Abstract
This paper shows how electromagnetic pulses mitigation is performed on the LMJ-PETAL laser facility. In particular, the authors show mitigation suppression for joint shots with appropriate time delay between the LMJ nanosecond beams and the PETAL picosecond beam.
Highlights
Laser MegaJoule (LMJ)-Petawatt Aquitaine Laser (PETAL) [1] is a large-scale laser facility which combines high-energy nanosecond laser beams and a high-power picosecond beam
As part of the PETAL project, we have studied the Electromagnetic pulses (EMP) generation mechanisms in order to predict their impact on the diagnostics and security equipment at the LMJ-PETAL facility
A LMJ-PETAL target holder has been designed by numerical simulations and validated in short-pulse laser experiments with energy up to 400 J
Summary
LMJ-PETAL [1] is a large-scale laser facility which combines high-energy nanosecond laser beams and a high-power picosecond beam. The interaction of a petawatt-class laser pulses with solid targets produces intense electromagnetic fields (EMP) [5,6,7,8], which may exceed 1 MV/m, leading to equipment failures, diagnostics damage, and spurious signals in detectors. As part of the PETAL project, we have studied the EMP generation mechanisms in order to predict their impact on the diagnostics and security equipment at the LMJ-PETAL facility. A target charging model [9,10,11] explains the process of EMP generation in short-pulse laser-plasma experiments by the discharge current neutralizing the charge accumulated on the target on a ns timescale. An intense laser pulse focused on the target surface creates energetic electrons that partially escape and leave a positive charge on the target. The core of the simulation chain is the SOPHIE code [12], a three-dimensional, particle-in-cell (PIC) code, which solves in a self-consistent manner Maxwell equations for the electromagnetic field and dynamic equations for the relativistic charged particles in the vacuum chamber with appropriate boundary conditions
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