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Edge plasma characteristics in the helicity injected torus (HIT-II) spherical tokamak

机译：螺旋注入圆环（HIT-II）球形托卡马克中的边缘等离子体特征

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The helicity injected torus (HIT-II) device is a spherical tokamak capable of both inductive (Ohmic) and co-axial helicity injection (CHI) current drive. The HIT-II plasma edge, in both Ohmic and CHI discharges, has been characterized using a triple Langmuir probe. An Ohmic discharge develops in two phases, a slide-away phase followed by a normal Ohmic discharge. During the normal Ohmic discharge, the floating potential is negative, just as in a conventional large-aspect-ratio tokamak. The plasma density increases sharply from the plasma edge into the centre. The auto-power spectrum of Ohmic plasma edge fluctuations shows a nearly constant auto-power at low frequencies, with auto-power decreasing at higher frequencies, similar to observations in conventional large-aspect-ratio tokamaks. In HIT-II CHI discharges, the magnetic field lines at the plasma edge are clearly connected to the injector electrodes, as expected. However, the time-evolution of the floating potential in the core plasma is significantly different from that of the edge, which may indicate a decoupling of the core plasma from the CHI electrodes. Finally, the fluctuations at the edge of high-performance CHI discharges exhibit a coherent oscillation at a frequency similar to that of the observed n = 1 mode. [References: 14]
机译：螺旋注入环（HIT-II）装置是一种球形托卡马克，能够感应（欧姆）和同轴螺旋注入（CHI）电流驱动。使用三重Langmuir探针对欧姆和CHI放电中的HIT-II等离子体边缘进行了表征。欧姆放电分为两个阶段：滑动阶段，然后是正常的欧姆放电。在正常的欧姆放电过程中，浮动电位为负，就像常规的大纵横比托卡马克一样。等离子体密度从等离子体边缘到中心急剧增加。欧姆等离子体边缘波动的自功率谱在低频下显示出几乎恒定的自功率，而在更高的频率下自功率下降，这与常规大纵横比托卡马克中的观察结果相似。如预期的那样，在HIT-II CHI放电中，等离子边缘的磁场线显然已连接到注入器电极。然而，核心等离子体中的浮动电位的时间演化与边缘的显着不同，这可能表明核心等离子体与CHI电极的去耦。最后，高性能CHI放电边缘的波动在与观察到的n = 1模式相似的频率下表现出相干振荡。 [参考：14]

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