Abstract
The flute instability in mirror machines is driven byspatial charge accumulation and the resulting E × B plasma drift. Onthe other hand, E × B drift due to external electrodes or coils can beused as a stabilizing feedback mechanism. Fast photography is used tovisualize Hydrogen plasma in a small mirror machine and infer the plasmadrift and the internal electric field distribution. Using incompressibleflow and monotonic decay assumptions we obtain components of the velocityfield from the temporal evolution of the plasma cross section. The electricfield perpendicular to the density gradient is then deduced from E=-V × B. With this technique we analyzed the electric field of fluteperturbations and the field induced by electrodes immersed in the plasma.
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