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首页> 外文期刊>Plasma physics and controlled fusion >Investigation of small-scale tokamak plasma turbulence by correlative UHR backscattering diagnostics
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Investigation of small-scale tokamak plasma turbulence by correlative UHR backscattering diagnostics

机译：通过相关的UHR背向散射诊断研究小型托卡马克等离子体湍流

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摘要

Fine scale turbulence is considered nowadays as a possible candidate for the explanation of anomalous ion and electron energy transport in magnetized fusion plasmas. The unique correlative upper hybrid resonance backscattering (UHR BS) technique is applied at the FT-2 tokamak for investigation of density fluctuations excited in this turbulence. The measurements are carried out in Ohmic discharge at several values of plasma current and density and during current ramp up experiment. The moveable focusing antennas set have been used in experiments allowing probing out of equatorial plane. The radial wave number spectra of the small-scale component of tokamak turbulence are determined from the correlation data with high spatial resolution. Two small-scale modes possessing substantially different phase velocities are observed in plasma under conditions when the threshold for the electron temperature gradient mode excitation is overcome. The possibility of plasma poloidal velocity profile determination using the UHR BS signal is demonstrated.
机译：如今，精细湍流被认为是解释磁化聚变等离子体中异常离子和电子能量传输的可能候选者。 FT-2托卡马克采用了独特的相关上部混合共振反向散射（UHR BS）技术来研究在这种湍流中激发的密度波动。测量是在欧姆放电中在等离子电流和密度的几个值下进行的，并且在电流增加实验期间进行。可移动聚焦天线组已用于允许从赤道平面探测的实验中。托卡马克湍流小尺度分量的径向波谱由高空间分辨率的相关数据确定。在克服了电子温度梯度模式激发的阈值的条件下，在等离子体中观察到两种具有基本不同的相速度的小规模模式。证明了使用UHR BS信号确定血浆极向速度分布的可能性。

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