Title :
Statistical Interpretation of the Density Fluctuations From the High-Speed Visible Images of Edge Turbulence on QUEST
Author :
Banerjee, Santanu ; Zushi, H. ; Nishino, N. ; Hanada, K. ; Liu, H.Q. ; Ishiguro, M. ; Ryoukai, T. ; Tashima, S. ; Nakamura, K. ; Idei, H. ; Hasegawa, M. ; Fujisawa, A.
Author_Institution :
Interdiscipl. Grad. Sch. of Eng. Sci., Kyushu Univ., Fukuoka, Japan
Abstract :
Edge turbulence has been imaged on QUEST at high temporal resolution (50 kHz) using a fast framing visible camera. Statistical features of fluctuations including blobs are investigated in both open and closed magnetic configurations. Higher order moments of fluctuations including blobs and their mutual relationships are investigated. Close resemblance of the density pdf with Gaussian or beta distributions has earlier been predicted. Hence, an attempt has been made to characterize the density pdf with respect to the Pearson system to ascertain the implications of the stochastic forces.
Keywords :
Gaussian distribution; high-speed optical techniques; plasma density; plasma diagnostics; plasma fluctuations; plasma magnetohydrodynamics; plasma transport processes; plasma turbulence; Gaussian distribution; Pearson system; QUEST; beta distribution; blobs; closed magnetic configurations; density fluctuations; edge turbulence; frequency 50 kHz; high-speed visible images; high-temporal resolution; statistical interpretation; stochastic forces; Cameras; Image edge detection; Magnetic resonance imaging; Plasmas; Slabs; Toroidal magnetic fields; High-speed camera; plasma diagnostics; plasma transport processes; statistical analysis;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2011.2163423
