  Muon beam-induced plasma loading of radio-frequency (RF) cavities filled with
high pressure hydrogen gas with 1% dry air dopant has been studied via
numerical simulations. The electromagnetic code SPACE, that resolves relevant
atomic physics processes, including ionization by the muon beam, electron
attachment to dopant molecules, and electron-ion and ion-ion recombination, has
been used. Simulations studies have been performed in the range of parameters
typical for practical muon cooling channels.
