Fig. 1. Schematic diagram of boundary conditions in computational domain

Fig. 2. Plasma sheath motion process in DPF

Fig. 3. Simulation of the axial motion of the plasma sheath at the top of the anode, compared with the motion of the plasma sheath captured by LLNL^[11]

Fig. 4. Effect of pressure on axial velocity of sheath

Fig. 5. Influence of different current amplitudes on axial velocity of sheath, pinch time and compression ratio

Fig. 6. Effect of anode radius on axial velocity of sheath

Fig. 7. Effect of anode radius on pinch time and compression ratio

Fig. 8. Time of plasma layer reaching the top of anode under different cathode-anode gaps