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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 4: New Accelerator Concepts and Hadron Accelerators

AKBP 4.5: Vortrag

Dienstag, 16. März 2021, 17:30–17:45, AKBPa

Staging Laser and Plasma Wakefield Accelerators for low emittance electron generation — •Moritz Foerster for the Hybrid Collaboration collaboration — LMU München

Low emittance relativistic electron bunches are of crucial importance for the generation of high brilliance x-ray light. This light is needed in medical imaging to achieve the best trade-off between image quality, acceptable radiation dose, compactness and affordable coasts. However, there is little technology available to bridge the regime between conventional x-ray tubes and large-scale synchrotrons/free electron lasers.

Plasma Wakefield Acceleration (PWFA) can generate low emittance electrons. However, PWFA typically requires large scale particle accelerators like linacs or synchrotron machines to generate the particle driver. Laser Wakefield Acceleration (LWFA) on the other hand is widely available in many university scale labs but often suffers from higher emittance of the electron bunches created.

Here we describe a novel approach using a staged laser driven electron accelerator to produce the low emittance electrons needed. Nanocoulomb class electron bunches at a few hundred MeV energy are produced via LWFA. Thereafter those electrons drive a second PWFA stage a few millimetres downstream.

First experimental results show injection and acceleration in the second stage. These first proof of principle results pave the way to actual emittance optimisation necessary for making the source interesting for actual applications.