Abstract

Delay in detecting the position and boundaries of the plasma confined by a tokamak increases plasma instability and decreases the accuracy of plasma control in tokamak. In this article, two techniques called ‘‘periodogram’’ and ‘‘cross-spectral analysis’’ are used to provide a quantitative approach for computing the time delay between data received by two diversity coils from one source (plasma fluctuations) in IR-T1 tokamak. To analysis the achieved data after performing the Fourier transform on the data, the periodogram, square-coherency and spectrum phase diagram of the data were plotted in terms of frequency at three different time intervals. In the time interval, \(29000<t<3000\) \(\mu\)s, when the plasma current is almost constant, the average phase shift between the \(\omega\)-frequencies components of the data was obtained by using the phase-spectrum analysis. At the frequency of the highest coherency the time delay (\(\tau_{d}=1.831\) \(\mu\)s) between the data of the Rogowski and Mirnov coils was calculated by considering the average phase shift between them.

中文翻译：

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互谱法测量托卡马克电磁诊断线圈之间的时延

摘要

检测由托卡马克限制的血浆的位置和边界的延迟会增加血浆的不稳定性，并降低托卡马克中血浆控制的准确性。在本文中，两种技术被称为“周期图”和“互谱分析”，以提供一种定量方法来计算两个分集线圈从一个红外源（等离子体波动）接收到的两个分集线圈接收到的数据之间的时间延迟。 T1托卡马克。为了对数据执行傅里叶变换后分析获得的数据，在三个不同时间间隔按频率绘制了数据的周期图，平方相干和频谱相位图。在时间间隔\（29000 <t <3000 \） \（\ mu \） s中，当等离子电流几乎恒定时，\（\ omega \）之间的平均相移数据的低频分量是通过使用相位频谱分析获得的。在最高相干性的频率下，通过考虑它们之间的平均相移来计算Rogowski和Mirnov线圈的数据之间的时间延迟（\（\ tau_ {d} = 1.831 \） \（\ mu \） s）。