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Thomson scattering analysis of large scale fluctuations in the ASDEX Upgrade edge

机译：汤姆森散射分析在ASDEX升级版边缘的大规模波动

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摘要

Large scale fluctuations in between edge localized modes (ELMs) are the main source for the scatter in plasma edge H mode profiles of electron density and temperature, as measured by high precision, high resolution Thomson scattering. These large scale fluctuations are also observed with electron cyclotron emission. They are quantitatively analysed by 2D poloidal snapshots of electron density and temperature, based on a 5 × 10 matrix of scattering volumes provided by the Thomson scattering system. Fluctuations with a quasi-periodic structure are found in a 2D snapshot with a frequency of about 61%. When interpreted as field-aligned helical structures toroidal quasi-mode numbers of 6–48 are found. The amplitudes of the fluctuations decrease with increasing quasi-mode number and edge profile gradient lengths. The amplitudes of the large scale structures in the steep gradient region are anti-correlated with the divertor Dα-intensity. The particle loss during an ELM is at least to a significant fraction due to the electron density 'blobs' observed in the scrape-off layer. The large scale fluctuations also perturb the measurement of 1D radial profiles. In the middle of the steep gradient region the perturbations are symmetric, but asymmetric both further inside (more minima) and further outside (more maxima).
机译：边缘局部化模式（ELMs）之间的大规模波动是电子边缘和电子密度和温度的等离子体H边模式分布中散射的主要来源，通过高精度，高分辨率的汤姆森散射测量。在电子回旋加速器发射中也观察到了这些大范围的波动。根据Thomson散射系统提供的5×10散射体积矩阵，通过电子密度和温度的二维极化快照对它们进行定量分析。在2D快照中发现准周期结构的波动，频率约为61％。当解释为场对齐的螺旋结构时，会发现6–48的环形准模数。波动幅度随准模数和边缘轮廓梯度长度的增加而减小。陡峭梯度区域中大型结构的振幅与偏滤器Dα强度呈反相关。由于在刮除层中观察到的电子密度“斑点”，ELM期间的颗粒损失至少要少得多。大范围的波动也会干扰一维径向轮廓的测量。在陡峭的梯度区域的中间，扰动是对称的，但在内部（更多的最小值）和外部（更多的最大值）两者都是不对称的。

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