The general scheme of the experiment, including alumina discharge tube, electromechanical shutter, and pin-hole camera arrangement. The example of the image of the shock wave structure is inserted (44 ns-54 ns from the start of the discharge current, preionization off).
The time profile of the main discharge current.
The scheme of the preionization circuit and time profile of the preionization current. The arrow marks the start of the main discharge.
The radial emission distribution in the discharge tube: (A) preionization off, (B) preionization on. The procedures of the measurement of the shock wave front position Xf and the front width ΔXf are illustrated. The time gates of each frame are shown in the graph. The position of the “dark space” behind the front of the shock wave is marked.
Time dependencies of the shock wave front positions. (A) Initial pressure of Ar is 80 Pa, (B) initial pressure of Ar is 320 Pa.
Pressure dependence of the shock wave front velocity.
Time dependencies of the shock wave front widths. (A) Initial pressure of Ar is 80 Pa, (B) initial pressure of Ar is 320 Pa.
The VUV spectra of the hot plasma after the moment of cumulation. (A) Preionization on (70 ns–105 ns after the start of the main discharge current), (B) preionization off (120 ns–155 ns).
The shock wave front velocities.
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