Statistical modeling of deconvolution procedures for improving the resolution of measuring electron temperature profiles in tokamak plasmas by Thomson scattering lidar

Tanja N. Dreischuh; Ljuan L. Gurdev; Dimitar V. Stoyanov

doi:10.1117/12.885881

17 January 2011 Statistical modeling of deconvolution procedures for improving the resolution of measuring electron temperature profiles in tokamak plasmas by Thomson scattering lidar

Tanja N. Dreischuh, Ljuan L. Gurdev, Dimitar V. Stoyanov

Author Affiliations +

Proceedings Volume 7747, 16th International School on Quantum Electronics: Laser Physics and Applications; 77470T (2011) https://doi.org/10.1117/12.885881
Event: XVI International School on Quantum Electronics: Laser Physics and Applications, 2010, Nessebar, Bulgaria

Abstract

The potentialities are investigated, by statistical modeling, of deconvolution techniques for high-resolution restoration of electron temperature profiles in fusion plasma reactors like Joint European Torus (JET) measured by Thomson scattering lidar using the center-of-mass wavelength approach. The sensing laser pulse shape and the receiving-system response function are assumed to be exponentially-shaped. The plasma light background influence is taken into account as well as the Poisson fluctuations of the photoelectron number after the photocathode enhanced in the process of cascade multiplying in the employed microchannel photomultiplier tube. It is shown that the Fourier-deconvolution of the measured long-pulse (lidar-response-convolved) lidar profiles, at relatively high and low signal-to-noise ratios, ensures a higher accuracy of recovering the electron temperature profiles with three times higher range resolution compared to the case without deconvolution. The final resolution scale is determined by the width of the window of an optimum monotone sharp-cutoff digital noise-suppressing (noise-controlling) filter applied to the measured lidar profiles.

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Tanja N. Dreischuh, Ljuan L. Gurdev, and Dimitar V. Stoyanov "Statistical modeling of deconvolution procedures for improving the resolution of measuring electron temperature profiles in tokamak plasmas by Thomson scattering lidar", Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 77470T (17 January 2011); https://doi.org/10.1117/12.885881

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