Speaker
Description
Bunch compressors are frequently employed to boost beam brightness in accelerator facilities such as e+e-
linear colliders and free electron lasers (FELs). However, the energy chirp or correlated energy spread intro-
duced into the beam by the chirper linac remained after bunch compression is undesirable in some applica-
tions. Wakefield structures known as dechirpers are designed to manipulate electron distribution
in longitudinal phase space to remove the associated energy spread of the compressed bunches. In this re-
port, we present our studies by using planar dielectric-lined waveguide (DLW) as a compact and effective
dechirper for removing of drive beam energy chirp in NSRRC EUV FEL facility and the development of a sys-
tematic approach to obtain an appropriate wake function for simulation of multi-particle dynamics from the
wake potentials of a general structure calculated by commercially available codes-CST. The wake function of
dechirper extracted by proposed process was consistent with analytic wake function. This wake function of
dechirper combined with ELEGANT or ImpactT shown the 45keV/m of energy spread will be removed after
the operation of round DLW dechirper.
