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In the Phase 2 of the AWAKE first experimental run (from May to November2018), an electron beam was used to probe and test proton-driven wakefieldacceleration in a rubidium plasma column. In this work, we analyze the overallcharge capture and shot-to-shot reproducibility of the proton-driven plasmawakefield accelerator with various electron bunch injection parameters. Thewitness electron bunches were produced using an RF-gun equipped with a Cs2Tephotocathode illuminated by a tailorable ultrafast deep ultraviolet (UV) laserpulse. The construction of the UV beam optical system enabled appropriatetransverse beam shaping and control of its pulse duration, size, and positionon the photocathode, as well as time delay with respect to the ionizing laserpulse that seeds the plasma wakefields in the proton bunches. Variablephotocathode illumination provided the required flexibility to produce electronbunches with variable charge, emittance, and injection trajectory into theplasma column. We demonstrate charge capture rates exceeding 15% (40 pC of GeVaccelerated charge for a 385 pC injected electron bunch) under optimizedelectron injection conditions.

Mapping charge capture and acceleration in a plasma wakefield of a proton bunch using variable emittance electron beam injection