Magnetic field generation from a coil-shaped foil by a laser-triggered hot-electron current

Abstract

A strong electron current triggered by a femtosecond relativistically intense laser pulse in a foil coillike target is shown to be able to generate a solenoidal-type extremely strong magnetic field. The magnetic field lifetime sufficiently exceeds the laser pulse duration and is defined mainly by the target properties. The process of the magnetic field generation was studied with 3D PIC simulations. It is demonstrated that the pulse and the target parameters allow controlling the field strength and duration. The scheme studied is of great importance for laser-based magnetization technologies.

Neural network analysis of quasistationary magnetic fields in microcoils driven by short laser pulses

“…When a short laser pulse interacts with an extended target, a short discharge pulse induced by the interaction propagates along the target 15 almost with the speed of light. To reach a quasi-stationary regime with short laser pulses, reduction of the target perimeter down to the values less than the laser pulse length was proposed earlier 16 – 18 . A reduced size of the coil in OMFG makes the effective magnetized volume quite small, so the principal question addressed here is whether the target with the coil perimeter longer than the pulse length may produce a quasi-stationary magnetic field.…”

Machine Learning Analysis of Quasi-Stationary Magnetic Fields Optically-Driven by Short Laser Pulses

“…When a short laser pulse interacts with an extended target, a short discharge pulse induced by the interaction propagates along the target [15] almost with the speed of light. To reach a quasi-stationary regime with short laser pulses, reduction of the target perimeter so it becomes less than the laser pulse length was proposed [16,17,18]. A reduced size of the coil in OMFG makes the effective magnetized volume quite small, so the principal question addressed here is whether the target with the coil perimeter longer than the pulse duration may produce a quasi-stationary magnetic field.…”

Kilotesla plasmoid formation by a trapped relativistic laser beam

“…For shorter pulses, in order to obtain a homogeneous and quasistatic magnetic field, the target size needs to be reduced. By miniaturization of targets it is possible to maintain the condition κ 1 even for few-tens fs laser pulses [17]. In the scheme detailed below, based on the micro-cavity "snail" targets, the parameter κ ∼ 0.5 corresponds to an oscillatory regime of the laser-induced discharge.…”