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Intermittent transport in the plasma periphery of the T-10 tokamak

机译：T-10托卡马克血浆周边的间歇性运输

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摘要

Plasma periphery investigation performed in the T-10 tokamak has shown an essential increase of the perpendicular anomalous particle flux in the scrape-off layer (SOL) with an average plasma density rise. The strengthening of the radial transport is found to occur at an average electron density above a threshold level, which depends on a plasma current I-p. The value of the threshold level is about 0.3 times the Greenwald density. Langmuir probe measurements of SOL plasma parameters indicate that intermittent events can play a significant role in the cross-field transport. Intermittent behaviour of the plasma parameters is associated with formation and propagation of the plasma regions (or structures) with high density. The structures move in radial and poloidal directions. Radial movement is predominantly directed to the vacuum vessel wall in the SOL. The radial velocity of the high density plasma structures reduces from 1000 m s(-1) near the last closed flux surface to 200 m s(-1) at the wall of the vacuum chamber. The radial size of the structures also decreases with minor radius from 3 to 0.5 cm. The poloidal velocity is equal to 1000-1300 m s(-1) and is directed towards an ion diamagnetic velocity; the poloidal size of the plasma structures is 2-3 cm. The observed plasma structures can be responsible for more than 50% of the total radial turbulent particle flux. T-10 results support the hypothesis that intermittent convection rather than diffusion can define the cross-field transport.
机译：在T-10托卡马克中进行的等离子体外围研究表明，刮擦层（SOL）中垂直异常颗粒通量随平均血浆密度的增加而显着增加。发现径向传输的增强发生在高于阈值水平的平均电子密度上，该阈值水平取决于等离子体电流I-p。阈值水平的值约为格林瓦尔德密度的0.3倍。 Langmuir探针对SOL血浆参数的测量表明，间歇性事件可以在跨场传输中发挥重要作用。等离子体参数的间歇行为与高密度等离子体区域（或结构）的形成和传播有关。结构沿径向和极向运动。径向运动主要指向SOL中的真空容器壁。高密度等离子体结构的径向速度从最后一个封闭通量表面附近的1000 m s（-1）减小到真空室壁处的200 m s（-1）。结构的径向尺寸也随着3到0.5 cm的较小半径而减小。极向速度等于1000-1300 m s（-1），指向离子抗磁速度。等离子体结构的倍体尺寸为2-3 cm。观察到的等离子体结构可能占径向湍流总通量的50％以上。 T-10结果支持以下假设：间歇对流而不是扩散可以定义跨场传输。

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