Isochoric heating of foamed metal using pulsed power discharge as a making technique of warm dense matter

Abstract

To generate well-defined warm dense state for evaluating electrical conductivity by using pulsed-power discharge, we have proposed an isochoric heating of foamed metal. Isochoric heating can be achieved by surrounding the foamed metal with a rigid-walled sapphire capillary. We evaluate the temperature and electrical conductivity of the foam∕plasma based on the line-pair method of the foam∕plasma emission and on the voltage-current waveforms. The electrical conductivity observed agrees with previous experiments and predictions. Thus, the proposed technique yields the electrical conductivity of warm dense matter with a well-defined temperature.

Evaluation of Transport Properties in Warm Dense Matter Generated by Pulsed-power Discharge for Nuclear Fusion Systems

“…The experimental layout is the same as that in previously published studies using pulsed-isochoric heating confined to a sapphire vessel [36]. Pulsed-isochoric heating is driven by low inductance capacitors (6 × 2 μF) with 15 kV of charged voltage, which is estimated to be enough for vaporizating of a sample.…”

Warm dense matter study and pulsed-power developments for X-pinch equipment in Nagaoka University of Technology

“…We have proposed a method to generate WDM that requires the well-defined density-temperature conditions of WDM [17,22]. The detail of a experimental equipment has been described in Ref.…”

“…The detail of a experimental equipment has been described in Ref. [17]. The significant feature of experimental equipment for generating WDM is easy to observe the DC electrical conductivity.…”

“…To understand the WDM physics, several experimental and theoretical approaches have been demonstrated [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. To make a warm dense state, ultra-short pulse lasers, pulsed-power discharges, and intense heavy ion beams have been conventionally used.…”

“…In this paper, we report on the several WDM studies in Nagaoka University of Technology. An isochoric heating of foamed material by using pulsed-power discharges could generate the well-defined density-temperature of warm dense matter [17]. To observe the interior of WDM generated by …”