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Design study of the electron beamline, and the beam optimization for the AWAKE RUN 2 experiment at CERN

Demonstration of the electron acceleration through the proton beam-driven plasma wakefield has been successfully done by the AWAKE RUN 1 experiment. Moreover, next AWAKE experiment is scheduled. Main goal of the AWAKE RUN 2 experiment is to achieve the capturing efficiency and the energy gain over 90%, and 10 GeV. In order to accomplish the goal, beam size, and its length have to be less than 50 μm, and 100 fs rms, respectively. Since the conventional beamline cannot meet the AWAKE RUN 2 requirements, we are focusing on designing new type of the electron beamline. In this paper, we present simulation results of the beam size, and the bunch length along the new beamline.