Investigation of plasma edge turbulence using a gas-puff imaging system in the reversed-field pinch device TPE-RX

R. Cavazzana, G. Serianni, P. Scarin, M. Agostini, N. Vianello, Y. Yagi, H. Koguchi, S. Kiyama, H. Sakakita, Y. Hirano

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Abstract

An investigation of the edge region in a large reversed-field pinch (RFP) device has been undertaken for the first time using a high time resolution gas-puff imaging (GPI) system, applied to the TPE-RX experiment. The GPI diagnostic is aimed at the investigation of turbulence in the edge region under the severe heat flux conditions of thermonuclear fusion-grade plasmas, where conventional electrostatic probes cannot be used. To compare the data obtained by the GPI during low power experiments, a retractable array of electrostatic probes has been added. The whole diagnostic system provided high quality measurements of fluctuations with fine spatial and temporal resolution, as well as radial profiles of relevant plasma parameters. The measurements confirm several important properties of plasma edge already found in other experiments, like the presence of a strong ExB shear layer and the 'intermittent' behaviour of the measured quantities, which display non-Gaussian fluctuation spikes at different time scales. Along with the conventional power spectra and correlation analyses, the application of continuous wavelet transform techniques to GPI data allowed a detailed description of the spatial structure and of the propagation of these localized 'intermittent events'. © 2007 IOP Publishing Ltd.
Original languageEnglish
Article number004
Pages (from-to)129 - 143
Number of pages15
JournalPlasma Physics and Controlled Fusion
Volume49
Issue number2
DOIs
Publication statusPublished - 1 Feb 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Cavazzana, R., Serianni, G., Scarin, P., Agostini, M., Vianello, N., Yagi, Y., ... Hirano, Y. (2007). Investigation of plasma edge turbulence using a gas-puff imaging system in the reversed-field pinch device TPE-RX. Plasma Physics and Controlled Fusion, 49(2), 129 - 143. [004]. https://doi.org/10.1088/0741-3335/49/2/004