Investigation of a high spatial resolution method based on polar coordinate maximum entropy method for analyzing electron density fluctuation data measured by laser phase contrast.
Investigation of a high spatial resolution method based on polar coordinate maximum entropy method for analyzing electron density fluctuation data measured by laser phase contrast.
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研究基于极坐标最大熵法的高空间分辨率方法来分析激光相位衬度测量的电子密度波动数据。
DOI：
10.1063/1.3673636
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K. Matsuoka
中科院分区：
文献类型：
--
作者：
K. Matsuo;H. Iguchi;S. Okamura;K. Matsuoka
激光相衬是一种强大的诊断方法，用于确定磁约束等离子体中电子密度波动的空间分布，尽管其适用性取决于磁场配置。涨落的空间分辨率与传播方向的分辨率相关，传播方向的分辨率是从涨落波数的二维光谱分析中得出的。该方法适用于紧凑螺旋系统中的波动测量。为了在相对较少的数据点下提高传播方向的分辨率，采用极坐标最大熵方法。获得了 1 cm 数量级的空间分辨率，这在短半径为 20 cm 的等离子体中是令人满意的。
Laser phase contrast is a powerful diagnostic method to determine the spatial distribution of electron density fluctuations in magnetically confined plasmas, although its applicability depends on magnetic field configurations. The spatial resolution of fluctuations is linked with the resolution of the propagation direction that is derived from the two-dimensional spectral analysis of the wavenumber for the fluctuations. The method was applied to fluctuation measurements in a compact helical system. In order to improve the resolution of the propagation direction with a relatively small number of data points, the maximum entropy method with polar coordinates was employed. A spatial resolution of the order of 1 cm was obtained, which is satisfactory in a plasma with a 20 cm minor radius.
影响因子：
8.6
作者：
Fujisawa, A;Itoh, K;Diamond, PH
通讯作者：
Diamond, PH
紧凑螺旋系统中离子温度和等离子体旋转剖面的全局和边缘局部结构的同步光谱测量
DOI：
--
发表时间：
2007
期刊：
Plasma and Fusion Research vol. 2
影响因子：
--
作者：
S.Nishimura;K.Nagaoka;Y.Yoshimura;K.Nakamura;H.;Iguchi;et al.
通讯作者：
et al.