Abstract
In the converging field configuration of cylindrical plasma following an ECR plasma source, intermittent variation of floating potential, which is a negative spike with about a ten microsecond duration, is observed. The event is ubiquitous; independent of measurement position and magnetic field. Cross-correlation analysis for two floating potentials at separate positions reveals that a strong correlation exists within the event timescale. The correlation along the magnetic field line suggests an axially elongated structure. The radial extent of the structure is clarified by the radial correlation profile. Different FWHM of the radial profile at the plasma production region and the downstream converging field region is essentially explained by field line tracing.
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