Extended Data Fig. 5: Electron beam transport.
From: Seeded free-electron laser driven by a compact laser plasma accelerator
a, b, COXINEL beamline lattice for chromatic matching in horizontal (a) and vertical (b) planes, with electron beam sizes (solid lines) and normalized emittances (dashed lines) for different energies. c, d, e, Electron beam phase-space at undulator entrance (c), middle (d) and exit (e). g-n, Electron beam longitudinal properties at source point (black lines) and entrance of undulator (blue lines). Transport calculation with ELEGANT and BETA using following beam parameters at source point: Ee=188.8 MeV, charge Q=100 pC, σz=2 μm–RMS, normalized emittance ϵx,y=(1.5;1.0) mm.mrad, divergence \({\sigma }_{x^{\prime} ,y^{\prime} }\)=(1.5;1.0) mrad–RMS, σe = 5%–RMS, with QUAPEVA 2 strength detuned by -2% and R56=-1.8 mm.
