Practical solutions for reliable triple probe measurements in magnetized plasmas.
Practical solutions for reliable triple probe measurements in magnetized plasmas.
复制标题
在磁化等离子体中进行可靠的三探针测量的实用解决方案。
DOI：
10.1063/1.3516045
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
A. Fasoli
中科院分区：
文献类型：
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作者：
C. Theiler;I. Furno;A. Kuenlin;Philippe Marmillod;A. Fasoli
详细研究了获得密度、电子温度和等离子体电势的局部时间分辨测量的三探针方法。讨论并克服了使用该技术获得可靠测量的困难。这些包括相位延迟误差、离子鞘膨胀以及由于对地杂散电容导致的有限带宽。具体地，描述了相对简单的电子电路以极大地减少杂散电容。使用三重探针进行的测量是在 TORPEX 装置中以交换驱动的湍流为特征的等离子体中进行的。测量的时间平均和时间相关的条件平均参数与其他基于朗缪尔探针的技术进行交叉检查，并显示出良好的一致性。三探针测量表明电子温度波动足够大，使得等离子体电位波动与浮动电位波动的识别并不是一个很好的近似。然而，在大的径向区域上，时间平均波动引起的粒子通量只能从浮动电势推导出来。这是因为密度和电子温度之间的相移接近于零，并且温度波动不会引起净径向粒子输运。
The triple probe method to obtain local, time-resolved measurements of density, electron temperature and plasma potential is investigated in detail. The difficulties in obtaining reliable measurements with this technique are discussed and overcome. These include phase delay errors, ion sheath expansion and limited bandwidth due to stray capacitance to ground. In particular, a relatively simple electronic circuit is described to strongly reduce stray capacitance. Measurements with the triple probe are presented in a plasma characterized by interchange-driven turbulence in the TORPEX device. The measured time-averaged and time-dependent, conditionally averaged parameters are cross-checked with other Langmuir probe based techniques, and show good agreement. Triple probe measurements show that electron temperature fluctuations are sufficiently large, such that the identification of plasma potential fluctuations with fluctuations of the floating potential is not a good approximation. Over a large radial region, the time-averaged fluctuation-induced particle flux can, however, be deduced from floating potential only. This is because the phase shift between density and electron temperature is close to zero there and temperature fluctuations do not give rise to a net radial particle transport.
用于局部 3D 离子流测量系统的光学探头
DOI：
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发表时间：
2017
期刊：
影响因子：
--
作者：
Hideya Koike;Hiroshi Tanabe;Ono Yasushi
通讯作者：
Ono Yasushi