Working group summary: Machine design for the μ+−μ− collider

Abstract

We summarize the discussions of the working group on Machine Design. The scope of the working group included the entire accelerator system from beam cooling to the collider and the collider ring itself. Particular topics that were discussed in some detail included acceleration options, magnet designs (including the accelerator arcs and collider ring), instabilities, particularly in the collider ring, and lattice issues, particularly in the interaction regions (IRs). Considerable challenges remain in defining a complete machine design for the collider.