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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 6: New Accelerator Concepts - Models and Experiments
AKBP 6.7: Vortrag
Dienstag, 19. März 2024, 12:30–12:45, E 020
Visualizing Plasmons and Ultrafast Kinetic Instabilities in Laser-Driven Solids using X-ray Scattering — •Paweł Ordyna1,2, Ulrich Schramm1,2, Thomas Cowan1,2, and Thomas Kluge1 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2Technical University Dresden
Ultra-intense lasers that ionize and accelerate electrons in solids to near the speed of light can lead to kinetic instabilities that alter the laser absorption and subsequent electron transport, isochoric heating, and ion acceleration. These instabilities can be difficult to characterize, but a novel approach using X-ray scattering at keV photon energies allows for their visualization with femtosecond temporal resolution on the few nanometer mesoscale.
The scattering signal can be predicted from Particle-in-cell simulations. We present here combined experimental and synthetic results from laser-driven flat silicon membranes that show development of periodic structures in the plasma electron density. Our Particle-in-cell simulations confirm that the observed signals are due to an oblique two-stream filamentation instability.
These findings provide new insight into ultra-fast instability and heating processes in solids under extreme conditions at the nanometer level with possible implications for laser particle acceleration, inertial confinement fusion, and laboratory astrophysics.
Keywords: SAXS; X-ray; plasma; laser-acceleration