Abstract
We use Letokhov’s concept of stochastic feedback to interpret experiments on X-ray spontaneous emission from a polydisperse plasma of a nanosecond vacuum discharge (NVD) with a virtual cathode. We develop a diffusion model of stochastic propagation of spontaneous X-ray radiation in the volume of randomly located reflecting clusters. The model provides qualitative explanation of both the experimentally observed effects of partial “trapping” and high-intensity bursts of X-ray quanta. The X-ray burst regime is a result of the photon density accumulation which, due to diffusion inside the inter-electrode volume, exceeds the losses from the surface, while the trapping regime corresponds to the slow developing diffusion, which characteristic time is larger than the discharge duration.
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