Muon Cooling Rings Lattices composed of dipoles and

Dipole-only cooling ring The closed orbits are all similar so the ring has large

Small ring for cooling demonstration MC Workshop BNL 07 3

Racetrack ring Arcs have 360 deg phase, dispersion is zero in straight sections. Absorbers

Features of the S-configuration Allows easy injection and extraction. Can be tapered as the

Simulation with ICOOL • Runs to date with initial cold beams show that the

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Muon Cooling Rings Lattices composed of dipoles and solenoids A. Garren, H. Kirk, D. Cline, Y. Fukui, and K. Lee Muon Collider Workshop, BNL MC Workshop BNL 07 Dec. 3 -7, 2007

Dipole-only cooling ring The closed orbits are all similar so the ring has large momentum acceptance. MC Workshop BNL 07 Scaling 0 -gradient wedge dipole rings have been studied. They show good cooling potential. We wish to build on these by adding straight sections and solenoids in a racetrack configuration. Solenoids between the magnets increase the focusing to make each arc achromatic. The result is that the straight sections have zero dispersion. Such a ring can be easily changed into an S-shaped open configuration. 2

Small ring for cooling demonstration MC Workshop BNL 07 3

Racetrack ring Arcs have 360 deg phase, dispersion is zero in straight sections. Absorbers in arcs, RF and injection in straight sections. MC Workshop BNL 07 4

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Features of the S-configuration Allows easy injection and extraction. Can be tapered as the beam is cooled. MC Workshop BNL 07 8

Simulation with ICOOL • Runs to date with initial cold beams show that the equilibrium emittances in x, y and z vary predictably with absorber wedge angle. • Beam momentum around 100 Me. V/c looks favorable. • Dynamic aperture needs work. MC Workshop BNL 07 9

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