The experimental and numerical data on electrical explosion of X-pinch are analyzed to develop the understanding of
physical phenomena, which leads to generation of short, high intensive X-ray pulse. Main attention is given to MHD
cumulative processes that are reasonable for creation of point-like regions of a non-equilibrium compressed plasma with
high temperatures. The investigation based on the model of formation and development of hot plasma in the region of X-
pinch neck. The model bases on the analysis of cumulative MHD compression of X-pinch neck and takes into account a
radial compression of plasma by the magnetic field, outlet of plasma on axis, two-temperature processes of electron-ion
relaxation, Joule heating, electron and ion viscous friction and dissipation. The radiation transfer is described by the dif-
fusion approach in the axial direction and as the vacuum losses of radiation on radius. The lifetime of hot plasma is de-
termined by a break of the neck in the result of generation of axial shock waves. The model of the scaling laws for hot
spot plasma parameters and X-ray burst is described. One obtained that the duration of X-ray pulse is about several pico-
seconds, the scale of spark region size is no large than one micron, and the X-ray pulse intensity is about 1017 W/cm2.
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