Design study demonstrates compact FFA transport line feasibility for laser-plasma accelerated electrons, highlighting new dispersion management strategies for compact light sources.
A transport line for laser-plasma accelerated electrons is proposed based on the Fixed Field Alternating Gradient (FFA) concept. To accommodate the large LPA energy spread and match the beam to a transverse gradient undulator (TGU), the lattice incorporates matching cells with high-temperature superconducting quadrupoles providing gradients of up to 220 T/m, along with a compact FFA dispersion creator. This configuration allows strong focusing and dispersion tailoring within a compact geometry. The study represents an initial step toward demonstrating the feasibility of FFA-based dispersion management for LPA-driven light sources, while outlining the requirements of further optimization.
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Fatehi et al. (2026) studied this question.
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