Magnets for Muon 6D Helical Cooling Channels

The Helical Cooling Channel (HCC), a new technique for six-dimensional (6D) cooling of muon beams, has shown considerable promise based on analytic and simulation studies. The implementation of this revolutionary method of muon cooling, using a continuous absorber inside superconducting magnets, requires high-field superconducting magnets that provide superimposed solenoidal, helical dipole, and helical quadrupole fields. This project will develop novel magnet design concepts to provide HCC magnet systems with the desired fields for 6D muon beam cooling. The new designs will feature simple coil configurations that produce the required complex fields, using new high field conductor materials. In addition to developing designs and construction methods for these magnets, a complete magnet system for a six-dimensional muon beam cooling channel will be designed. Phase I will develop a conceptual design of the magnets for a 6D muon cooling demonstration experiment, including the 4m-long cooling section and upstream and downstream emittance matching magnets, in preparation for a detailed engineering design. Commercial Applications and other Benefits as described by the awardee: Magnets that can enable bright muon beams would have many applications, ranging from scientific accelerators and storage rings to beams for the study of material properties and new sources of energy. Examples of these applications include energy frontier muon colliders, Higgs and neutrino factories, studies of rare fundamental interactions, and muon catalyzed fusion.