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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 13: Novel Accelerators II
AKBP 13.4: Vortrag
Donnerstag, 12. März 2026, 12:15–12:30, SCH/A117
Characterization of kinetic instabilities in high-intensity, short-pulse, laser-driven solid-density plasmas — •Jannis Schulz — TU Dresden — HZDR
We present a study of instabilities in plasmas generated by the interaction of electron beams accelerated by intense femtosecond laser pulses with dense solid targets. At intensities exceeding 1018 W/cm2, the beam-plasma system develops collective processes that strongly influence energy and particle transport. As an overarching framework, the analysis of linear stability properties is used to systematically describe the emergence and evolution of characteristic structures. The main emphasis lies on transverse filamentation instabilities, in particular the collisional-resistive regime, whose growth is strongly affected by electrical conductivity and current distribution. In addition, longitudinal processes such as the two-stream instability are examined, arising from counter-propagating electron populations. The classification relies on analytically derived dispersion relations, which allow the comparison of growth rates and wavelengths with numerical simulations and latest experiments performed at LCLS and EuropeanXFEL. The objective is to clarify the mechanisms that drive the development of these instabilities, connect them to the structures observed in the simulations, and ultimately connect them to the underlying plasma conditions (e.g. beam and background densities and effective temperatures).
Keywords: Filamentation instabilities; Collisional-resistive regime; Two-stream instability; Dispersion relations; Beam-plasma interaction