Abstract
The particle transport coefficients were investigated in ac plasmas by density modulation method on HT-7 tokamak. It is observed that the particle diffusion coefficient ( D) is almost the same in various cases and varies with the electron density. The convection velocity ( V) is equal to the value of inward pinch velocity ( V E × B ) for low and high density discharges. The particle confinement time becomes much higher when the directions of plasma current and toroidal field are uniform.
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