An Engineering Prototype of a Late Stage Ionization Cooling Cell for a Muon Collider

Achieving the low emittances required for a muon collider requires ionization cooling.Much of that cooling occurs in compact cooling cells where superconducting coils and conventional RF cavities are closely interleaved.The real challenges for these cooling cells reside in their engineering challenges: high field solenoids, RF cavities, and absorbers, often designed near technological limits, placed in close proximity to each other.We thus propose to build a prototype ionization cooling cell to demonstrate the capability of constructing an ionization cooling channel reaching the lowest emittances and to provide engineering input for the design of such beamlines.Ionization Cooling: By alternating absorbers with acceleration, the p⊥ of each particle can be reduced.Proposed 6D Cooling Channel: Rectilinear channel with tilted alternating solenoids and wedge absorbers 6D COOLING CHANNEL OVERVIEW 1.5 CELL PROTOTYPE PLAN • Multi-stage tapered channel; Each stage has a lower equilibrium emittance • This is achieved by decreasing the beta function for each stage by scaling the cell dimensions and increasing the on-axis field