Experimental Studies On Kα Radiation Produced By Hot Electrons During The Interaction Of Ultra-short And Ultra-intense Laser Pulse With Plasmas

During the interaction of ultra-short and ultra-intense laser pulse with plasmas, high energy electrons will be produced near to critical-density surface. When the hot electrons knocked out inner-shell electrons of the cold material, Kα characteristic lines emission will be created. Kα emission is closely correlated with the hot electrons' action. From Kα lines emission, we can find some useful information of hot electron, such as its production and transport in overdense plasmas. On the other hand, such Kα emission has widely potential applications, especially for chatacteristic pulse light source, owing to its compactness and high fluence. For the motivation referred above, we carried out the experimental studies on the Kα characteristic lines emssion with the multi-layers targets irradiated by US-UI laser.To begin with, the model and significance of the fast ignition were briefly introduced. Secondly, the basic theory was expatiated, including the process of the interaction of US-UI laser with plasma; the production and accleration mechanisms of hot electrons;the relativistic electron kinetic theory and the propagation of hot electrons' current. At last, the methods used to detect hot electrons' action were presented.The single-photon counting CCD was used to detect Kα emission. We carried out the energy calibration experiment using several standard X-ray sources in National Institute of Metrologe of China. The...