Tojo H, Yamada I, Yasuhara R, Yatsuka E, Funaba H, Hatae T, Hayashi H, Itami K
Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193, Japan.
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan.
Rev Sci Instrum. 2014 Nov;85(11):11D865. doi: 10.1063/1.4896478.
This paper provides a novel method for evaluating signal intensities in incoherent Thomson scattering diagnostics. A double-pass Thomson scattering system, where a laser passes through the plasma twice, generates two scattering pulses from the plasma. Evaluations of the signal intensities in the spectrometer are sometimes difficult due to noise and stray light. We apply the singular value decomposition method to Thomson scattering data with strong noise components. Results show that the average accuracy of the measured electron temperature (Te) is superior to that of temperature obtained using a low-pass filter (<20 MHz) or without any filters.
本文提供了一种评估非相干汤姆逊散射诊断中信号强度的新方法。在双程汤姆逊散射系统中，激光两次穿过等离子体，会从等离子体产生两个散射脉冲。由于噪声和杂散光的存在，有时很难对光谱仪中的信号强度进行评估。我们将奇异值分解方法应用于具有强噪声成分的汤姆逊散射数据。结果表明，所测量的电子温度（Te）的平均精度优于使用低通滤波器（<20 MHz）或不使用任何滤波器所获得的温度精度。
