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首页> 外文期刊>Plasma physics and controlled fusion >Study of ion sheath expansion and anisotropy of the electron parallel energy distribution in the CASTOR tokamak
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Study of ion sheath expansion and anisotropy of the electron parallel energy distribution in the CASTOR tokamak

机译：CASTOR托卡马克中离子鞘层扩展和电子平行能分布的各向异性研究

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摘要

A novel diagnostic, the tunnel probe, is used to investigate the edge plasma of the CASTOR tokamak. Comparison with conventional small, cylindrical Langmuir probes (typical of those usually employed for turbulence measurements in magnetized plasmas) demonstrates the superiority of the tunnel probe. The collectors of the tunnel probe are concave, eliminating in theory all uncertainty of the effective collecting area, and thereby rendering the measurement of parallel ion current density, electron temperature, and floating potential more reliable. Two tunnel probes, mounted back-to-back in a Mach probe arrangement, are used to investigate directional asymmetries of the plasma parameters. The tunnel probes are used as standard Langmuir probes by applying voltage sweeps simultaneously to all their internal conductors. The measured electron temperature is higher on the electron side than on the ion side, and the floating potential is lower. The observed asymmetries, measured at low density and collisionality in CASTOR, could be consistent with a hot tail of non-thermal electrons flowing in the counter-current direction. The ratio of ion saturation currents to the internal conductors of the tunnel probe provides a second independent measurement of electron temperature whose directional asymmetry is less pronounced, in agreement with recent theoretical predictions that tunnel probes should be less sensitive to non-thermal electrons than Langmuir probes in certain conditions.
机译：一种新颖的诊断方法，即隧道探针，用于研究CASTOR托卡马克的边缘等离子体。与传统的小型圆柱形Langmuir探头（通常用于磁化等离子体中的湍流测量的探头）的比较证明了隧道探头的优越性。隧道探针的集电极是凹形的，理论上消除了有效收集区域的所有不确定性，从而使平行离子电流密度，电子温度和浮置电位的测量更加可靠。两个隧道探头背对背安装在Mach探头中，用于研究等离子体参数的方向不对称性。隧道探头通过同时对所有内部导体施加电压扫描而用作标准的Langmuir探头。在电子侧测得的电子温度高于在离子侧，浮置电势较低。在CASTOR中以低密度和碰撞性测得的观察到的不对称性可能与非热电子在逆流方向上的热尾部一致。离子饱和电流与隧道探针内部导体的比值提供了电子温度的第二独立测量，其方向不对称性不太明显，这与最近的理论预测一致，即隧道探针对非热电子的敏感性应低于Langmuir探针在某些情况下。

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