Table 1 Experimental parameters.

From: Mapping few-femtosecond slices of ultra-relativistic electron bunches

Parameter Value
Electron beam energy 685 MeV
Peak current 0.62 kA
Seed laser wavelength 266 nm
FEL wavelength 38.1 nm
Active undulator length 6.4 m
Chicane dispersive strength R 56 50 μm
Dimensionless Shear parameter of rf-deflector 13.91 ± 0.22