Advanced cooling scheme with gas filled rf cavities and discrete absorbers

A fast cooling technique is described that simultaneously reduces all six phase-space dimensions of a muon beam. In this process, cooling is accomplished by reducing the beam momentum through ionization energy loss in wedge absorbers and replenishing the momentum loss only in the longitudinal direction by using gas-filled rf cavities. With the aid of numerical simulations we show that the transmission is comparable to that of an equivalent channel with vacuum rf cavities. Furthermore, the final emittances achieved satisfy the cooling criteria for a Muon Collider. Finally, we discuss the sensitivity in performance for various gas pressures.