Project X and a muon facility at Fermilab

An integrated program is described, starting with muon experiments in the Booster era, continuing with a 2 MW target station, a 4 GeV Neutrino Factory and a 3 TeV Muon Collider, all driven by Project X. This idea provides an integrated approach to the Intensity and Energy Frontiers at Fermilab. Project X is a proposed high intensity proton facility intended to support a world-leading program in neutrino and flavor physics over the next two decades at Fermilab while also providing an upgrade path to drive a neutrino factory and/or a muon collider. Project X is an integral part of the Fermilab Roadmap as described in the Fermilab Steering Group Report of August 2007 and of the Intensity Frontier science program described in the P5 report of May 2008. The primary elements of that research program to be supported by Project X include: (1) A neutrino beam for long baseline neutrino oscillation experiments. A new 2 megawatt proton source with proton energies between 50 and 120 GeV would produce intense neutrino beams, directed toward a large detector located in a distant underground laboratory. (2) Kaon and muon based precision experiments running simultaneously with the neutrino program. These could include a world leading muon-to-electron conversion experiment and world leading rare kaon decay experiments. (3) A path toward a muon source for a possible future neutrino factory and, potentially, a muon collider at the Energy Frontier. This path requires that the new proton source have significant upgrade potential beyond the initial uses. This paper suggests that an implementation of Project X based on a CW linac can be part of a continuous synergistic transition from a muon physics program in the 'Booster era' to the Neutrino Factory and Muon Collider. It then describes a possible staging of the planned muon experiments and of Project X to provide a graceful transition from the Intensity Frontier to the Energy Frontier