Experimental studies on ion acceleration and stream line detachment in a diverging magnetic field.
Experimental studies on ion acceleration and stream line detachment in a diverging magnetic field.
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DOI：
10.1063/1.3457139
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发表时间：
2010-07
影响因子：
2.2
通讯作者：
K. Terasaka;S. Yoshimura;K. Ogiwara;M. Aramaki;Masayoshi Tanaka
中科院分区：
文献类型：
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作者：
K. Terasaka;S. Yoshimura;K. Ogiwara;M. Aramaki;Masayoshi Tanaka
本文在电子回旋共振等离子体中实验研究了离子在发散磁场中的流动结构。用激光诱导荧光光谱标定的定向朗缪尔探针测量了离子的流速场。对于低离子温度等离子体，与气体动力效应相比，轴向电场引起的离子加速更为重要。当参数|f(ci)L(B)∕V(i)|为阶单位时，离子流线与磁力线分离，其中f（ci）、L(B)和V(i)分别为离子回旋频率、磁场不均匀性特征尺度长度和离子流动速度。在剥离区，等离子体中产生径向电场，离子在径向电场的驱动下沿E×B旋转方向直线运动。
The flow structure of ions in a diverging magnetic field has been experimentally studied in an electron cyclotron resonance plasma. The flow velocity field of ions has been measured with directional Langmuir probes calibrated with the laser induced fluorescence spectroscopy. For low ion-temperature plasmas, it is concluded that the ion acceleration due to the axial electric field is important compared with that of gas dynamic effect. It has also been found that the detachment of ion stream line from the magnetic field line takes place when the parameter |f(ci)L(B)∕V(i)| becomes order unity, where f(ci), L(B), and V(i) are the ion cyclotron frequency, the characteristic scale length of magnetic field inhomogeneity, and the ion flow velocity, respectively. In the detachment region, a radial electric field is generated in the plasma and the ions move straight with the E×B rotation driven by the radial electric field.