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TY - UNPB AU - Steinke, S. ED - Yamazaki, Yoshishige ED - Facco, Alberto ED - McCausey, Amy ED - Schaa, Volker RW TI - Staging of Laser-Plasma Electron Accelerators J2 - Proc. of LINAC2016, East Lansing, MI, USA, 25-30 September 2016 C1 - East Lansing, MI, USA T2 - Linear Accelerator Conference T3 - 28 LA - english AB - We present results of an experiment where two Laser-Plasma-Accelerator stages are coupled at a short distance, as is needed to increase energy while preserving average gradient. Stable electron beams produced by the first stage were focused by a discharge capillary-based active plasma lens, through a plasma mirror which coupled a second independent laser, into the second stage. The electron beam interacted with a dark-current-free, quasi-linear wakefield excited by the second stage laser. Changing the arrival time of the electron beam allowed localized reconstruction of the temporal field structure excited by the wake and determination of the on-axis plasma density. Staged acceleration in the wakefield of the second stage was verified by a momentum gain of the electron beam. The results indicate that limits to plasma accelerator energy gain can be overcome using staged acceleration, which provides a path to collider-relevant energies. Such compact staging is also important to photon sources where it can be used to decelerate electrons after photon production to mitigate shielding needs. PB - JACoW CP - Geneva, Switzerland ER -