Simulation of cygnus rod-pinch diode using radiographic chain model

Radiographic chain model is used to self-consistently model the diode with a two-dimensional particle-in-cell code (Merlin) which links to an electron-photon Monte Carlo transport code (MCNP) and obtain the spectrum under three different situations. These are: steady state spectrum using a voltage pulse of 2.5 MV; time integrated spectrum using an experimental voltage pulse; inclusion of reflexing electrons at the anode in our particle-in-cell simulation. Detailed electron dynamics are obtained in this study. The investigations conclude that the time integrated bremsstrahlung spectrum is significantly softer than that of the steady state. The simulations included reflexing electrons around the tapered and un-tapered rods. The dynamics and impact on the bremsstrahlung spectrum are presented.