Electromagnetic pulses produced by expanding laser-produced Au plasma

Abstract

Abstract. 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 outfl ow 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 × 10 16 W/cm 2 . 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.

Low-noise time-resolved optical sensing of electromagnetic pulses from petawatt laser-matter interactions

“…The primary mechanism responsible for generating such high electromagnetic fields in a laser-plasma interaction is typically attributed to ejection of a large flux of energetic ‘hot’ electrons from the plasma followed by a transient ‘slow’ electron return current through the target mount to re-establish quasi-neutrality in the plasma 10, 11, 13, 21 . EMP can be extremely problematic in high-power laser experiments, as EMP signals lasting for hundreds of nanoseconds often adversely affect nearby electronic systems, possibly resulting in loss of data or even permanent damage to high-value equipment.…”

Electro-optic analysis of the influence of target geometry on electromagnetic pulses generated by petawatt laser-matter interactions

“…Intense electromagnetic pulses (EMP) are often observed alongside high-intensity laser-matter interactions [1][2][3][4][5][6][7][8][9], such as those studied in petawatt-class laser facilities [10]. These transient radiofrequency (RF) fields can be problematic for experiments due to their coupling to electronic devices in the immediate vicinity, with the potential to damage valuable equipment or result in data losses from electronic diagnostics, such as CCD cameras.…”

Multi probes measurements at the PALS Facility Research Centre during high intense laser pulse interactions with various target materials

“…The charged particles moving inside the target chamber produce the Lenard-Wiechert potentials with radiative and nonradiative electric and magnetic fields depending on their both velocity and acceleration [21][22][23][24]. The generated EMP is a transient pulse lasting hundreds nanoseconds which is much longer than EPJ Web of Conferences 167, 03009 (2018) https://doi.org/10.1051/epjconf/201816703009 PPLA 2017 laser pulse target interaction [25][26][27][28]. The frequencies range from MHz to tens GHz.…”