Measuring Energy Evolution of Electrons in Plasma Accelerators

A team of researchers from DESY has used a noninvasive technique to measure the energy evolution of electron bunches inside helium laser-plasma accelerators, providing new insights into the fundamental mechanisms of this next-generation accelerator technology. By splitting the laser beam and using an X-ray detector to measure the energy of Thomson-scattered photons, the team was able to reconstruct the energy evolution of the electrons over most of the accelerator length without disturbing the particles or the process. This new measurement method offers direct insight into the plasma acceleration process and could help to improve it. Turning the concept of wakefield acceleration into a practical device, on the other hand, is a major challenge.

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