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首页> 外文期刊>Plasma physics and controlled fusion >Comparison of fluctuations properties measured by Langmuir and ball-pen probes in the ISTTOK boundary plasma
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Comparison of fluctuations properties measured by Langmuir and ball-pen probes in the ISTTOK boundary plasma

机译：用Langmuir和Ball-pen探针在ISTTOK边界等离子体中测量的波动特性比较

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摘要

In this work, the fluctuations properties measured by Langmuir and ball-pen probes are compared, aiming at investigating the influence of temperature fluctuations on Langmuir probe measurements, including the cross-field turbulent particle flux. With this aim, a 5-pin probe was designed to estimate the radial particle transport due to fluctuations simultaneously using Langmuir and ball-pen probes. A considerable difference is observed in the amplitude of the floating potential fluctuations measured by the two types of probes, but not in statistical properties such as skewness. The turbulent particle flux was found to be roughly four times larger when measured with Langmuir probes. However, quantities such as the phase velocity of the fluctuations or the poloidal correlation lengths are not significantly different, as floating potential fluctuations measured by both types of probes are highly correlated and roughly in phase. Finally, it is suggested that ball-pen and emissive probes may underestimate the amplitude of the plasma potential fluctuations and therefore probe measurements must be carefully validated.
机译：在这项工作中，比较了Langmuir和圆珠笔探头测得的波动特性，旨在研究温度波动对Langmuir探头测量的影响，包括跨场湍流粒子通量。为此，使用Langmuir和圆珠笔探针设计了5针探针来估计由于波动而引起的径向粒子传输。观察到由两种类型的探头测得的浮动电位波动幅度存在很大差异，但在统计特性（例如偏度）中却没有。当用Langmuir探针测量时，发现湍流粒子通量大约大四倍。然而，诸如波动的相速度或倍性相关长度之类的量没有显着差异，因为通过两种类型的探头测量的浮动电势波动高度相关且大致同相。最后，建议原子笔和发射探针可能会低估等离子体电势波动的幅度，因此必须仔细验证探针的测量结果。

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