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Modern particle accelerators and their applications increasingly rely onprecisely coordinated interactions of intense charged particle and laser beams.Femtosecond-scale synchronization alongside micrometre-scale spatial precisionare essential e.g. for pump-probe experiments, seeding and diagnostics ofadvanced light sources and for plasma-based accelerators. State-of-the-arttemporal or spatial diagnostics typically operate with low-intensity beams toavoid material damage at high intensity. As such, we present a plasma-basedapproach, which allows measurement of both temporal and spatial overlap ofhigh-intensity beams directly at their interaction point. It exploitsamplification of plasma afterglow arising from the passage of an electron beamthrough a laser-generated plasma filament. The corresponding photon yieldcarries the spatiotemporal signature of the femtosecond-scale dynamics, yet canbe observed as a visible light signal on microsecond-millimetre scales.

Plasma-photonic spatiotemporal synchronization of relativistic electron and laser beams