Performances of the Alpha-X RF gun on the PHIL accelerator at LAL

Vinatier, T.
Bruni, C.
Roux, R.
Brossard, J.
Chancé, S.
Cayla, J.N.
Chaumat, V.
Xu, G.
Monard, H.

Open link

Publication date

January 2015

DOI

10.1016/j.nima.2015.06.055

Publisher

Elsevier BV

Abstract

International audienceThe Alpha-X RF-gun was designed to produce an ultra-short (<100 fs rms), 100 pC and 6.3 MeV electron beam with a normalized rms transverse emittance of 1π mm mrad for a gun peak accelerating field of 100 MV/m. Such beams will be required by the Alpha-X project, which aims to study a laser-driven plasma accelerator with a short wavelength accelerating medium. It has been demonstrated on PHIL (Photo-Injector at LAL) that the coaxial RF coupling, chosen to preserve the gun field cylindrical symmetry, is perfectly understood and allows reaching the required peak accelerating field of 100 MV/m giving beam energy of 6.3 MeV. Moreover, a quite low beam rms relative energy spread of 0.15% at 3.8 MeV has been measured, complete...