Determination of Plasma Parameters as well as Electrons Distribution Function

In this research we determined the biasing effects on the plasma electrons distribution function and plasma displacement in a low beta, large aspect ratio and circular cross section tokamak. For this purpose, a movable biasing system was designed, constructed, and installed, and then the positive voltage applied to an electrode inserted inside the tokamak limiter and the plasma current, particle distribution function and also the plasma horizontal displacement in the absence and presence of the biasing based on the multipole moments technique were measured. Measurements result has shown a modification of plasma confinement by decreasing the plasma displacement.