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We present results of an experiment where two independent Laser-Plasma-Accelerator (LPA) stages are coupled at a short distance by a plasma mirror. Stable electron beams were focused by a discharge capillary-based active plasma lens [2] to a 10-micron-level beam size in a Hydrogen plasma, such that they interact with a dark-current-free, quasi-linear wakefield excited by the laser of the second stage. Changing the arrival time of the electron beam with respect to the second stage laser pulse allowed reconstruction of the temporal field structure and determination of the plasma density. Injection into the wakefield of the second stage was verified by a 100 MeV energy gain of the electron beam.
© 2016 Optical Society of America
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