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Combustion, Explosion and Shock Waves

2020 year, number 4

Study of Shock-Compressed Argon Plasma using Microwave Diagnostics

E. N. Bogdanov, M. V. Zhernokletov, G. A. Kozlov, A. V. Rodionov
All-Russian Research Institute of Experimental Physics, Sarov, 607188 Russia
Keywords: аргон, неидеальная плазма, микроволновая диагностика, argon, collisional plasma, microwave diagnostics

Abstract

A microwave diagnostics method and radio interferometers with wavelengths of 3.2 and 2.1 mm are used to study the kinematic and electrophysical characteristics of shock-compressed argon plasma, which is initially at atmospheric pressure. This research study is carried out at pressures of 12 ÷ 56 MPa, shock wave velocities of 3.1 ÷ 6.2 km/s, temperatures 9 000 ÷ 19 000 K, and densities 0.006 ÷ 0.012 g/cm3 for powers of Coulomb nonideality from 10-4 to 0.2. The data obtained on the shock-wave compressibility of argon are consistent with the known measurement results and calculations using the modified Van der Waals model and the chemical plasma model. A set of values of the reflection coefficient of electromagnetic radiation from the shock wave front at wavelengths of 3.2 and 2.1 mm is obtained, which serves as a basis for estimating the conductivity and electron concentration behind the shock wave front. The experimental data are consistent with calculation results in a wave velocity range of 3.1 ÷ 3.6 km/s. It is established that with a further increase in the velocity has no effect on the reflection coefficient.