9. Annual MT Meeting

Reduction of the electron beam divergence of laser wakefield-accelerators by integrated plasma lenses

Not scheduled

2h 30m

Gaede Lecture Hall (Bldg 30.22) (Karlsruhe Institute of Technology (KIT))

Poster without speed talk Accelerator Research and Development Poster session

Speaker

Yen-Yu Chang (Helmholtz Zentrum Dresden Rossendorf)

Description

We report on electron beam collimation using a passive plasma lens, integrated directly and conveniently into a laser wakefield accelerator stage operating in the high charge regime. The lens is created by reshaping the gas density profile of a super-sonic jet at the beam’s exit side through an obstacle mounted above the jet. It reduces the beam’s divergence by a factor of two to below 1 mrad (root-mean-square), while preserving the total charge of 170 pC and maintaining the energy spread. The resulting spectral-charge density, here defined as the charge per energy bandwidth and emission angle, of up to 7 pC/(MeVmrad) played a key role in the recent experimental demonstration of free-electron lasing. The presented simple and robust gas shaping technique holds the potential to generate specific density profiles, essential for the application of adiabatic focusing or staging of accelerators.