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A six-dimensional muon ionization cooling in a helical magnet channel hasbeen studied. The cooling performance which is analytically evaluated bysolving the exact Hamiltonian is reproduced in numerical simulation. One of thekey beam elements for the helical channel is a dense-hydrogen gas-filled RFcavity which realizes a compact cooling channel. Besides, a beam-induced gasplasma in the cavity can generate a plasma-focusing effect. This will generateextremely small betatron function, which realizes extremely low emittance beam.

Helical Six-Dimensional Muon Ionization Cooling Channel with Gas-Filled RF Cavities