We summarize and explain the realization of witness particle injection into wakefields for the AWAKE experiment. In AWAKE, the plasma wakefields are driven by a self-modulating relativistic proton bunch. To demonstrate that these wakefields can accelerate charged particles, we inject a \unit[10-20]{MeV} electron bunch produced by a photo-injector. We summarize the experimental challenges of this injection process and present our plans for the near future.
@article{arxiv.1810.04202,
title = {External Electron Injection for the AWAKE Experiment},
author = {Marlene Turner and Chiara Bracco and Spencer Gessner and Brennan Goddard and Edda Gschwendtner and Patric Muggli and Felipe Pena Asmus and Francesco Velotti and Livio Verra},
journal= {arXiv preprint arXiv:1810.04202},
year = {2018}
}