Abstract
Experiments trace variations in the energy of a laser-plasma electron beam to properties of the drive laser, establishing a technique for stabilizing compact next-generation sources of high-energy electrons.
Highlights
Relativistic, high-brightness electron beams are an essential tool for fundamental and life-science research
We provide a parametrization to predict the electron energy drift with subpercent accuracy for many hours from measured laser parameters, which opens a path for performance improvements by active stabilization
The analysis presented above was based on the rolling average of measured laser parameters and successfully predicted the electron energy drift over a 6-h time window
Summary
High-brightness electron beams are an essential tool for fundamental and life-science research. In a LPA, the interaction of an intense laser pulse with a plasma creates a trailing cavity, a plasma wave, which traps and accelerates electrons from the plasma background [2]. This cavity supports electric fields several orders of magnitude higher than in a modern RF accelerator, which reduces the distance required to generate gigaelectron-volt-level electron beams from kilometers to centimeters [3,4,5,6].
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