From cold dusty plasmas to hot microplasmas “dust”

This work concerns some new aspects of dusty plasmas physics-high power density microplasmas “dust”. The authors study the behaviour of hot microplasmas collected (T~1 keV and n_e~10 ¹⁹-10²¹ cm^-3) on the background of rather cold dilute plasmas. Their prime goal is to formulate optimal ways for the simple experimental production and study of hot microplasmas ensemble created by an intense energy deposition into the cold solid density dust “target”. Absorbing (stopping) power of correlated media of dust grains (clusters) with very small volumes and near solid densities may be essentially higher compared to both plasma (gas) and solid planer laser targets (estimated maximum energy densities deposited anomalously may be up to ~10⁸ J/cm³ at ns time scale). Scattering and merging of hot microplasmas are considered. The preliminary data on suprathermal X-ray emission (under real merging of hot microplasmas) and ejection of multi-keV energetic ions under fast overheating of solid density grains are presented also