  We briefly describe the basic physics principles considered for planning of
the AWAKE Run 2 experiment. These principles are based on experimental results
obtained during Run 1 and knowledge obtained from numerical simulation results
and other experiments. The goal of Run 2 is to accelerate an electron bunch
with a narrow relative energy spread and an emittance sufficiently low for
applications. The experiment will use two plasmas, electron bunch seeding for
the SM process, on-axis external injection of an electron bunch and electron
bunch parameters to reach plasma blow-out, beam loading and beam matching.
