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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 6: Plasma Accelerators, Ions II
AKBP 6.1: Topical Talk
Dienstag, 10. März 2026, 11:00–11:30, SCH/A117
Efficient high energy and high-repetition-rate proton acceleration from cryogenic hydrogen foil targets — •Stefan Assenbaum1,2, Martin Rehwald1, Paweł Ordyna1,2, Joshua Schilz1,2, Maximilian Müller1,2, Thomas Streil1,2, Julian Garreis1,2, Thomas Kluge1, Sebastian Göde3, Maxence Gauthier4, Christopher Schönwälder4, Ulrich Schramm1,2, and Karl Zeil1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2TU Dresden, Dresden, Germany — 3European XFEL, Schenefeld, Germany — 4Stanford Linear Accelerator Center, Menlo Park, CA, USA
Laser plasma-based ion accelerators have not yet reached their full potential in producing high radiation doses at high particle energies, mainly due to the lack of a suitable high-repetition-rate targets that also provide adequate control of the plasma conditions. Cryogenic, solid hydrogen jet targets are being developed to fill this gap, as they combine many favourable properties for studying advanced laser ion acceleration regimes, such as low solid density, single ion species composition and ease of probing in experiments, with repetition-rated operation capability by being self-replenishing and debris-free. In a recent experiment, a new foil-like geometry of this cryogenic hydrogen target is used to accelerate proton bunches at 1 Hz repetition rate. Using the Draco PW laser at reduced laser energy, we report stable, continuous acceleration of ion beams over thousands of consecutive shots. Despite the low laser energy of only 1.6 J, we observe maximum proton energies of up to 50 MeV, indicating outstanding acceleration efficiency.
Keywords: Laser Ion acceleration; Cryogenic Targets; Solid Hydrogen; High Repetition Rate; High efficiency