  The Horizon 2020 Project EuPRAXIA (European Plasma Research Accelerator with
eXcellence In Applications) is preparing a conceptual design for a highly
compact and cost-effective European facility with multi-GeV electron beams
using plasma as the acceleration medium. The design includes two user areas:
one for FEL science and one for High Energy Physics (HEP) detector development
and other pilot applications. The accelerator facility will be based on a laser
and/or a beam driven plasma acceleration approach. This contribution introduces
layout considerations of the future plasma accelerator facilities in the
context of EuPRAXIA. It compares conventional and novel plasma accelerator
facility requirements and presents potential layouts for the future site.
Together with performance analysis, cost effectiveness, and targeted user cases
of the individual configurations, such layout studies will later enable a
ranking of potential configurations. Based on this information the optimal
combination of technologies will be defined for the 2019 conceptual design
report of the EuPRAXIA facility.
