Top arrow pointing up

Resources

Resources

Relativistically transparent magnetic filaments: scaling laws, initial results and prospects for strong-field QED studies

Sep 17, 2021. Publications

Abstract

Relativistic transparency enables volumetric laser interaction with overdense plasmas and direct laser acceleration of electrons to relativistic velocities. The dense electron current generates a magnetic filament with field strength of the order of the laser amplitude (>105 T). The magnetic filament traps the electrons radially, enabling efficient acceleration and conversion of laser energy into MeV photons by electron oscillations in the filament. The use of microstructured targets stabilizes the hosing instabilities associated with relativistically transparent interactions, resulting in robust and repeatable production of this phenomenon. Analytical scaling laws are derived to describe the radiated photon spectrum and energy from the magnetic filament phenomenon in terms of the laser intensity, focal radius, pulse duration, and the plasma density. These scaling laws are compared to 3D particle-in-cell (PIC) simulations, demonstrating agreement over two regimes of focal radius. Preliminary experiments to study this phenomenon at moderate intensity (a0 ∼ 30) were performed on the Texas Petawatt Laser. Experimental signatures of the magnetic filament phenomenon are observed in the electron and photon spectra recorded in a subset of these experiments that is consistent with the experimental design, analytical scaling and 3D PIC simulations. Implications for future experimental campaigns are discussed.

H G Rinderknecht7,1, T Wang, A Laso Garcia, G Bruhaug, M S Wei, H J Quevedo, T Ditmire4, J Williams, A Haid, D Doria, K M Spohr, T Toncian and A Arefiev

© 2021 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft

New Journal of Physics,  Volume 23,  September 2021

doi:10.1088/1367-2630/ac22e7

More From Publications

Aug 5, 2021    Publications

Electron energization during merging of self-magnetized, high-beta, laser-produced plasmas

Journal of Plasma Physics, Volume 87, Issue 4, August 2021, 905870411

Read more

Jun 18, 2021    Publications

Talbot-Lau x-ray deflectometer: Refraction-based HEDP imaging diagnostic

Review of Scientific Instruments 92, 065110 (2021)

Read more

May 14, 2021    Publications

Enhancements in laser-generated hot-electron production via focusing cone targets at short pulse and high contrast

Phys. Rev. E 103, 053207 – Published 14 May 2021

Read more

Oct 8, 2020    Publications

Enhanced spatial resolution of Eljen-204 plastic scintillators for use in rep-rated proton diagnostics

M. J.-E. Manuel et al, Rev. Sci. Instrum. 91, 103301 (2020)

Read more

Sep 17, 2020    Publications

Optimization of radiochromic film stacks to diagnose high-flux laser-accelerated proton beams

Review of Scientific Instruments 91, 093303 (2020)

Read more

May 26, 2020    Publications

Relativistic plasma physics in supercritical fields

Physics of Plasmas 27, 050601 (2020)

Read more