Wuppertal 2015 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 5: Poster

AKBP 5.6: Poster

Tuesday, March 10, 2015, 11:00–19:00, Foyer Ebene G.10

Controlling the transverse electron beam quality in plasma wakefield accelerators — •Jan-Hendrik Erbe, Charlotte Palmer, Matthew Streeter, Olena Kononenko, Timon Mehrling, Tobias Kleinwächter, and Jens Osterhoff — Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Deutschland

Plasma-based accelerators (PBA) are rapidly gaining interest in the accelerator community for their ability to produce high energy electron beams in a compact design. One unresolved challenge is the capture of accelerated beams for transport via conventional beam optics. PBA beams intrinsically have a high divergence ∼1mrad and a large energy spread ∼1-10%. This leads to temporal elongation of the electron bunch and a growth of the initially low emittance ∼ µm inside the plasma during the vacuum drift following the plasma target. Tailoring the particle density profile at the transition from plasma into vacuum is a promising method by which the divergence can be decreased, thus improving the beam quality after a drift. To show the feasibility of analytically calculated density ramps in a plasma target computational fluid dynamics (CFD) simulations are performed. Numerical studies and particle-in-cell simulations employing the results from the CFD simulations show a promising mitigation of the divergence. The designed plasma targets will be produced and tested in a laser driven wakefield acceleration experiment.