A comparison between the results of x-ray absorption spectroscopy of runaway electrons (RAEs) generated during nanosecond timescale high-voltage (HV) gas discharge and the simulated attenuation of the x-ray flux produced by the runaway electron spectrum calculated using particle-in-cell numerical modeling of such a type of discharge is presented. The particle-in-cell simulation considered the field and explosive emissions (EEs) of the electrons from the cathode. It is shown that the field emission is the dominant emission mechanism for the short-duration (< 2.5 ns) high-voltage pulses, while for the long-duration (5> ns) high-voltage pulses, the explosive emission is likely to play a significant role.
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This work was supported in part by a fellowship from the Lady Davis Foundation and the Technion Grant No. 2013371.
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