Tomography as a promising diagnostic tool for plasma turbulence
Tomography as a promising diagnostic tool for plasma turbulence
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DOI：
10.1088/0741-3335/58/2/025005
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发表时间：
2016-02-01
影响因子：
2.2
通讯作者：
Shimizu, A.
中科院分区：
文献类型：
--
作者：
Fujisawa, A.;Nagashima, Y.;Shimizu, A.
为了在高温环形等离子体中应用湍流层析成像技术，以圆柱形等离子体为原型，研制了一套等离子体湍流层析成像系统。本文介绍了诊断系统的软、硬件两个方面，并报告了第一个结果的层析重建，可以成功地产生本地发射及其波动。在重建过程中，用10台PC机并行处理120个芯，在每1 μ s的采样时间内获得了约0.6ms的等离子体二维图像。结果包括用快速傅立叶变换对局域涨落功率谱进行稳态分析，用小波变换对涨落功率谱的时间行为进行分析，以及对局域等离子体发射的结构变形或模式进行分析，表明层析成像作为一种有前途的等离子体湍流诊断工具是成功的。
A system for plasma turbulence tomography has been developed in a linear cylindrical plasma as a prototype with aiming at future application on toroidal plasma of higher temperature. This paper describes the diagnostic system in both aspects of the soft- and hardware, and reports the first results of tomographic reconstruction that can successfully produce local emission and its fluctuations. In the reconstruction process, two dimensional view of plasma is obtained for approximately 0.6 ms in every sampling time of 1 mu s using parallel processing of 120 cores with 10 personal computers. The results include the steady state analysis of local fluctuation power spectra using fast Fourier transform, analysis of temporal behavior of fluctuation power spectra with wavelet transform, and analyses of the structural deformation or pattern of local plasma emission, demonstrating that the success of tomography as a promising diagnostic tool for plasma turbulence.