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The effect of a proton or carbon anode plasma on the pinched electron beam present in a self magnetic pinch (SMP) diode has been investigated using the Large Scale Plasma (LSP*) code. The resultant plasma generated by the fragmentation of desorbed material is described together with the simulation parameters used. The probability distributions of radial charge, macro particle energy and macro particle velocity of the electron beam are described as a function of emission region and position across the A-K gap. The conclusions of this investigation are that the presence of the anode plasmas change both the impedance of the diode as well as the quantitative evolution of the electron beam. The energy and average electron angle of the electron beam are presented and the interaction with the plasma-front discussed.