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Electromagnetic pulses produced by expanding laser - produced Au plasma

De Marco M., Cikhardt J., Krása J., Velyhan A., Pfeifer M., Krouský E., Klír D., Řezáč D., Limpouch J., Margarone D., Ullschmied J.

Nukleonika

2015

Vol. 60, No. 2

239--243

The interaction of an intense laser pulse with a solid target produces large number of fast free electrons. This emission gives rise to two distinct sources of the electromagnetic pulse (EMP): the pulsed return current through the holder of the target and the out flow of electrons into the vacuum. A relation between the characteristics of laser-produced plasma, the target return current and the EMP emission are presented in the case of a massive Au target irradiated with the intensity of up to 3 × 1016 W/cm2. The emission of the EMP was recorded using a 12 cm diameter Moebius loop antennas, and the target return current was measured using a new type of inductive target probe (T-probe). The simultaneous use of the inductive target probe and the Moebius loop antenna represents a new useful way of diagnosing the laser–matter interaction, which was employed to distinguish between laser-generated ion sources driven by low and high contrast laser pulses.