Ionization Cooling of Muon Beams
Paul Lebrun, Fermilab
Intense neutrino sources based on high energy muon beams are currently
study. The front-end of this new accelerator complex requires a cooling
section, where the transverse emittance of the low momentum (200 MeV/c)
beam gets reduced by a factor ~4. Due to the short lifetime of
the muons, and
the large incoming emittance, ionization cooling appears to be the
feasible option. A muon cooling channel is therefore based on
the use of liquid
hydrogen absorbers and short linacs embedded in solenoidal lattice.
Computer simulations play an essential role at the design stage. This
requires a multi-disciplinary approach: we borrowed heavily from High
Physics codes, and constructed two separate codes: ICOOL and DPGeant.
latter is the old Geant3 code, upgraded to double precision.
based on the PATH code is being pursued at CERN. At Fermilab,
we are currently
using the new Geant4, a relatively new C++ package for particle physics
simulation. After a brief introduction of muon ionization cooling,two
designs will be presented and the essence of these computer codes along
with the"learned lessons" will be discussed.