Experimental measurement of thermal and electrical conductivities in warm dense state generated by pulsed-power discharge for efficient energy conversion of fast ignition

We have measured the thermal and electrical conductivities of fusion material in warm dense matter (WDM) region. The method is an isochoric heating using pulsed-power discharge with a ruby capillary. The electrical conductivity is estimated from the shape of WDM and the measured voltage-current waveform. The thermal conductivity is estimated by the thermal conduction measured from the WDM temperature to the ruby capillary temperature using laser-induced fluorescence. The electrical conductivity of gold at the density of 0.01p_s were 4×10⁴ to 9×10⁴S/m with the temperature ranging from 1.5×104 to 8×10⁴ K. The thermal conductivity of tungsten at the density of 0.0 1p_s was 30 to 40 W/m·K with the temperature ranging from 8.0×10³ to 1.2×10⁴ K.