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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Influence of gas pressure on the structure and dynamics of dust rotation in magnetized dusty plasmas
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Influence of gas pressure on the structure and dynamics of dust rotation in magnetized dusty plasmas

机译：气压对磁化粉尘等离子体中粉尘旋转结构和动力学的影响

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The structure and dynamics of dust rotation under a magnetic field at different gas pressures in the sheath of a radio-frequency discharge are investigated in this paper. The influence of gas pressure on the rotational properties of the dust particles located in different layers is studied in detail. Both rigid rotation (all the dust particles move with a constant angular velocity) and sheared rotation (the angular velocity of the dust particles has a radial distribution) of the dust particles induced by a magnetic field are observed. With increasing gas pressure, the angular velocity of the rotating dust particles in all layers decreases. Under specific experimental conditions, the angular velocity of the dust particles in the lower layer is lower than that of the dust particles in the upper layers. With increasing gas pressure, dust particles in the lower layer stop rotating earlier than those in the upper layers. At a critical (high) gas pressure, dust particles in the lower layers also reverse their rotation direction earlier than those in the upper layers. Within the same dust layer, particles located in the inner region stop rotating and reverse their rotation direction earlier than those in the outer region. At a sufficiently high angular velocity, a void (dust-free region) is formed in the dust cloud, leaving the dust particles rotating in a layer at the system edge. When the gas pressure becomes too high, the voids can be destroyed, and the dust particles are redistributed in the dust cloud. Finally, a 3D spindle-shaped configuration of the dust cloud in the plasma sheath can also be obtained. The experimental results are discussed in detail.
机译：本文研究了射频放电鞘中不同气体压力下磁场下粉尘旋转的结构和动力学。详细研究了气体压力对位于不同层中的粉尘颗粒旋转特性的影响。观察到由磁场引起的尘埃颗粒的刚性旋转（所有尘埃颗粒以恒定的角速度移动）和剪切旋转（尘埃颗粒的角速度具有径向分布）。随着气体压力的增加，所有层中旋转的灰尘颗粒的角速度减小。在特定的实验条件下，下层灰尘颗粒的角速度低于上层灰尘颗粒的角速度。随着气压的升高，下层的灰尘颗粒比上层的灰尘颗粒更早地停止旋转。在临界（高）气压下，下层中的灰尘颗粒也比上层中的灰尘颗粒更早地反转其旋转方向。在同一灰尘层内，位于内部区域的粒子比外部区域的粒子停止旋转并更早地反转其旋转方向。在足够高的角速度下，尘埃云中会形成一个空隙（无尘区域），使尘埃颗粒在系统边缘的一层中旋转。当气压太高时，空隙会被破坏，灰尘颗粒会重新分布在灰尘云中。最后，还可以获得等离子护套中尘埃云的3D纺锤形配置。实验结果进行了详细讨论。

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