パルスパワー放電による高エネルギー密度プラズマ生成・計測の研究動向

概要

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Recent progress in high-energy-density physics (HEDP) phenomena generated by pulsed-power discharge has been introduced. To measure properties of warm dense matter (WDM), which is one of the topic in HEDP, we have reviewed the concept of scheme based on pulsed-power discharge. To generate a well-defined warm dense state for evaluating electrical conductivity by using pulsed-power discharge, an isochoric heating of foamed metal has been proposed, where isochoric heating can be achieved by surrounding the foamed metal with a rigid-walled sapphire capillary. The electrical conductivity observed agrees with previous experiments and predictions. For understanding properties of ablated dense tungsten, we have proposed a semi-empirical evaluation of thermal conductivity based on the Wiedemann-Franz law. The results indicate that the thermal conductivity derived from the electrical conductivity ranges from 0.1 to 100WK-1m-1 depending on the density at temperature of 5000K.