Suprathermal hard X-rays and energetic particles from plasmas "dust"

This work concerns some novel aspects of the simple production of high powe r density matter in vacuum discharges [1,2] and related energy transport We study the ensembles of cord grains - hot microplasmas created by an intens e energy deposition into the cold solid density, low volume dust "target" c ollected in the interelectrode space (clusters, grains, microparticles of d ifferent size from anode material). Some effects of the high local power de nsity were realised to allow production of the different ensembles of cold grains with fraction of hot microplasmas (T similar to 1 KeV and n similar to 10(20)-10(22) Cm-3). Th, hard x-ray yield registered and well reproduced in the vacuum discharges (just at similar to J of energy stored) is about 0.1 - 0.3%. Time of flight measurements show that hard x-ray production may be accompanied by energetic ions (similar to 0.1 -1 MeV) like those for ir radiated clusters [3]. Thermal and suprathermal levels of x-ray emission, l aser-like behaviour of potentially amplifying media of plasmas "dust" as we ll as x-ray trapping are discussed. The last phenomenon suggests a partial "random walk" of photons inside of x-ray "ball" due to the regulated level of multiple scattering and reflecting in disordered media of cold and hot " grains" of any sizes (x-ray "random" laser [4,5]). Single pass ASE [6] regi me of x-ray lasing as particular case of x-ray yield is considered also.