Tomography as a promising diagnostic tool for plasma turbulence

作者：Fujisawa A^*; Nagashima Y; Inagaki S; Onchi T; Ohshima S; Shimizu A

来源：Plasma Physics and Controlled Fusion, 2016, 58(2): 025005.

DOI：10.1088/0741-3335/58/2/025005

• tomography
• linear cylindrical plasma
• multi-color detection
• diagnostics for plasma turbulence

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.

• 出版日期2016-2