Anode plasma expansion in pinch-reflex diodes

Anode plasma expansion in PRD is investigated using a one-dimensional magnetohydrodynamic model. Early in time, the plasma undergoes thermal expansion and its front is slowed down due to jxB. After the current has reached its maximum and for small radius where j and B are larger, jxB may accelerate the bulk of the anode plasma to large velocities. Good qualitative agreement is obtained with the experimental observations of the time dependence of the plasma velocity as well as its radial profile. The maximum expansion velocities reach tens of cm/μsec