Critical temperature gradient length signatures in heat wave propagation across internal transport barriers in the Joint European Torus
Critical temperature gradient length signatures in heat wave propagation across internal transport barriers in the Joint European Torus
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DOI：
10.1063/1.2772618
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发表时间：
2007-09
影响因子：
2.2
通讯作者：
A. Casati;P. Mantica;D. V. Eester;N. Hawkes;F. Imbeaux;E. Joffrin;A. Marinoni;F. Ryter;A. Salmi;T. Tala;P. Vries
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文献类型：
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作者：
A. Casati;P. Mantica;D. V. Eester;N. Hawkes;F. Imbeaux;E. Joffrin;A. Marinoni;F. Ryter;A. Salmi;T. Tala;P. Vries
离子回旋共振加热功率调制在欧洲联合环面（JET）中电子热波传播的新结果[P]。H. Rebut等人，核。提出了以内部传输屏障（ITBs）为特征的等离子体。热流在中热带外产生并穿过中热带，总是在中热带层经历强烈的阻尼，表现出低水平的传输和刚度损失。然而，在某些情况下，热浪在中热带外的区域强烈膨胀，表现出类似对流的行为特征。在其他情况下，扰动幅度的第二个最大值在靠近ITB脚处产生。这种特殊类型的行为可以在紊流输运开始的临界温度梯度长度存在的基础上加以解释。当阈值足够高时，类对流特征出现在阈值附近（即在ITB脚外），与理论匹配良好。
New results on electron heat wave propagation using ion cyclotron resonance heating power modulation in the Joint European Torus (JET) [P. H. Rebut et al., Nucl. Fusion 25, 1011 (1985)] plasmas characterized by internal transport barriers (ITBs) are presented. The heat wave generated outside the ITB, and traveling across it, always experiences a strong damping in the ITB layer, demonstrating a low level of transport and loss of stiffness. In some cases, however, the heat wave is strongly inflated in the region just outside the ITB, showing features of convective-like behavior. In other cases, a second maximum in the perturbation amplitude is generated close to the ITB foot. Such peculiar types of behavior can be explained on the basis of the existence of a critical temperature gradient length for the onset of turbulent transport. Convective-like features appear close to the threshold (i.e., just outside the ITB foot) when the value of the threshold is sufficiently high, with a good match with the theoreti...