Drive-Witness acceleration scheme based on corrugated dielectric mm-scale capillary.

Two bunches were accelerated up to 8 MeV in a 3.6 cell S-band RF gun. The RF gun introduced time – energy correlation, producing a drive and a witness of slightly different energies. When the beam was dispersed by the bending magnet different time slices were projected to different transverse coordinates on the Yttrium Aluminium Garnet screen.

Capillary structures:

CCD images of the beam on the YAG screen for a reference measurement (beam without capillary) and a measurement for an off-central beam propagation in the corrugated capillary.

A measurement of acceleration and deceleration of the witness bunch in the flat and corrugated capillaries as a function of the bunch-to-bunch distance.

-- KonstantinLekomtsev1 - 05 Jul 2017