Impact of the electron density and temperature gradient on drift-wave turbulence in the Large Plasma Device
Impact of the electron density and temperature gradient on drift-wave turbulence in the Large Plasma Device
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电子密度和温度梯度对大型等离子体装置中漂移波湍流的影响
DOI：
10.1017/s0022377822000630
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发表时间：
2022
影响因子：
2.5
通讯作者：
Schaffner, David
中科院分区：
文献类型：
--
作者：
Perks, Conor;Mordijck, Saskia;Carter, Troy;Van Compernolle, Bart;Vincena, Stephen;Rossi, Giovanni;Schaffner, David
在本文中，我们提出了在加州大学洛杉矶分校的大型等离子体装置的边缘湍流的实验研究。我们利用放电功率和预充压力（中性密度）的扫描实验表明，湍流密度波动随着密度梯度的减小而减小，如预测的电阻漂移波湍流（RDWT）。正如RDWT所预期的那样，我们观察到密度和电势波动之间的交叉相位接近于0。此外，电子温度梯度的增加导致密度波动的幅度减小，正如RDWT所预期的那样。然而，与理论预期相反，我们发现无论是密度梯度的变化还是温度梯度的增加，潜在的波动都不遵循与密度波动相同的趋势。密度和电位波动之间的断开与预充压力（即中性密度）差异导致的平行流变化有关。密度和电势波动谱的进一步分析表明，电子温度梯度降低了低频波动高达，同时保持典型的电阻漂移波交叉相位在较低的频率。这些实验部分证实了现有的知识电阻漂移波湍流，但也引入了新的意见，表明需要专门的非线性三维湍流模拟，包括中性。
In this paper we present an experimental study of edge turbulence in the Large Plasma Device at UCLA. We utilize a scan of discharge power and prefill pressure (neutral density) to show experimentally that turbulent density fluctuations decrease with decreasing density gradient, as predicted for resistive drift-wave turbulence (RDWT). As expected for RDWT, we observe that the cross-phase between the density and potential fluctuations is close to 0. Moreover, the addition of an electron temperature gradient leads to a reduction in the amplitude of the density fluctuations, as expected for RDWT. However, counter to theoretical expectations, we find that the potential fluctuations do not follow the same trends as the density fluctuations for changes either in density gradients or the addition of a temperature gradient. The disconnect between the density and potential fluctuations is connected to changes in the parallel flows as a result of differences in the prefill pressure, i.e. neutral density. Further analysis of the density and potential fluctuation spectra show that the electron temperature gradient reduces the low frequency fluctuations up to , while maintaining the typical resistive drift-wave cross-phase at lower frequencies. These experiments partly confirm existing knowledge on resistive drift-wave turbulence, but also introduce new observations that indicate a need for dedicated nonlinear three-dimensional turbulence simulations that include neutrals.
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