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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Spatially localized turbulence measurements using CO_ 2 laser collective scattering diagnostics on the HT-7
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Spatially localized turbulence measurements using CO_ 2 laser collective scattering diagnostics on the HT-7

机译：在HT-7上使用CO_2激光集体散射诊断技术对空间进行湍流测量

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摘要

An electromagnetic wave coherent scattering system has poor longitudinal spatial localization. However, considering the spatial variation of magnetic field lines and the perpendicularity of the short-scale turbulence to these magnetic field lines, we may be able to obtain spatially localized turbulence measurements. In this paper, we first describe the method and simulation results for localized turbulence measurements by a CO_ 2 laser (λ= 10.6μm) collective scattering diagnostic on the HT-7. Second, we study the performance of electron density fluctuations between channel 1 (α = ?5°, K_ 1 = 15 cm~ (?1)) and channel 2 (α= 0°, k_ 2 = 15 cm~ (?1)) during sawtooth activities. After a sawtooth crash, the signals of channel 1 change considerably and the signals of channel 2 remain nearly the same; cross-correlations between the two channels are very low (≈0.1). These experimental results verify that our CO_ 2 laser collective scattering diagnostic does have some spatial resolution on HT-7.
机译：电磁波相干散射系统的纵向空间定位较差。但是，考虑到磁力线的空间变化以及短尺度湍流与这些磁力线的垂直度，我们也许能够获得空间局部的湍流测量值。在本文中，我们首先描述通过HT-7上的CO_2激光（λ=10.6μm）集体散射诊断进行局部湍流测量的方法和模拟结果。其次，我们研究通道1（α=？5°，K_1 = 15 cm〜（？1））和通道2（α= 0°，k_2 = 15 cm〜（？1）之间的电子密度波动的性能。 ）期间进行锯齿活动。锯齿形碰撞后，通道1的信号变化很大，而通道2的信号几乎保持不变;两个通道之间的互相关非常低（≈0.1）。这些实验结果证明，我们的CO_2激光集体散射诊断确实对HT-7具有一定的空间分辨率。

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