  Based on the CMS Upgrade R&D Proposal RD10.02, we describe the motivation and
main features of the CMS GEM Project for LS2 and propose the addition of a full
GE1/12 detector station comprising Gas Electron Multiplier (GEM) chambers to
the forward muon system of CMS. The limitations of the currently existing
forward muon detector when operating at increasingly high luminosity expected
after LS1 are laid out followed by a brief description of the anticipated
performance improvements achievable with a GE1/1 station. The second part
describes the detector system followed by an overview of electronics and
associated services including a discussion of the schedule and cost of the
project. Plans for a precursor demonstrator installation in LS1 are presented.
This proposal is intended as a concise follow-up of the detailed document
CMS-IN-2012-023. If approved, this is to be followed by a detailed Technical
Design Report.
