Darmstadt 2016 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 15: PWA and self modulation

AKBP 15.5: Talk

Thursday, March 17, 2016, 17:30–17:45, S1/05 24

Emittance conservation through tailored plasma ramps in PWFA scenarios — •Alexander Aschikhin, Alberto Martinez de la Ossa, Timon Mehrling, and Jens Osterhoff — Deutsches Elektronen-Synchrotron, Notkestraße 85, 22607 Hamburg, Germany

The FLASHForward facility will offer unique capabilities or plasma-wakefield acceleration experiments. It uses high-quality beams from the FLASH accelerator to excite plasma wakefields for the exploration and improvement of novel and existing injection mechanisms.

The unique nature of the plasma environment creates several challenges with regard to the conservation of the beam quality, partially due to the strong focusing fields present in the blowout region following a driver beam in the highly nonlinear regime. The beta function of a beam needs to be matched into the wakefield in order to avoid severe growth of the beam emittance - a crucial quality parameter for beam transport, staging and applications.

Since the matched beta function is usually at least an order of magnitude lower than easily accessible for conventional accelerator optics, multiple schemes have been proposed to mitigate severe emittance growth by tailoring the plasma profile to adiabatically reduce the beta function to match the plasma wakefield.

We will focus on an introduction of these techniques, before presenting initial results from numerical and theoretical analyses for the typical FLASH beam parameter space.