Development of next generation muon beams at the Paul Scherrer Institute

The Paul Scherrer Institute (PSI) provides the world's highest intensity muon beam of $\mathcal{O}(10^{8})\,\mu^{+}/$s at 28$\,$MeV/c. The HiMB project aims to improve this rate by two orders of magnitude. Meanwhile, the muCool collaboration is developing a device which converts a standard surface $\mu^{+}$ beam of cm-size and MeV-energy into a beam of 1$\,$mm-size and 1$\,$eV energy spread by achieving a compression of 6-dimensional phase space by 10 orders of magnitude with an efficiency of $10^{-3}$.