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首页> 外文期刊>Plasma physics and controlled fusion >Characterization of the 20kHz transient MHD burst at the fast U-3M confinement modification stage
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Characterization of the 20kHz transient MHD burst at the fast U-3M confinement modification stage

机译：在快速U-3M监禁修改阶段的20kHz瞬态MHD突发的表征

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In the URAGAN-3M (U-3M) torsatron the low-frequency transient 20-30 kHz mode is observed during the plasma confinement transition that occurs at a plasma current value of about 1 kA. The burst of this mode is always accompanied by the fast jump of the Alfven eigenmode frequency. The transient 20-30 kHz mode contains two parts. The non-rotating part of the mode has higher amplitude and is localized in the stochastic region of the plasma. It is observed only in the vicinity of the radio-frequency antenna used for plasma production and does not propagate along the torus because of fast losses. Its high amplitude indicates that the major part of the 20-30 kHz mode is excited in the stochastic region near the antenna. In contrast, the second rotating part of the mode is localized everywhere along the torus near the plasma edge (p = 0.8-1). This is the n/m = 1/2 mode that rotates in the electron diamagnetic direction. It is observed in different toroidal cross-sections by various diagnostics (magnetic probe array, optics, Langmuir probe). Appearance of the 1/2 rational surface at the stochastic magnetic field line region near the plasma edge at 1 kA plasma current stage can be responsible for the mode generation. Modification of electron component gradients in the mode generation region near the antenna and the drop of the fast ion concentration (above 1 keV) in this region are observed simultaneously with the mode generation. The mode can be exited by the strong transient plasma gradients generated in the vicinity of the rational surface by the antenna.
机译：在乌拉克-3M（U-3M）躯干中，在等离子体限制转变期间观察到低频瞬态20-30kHz模式，其在约1ka的等离子体电流值下发生。这种模式的突发始终伴随着ALFven EIGENMODE频率的快速跳跃。瞬态20-30 kHz模式包含两部分。该模式的非旋转部分具有较高的幅度并且在等离子体的随机区域中定位。仅在用于等离子体生产的射频天线附近观察到它，并且由于快速损失而不会沿着圆环传播。其高幅度表示20-30 kHz模式的主要部分在天线附近的随机区域中兴奋。相反，该模式的第二旋转部分沿着等离子体边缘附近的环形沿着圆环定位（P = 0.8-1）。这是N / M = 1/2模式，其在电子抗磁方向上旋转。通过各种诊断（磁探测阵列，光学，Langmuir探针）在不同的环形横截面中观察到它。在距离等离子体电流级的等离子体边缘附近的随机磁场线区域的1/2合理表面的外观可能是对模式产生的负责。与模式生成同时观察到天线附近的模式生成区域中的电子分量梯度和该区域中的快速离子浓度（高于1keV）的下降。该模式可以通过天线在合理表面附近产生的强瞬态等离子体梯度退出。

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