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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 12: Novel Accelerators I

AKBP 12.3: Vortrag

Donnerstag, 12. März 2026, 10:15–10:30, SCH/A117

all-optical In-plasma multi-staging of Laser-Wakefield Accelerators using density tailoring — •Xingjian Hui, Alberto Martinez de la ossa, Alexander Sinn, Ángel Ferran pousa, Rob Shalloo, and Maxence Thévenet — DESY, Hamburg, Germany

The staging of laser-driven plasma accelerators (LPAs) could open up energy frontiers, but achieving in- and out-coupling of laser pulses while preserving beam quality remains a challenge. In this work, we present an all-optical, in-plasma staging scheme that uses refraction in a transverse plasma density gradient to couple the incoming laser into the next LPA stage, eliminating the need for mirrors and magnets. This design can in principle support significant ion motion without substantial emittance degradation, making it well-suited for a broad energy range. With realistic 3D simulations using the quasistatic particle-in-cell code HiPACE++ on GPU, we observe 98% capture efficiency and 15+3+3 GeV energy gain per within 3 stages with emittance preserved and proper bean loading, driven by a ~20J for first stage and ~10 J laser pulse for followings guided by a hydrodynamic optical-field-ionized (HOFI) channel of matched spot size 30 microns. These results represent a significant step toward practical multistage plasma acceleration, paving the way for the generation of ultra-high-energy electron beams for a wide range of scientific and technological applications.

Keywords: Laser-plasma Accelerator; Staging; Particle-in-cell