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New results obtained in experiments on laser irradiation (I = 5 × 1013 W/cm2, λ = 1.054 µm) of low-density (2–10 mg/cm3) porous materials (agar, triacetate cellulose, and foam polysterene) are presented and discussed from the standpoint of optimum porous material utilization in target designs for inertial confinement fusion. The influence of low-density material microstructure of irradiated samples on the absorption of laser radiation and the energy transfer processes was investigated using X-ray and optical diagnostic methods with high temporal and spatial resolution.
The experience of target fabrication with low-density and cluster
heterogeneity is presented. Cluster plasma research is strongly dependent
on target fabrication development and target structure characterization.
Ten more target parameters should be measured for experiment interpreting
in case of micro-heterogeneous plasma. Foam and foil targets, high-Z doped
also, are produced and irradiated on the existing laser facilities. The
density of 4.5 mg/cc cellulose triacetate in the form of regular
three-dimensional polymer networks are achieved which is as low as plasma
critical density for the third harmonic of iodine laser light. The
possibilities of varying important target parameters, methods of their
monitoring are discussed. Experiments with underdense foam targets with or
without clusters irradiated on Prague Asterix Laser System (PALS) laser
facility are analyzed preliminary for target optimization. Under-critical
foams of varying structure (closed-cell foam or three-dimensional
networks) and densities are reported for plasma experiments. Thermal and
radiation transport in such targets are considered.
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