Improvement of the Laser Phase Contrast Method for Measuring the Spatial Distribution of Electron Density Fluctuations in Heliotron E
Improvement of the Laser Phase Contrast Method for Measuring the Spatial Distribution of Electron Density Fluctuations in Heliotron E
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Heliotron E 中电子密度涨落空间分布测量激光相差法的改进
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
T. Obiki
中科院分区：
文献类型：
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作者：
S. Kado;T. Irie;K. Muraoka;K. Matsuo;Kenji Tanaka;K. Kondo;F. Sano;T. Obiki
激光相位衬度法适用于测量垂直于激光束轴传播的长波涨落。通过利用连接到相位板的狭缝选择环形约束系统的剪切磁场的特定方向，将迄今已沿视线积分的可获得数据改进为沿束轴空间分辨。首先，建立了空间分辨率的公式，并用模拟等离子体中密度起伏的超声波检验了其有效性。然后，将该方法应用于氦加速器E装置中的等离子体放电，得到了波数(K)-频率(f=Ω/2π)谱，S(K，f)表明空间区域得到了确定的分辨。
The laser phase contrast method is suitable for measuring long wavelength fluctuations propagating perpendicular to the laser beam axis. The obtainable data, which have so far been integrated along line-of-sights, are improved to be spatially resolved along the beam axis by selecting a particular direction of the sheared magnetic field of a toroidal confinement system utilizing a slit attached to a phase plate. First, the spatial resolution was formulated, and its validity was examined using an ultrasonic wave which simulated density fluctuations in plasmas. Then, the method was applied to plasma discharges in the Heliotron E device, and wavenumber (K)-frequency (f=Ω/2π) spectra, S(K, f), shows that the spatial regions were surely resolved.