An Exploding Wire-Compression Method for Evaluating the Electrical Conductivity of Diamond-Like Carbon in a Warm Dense State

• Published in: IEEE transactions on plasma science Vol. 47; no. 2; pp. 1477 - 1481
• Main Authors: Sasaki, Toru, Ohuchi, Takumi, Watabe, Arata, Sugimoto, Satoshi, Takahashi, Kazumasa, Kikuchi, Takashi, Koga, Mayuko, Fujioka, Shinsuke
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Absorption spectroscopy; Carbon; Compression tests; Computational fluid dynamics; Computer simulation; Conductivity; Diamond-like carbon; Diamond-like carbon (DLC); Diamonds; Discharges (electric); Electric potential; Electric wire; Electrical resistivity; Exploding wires; Explosive compacting; fast ignition; Fluid flow; Gold; Magnetohydrodynamic simulation; Plasmas; pulsed-power discharges; Resistance; warm dense matter (WDM); Wavelength division multiplexing; Wires
• ISSN: 0093-3813; 1939-9375
• DOI: 10.1109/TPS.2018.2890594

We have employed an exploding-wire compression method to measure the electrical conductivity of diamond-like carbon (DLC) in a warm dense matter (WDM) state. We generated a DLC in the WDM state using shock compression driven by an exploding-wire discharge within a rigid capillary. To elucidate the generation of DLC in WDM, we performed a 1-D magnetohydrodynamic simulation. Using the numerical results, we estimated the electrical conductivity of the DLC plasma. By comparing the time-evolutions of the voltage and current for gold and gold + DLC samples, we demonstrated that the voltage-current evolution is different in the two cases. From the absorption spectroscopy, we estimated the DLC temperature to be 8000-9000 K. By comparing the results of the experiment with those of the numerical simulation, we determined the electrical conductivity of the DLC plasma to be 10 6 S/m. This is relatively high compared with the electrical conductivity of the conventional carbon plasma, but the experimental results are similar to the theoretical values for diamond at solid density.