A. Antognini, N. J. Ayres, I. Belosevic, V. Bondar, A. Eggenberger, M. Hildebrandt, R. Iwai, D. M. Kaplan, K. S. Khaw, K. Kirch, A. Knecht, A. Papa, C. Petitjean, T. J. Phillips, F. M. Piegsa, N. Ritjoho, A. Stoykov, D. Taqqu, and G. Wichmann (muCool Collaboration)
Phys. Rev. Lett. 125, 164802 – Published 15 October 2020

An important step towards a high brightness, low energy, muon beam is achieved by compressing a positive muon beam from a vertical spread of 10 mm to 0.7 mm within a few microseconds.
— Read on journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.164802