB时，ECE辐射计检测到位于磁轴附近的小振幅模式。出人意料的是，随着该模式振幅的增加，在同一位置可以清楚地观察到温度曲线的下降。如果存在锯齿，则模式振幅似乎被锯齿碰撞所抑制，并且未观察到温度曲线的下降。 TORAY是一种射线追踪代码，已用于研究ITB中陡峭的密度梯度的可能折射效应及其对ECE观测的影响。结果表明，折射效应可以解释观察到的局部温度变化。射线追踪还表明观察到的模式是密度波动。还描述了在4.5 T ITB期间宽带密度波动的观察结果。

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