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Statistical Analysis of the Spatial Behavior of Plasma Blobs Around the Plasma Column in a Linear Plasma Device
Author(s) -
Tanaka H.,
Ohno N.,
Tsuji Y.,
Okazaki K.,
Kajita S.
Publication year - 2012
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201210027
Subject(s) - plasma , trajectory , physics , azimuth , range (aeronautics) , rotation (mathematics) , brownian motion , position (finance) , column (typography) , spiral (railway) , computational physics , optics , geometry , materials science , mathematical analysis , mathematics , nuclear physics , finance , quantum mechanics , astronomy , connection (principal bundle) , economics , composite material
A new statistical analysis technique is applied to the spatial behavior of coherent plasma structures around the plasma column in the linear plasma device NAGDIS‐II. The two‐dimensional behavior of visible light emission is measured using a fast‐imaging camera, and the movie data shows that spiral shaped structures appear intermittently and rotate around the plasma column. The ejection position of the structures in the azimuthal direction is detected and then analyzed. To extract detailed statistics in the spatial domain, the effect of the global rotation is removed. By reconstructing the trajectory of a structure over a 360° range and using rescaled range (R/S) analysis, it is found that the trajectory is similar to a Brownian motion superimposed upon the global rotation. This result indicates that the process of generation of these structures is influenced by previous ejection events (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)