• J.C. Gallardo, J.S. Berg, R.C. Fernow, H.G. Kirk, R. Palmer
  BNL, Upton, Long Island, New York
• D.V. Neuffer
  Fermilab, Batavia, Illinois
• K. Paul
  Muons, Inc, Batavia

As part of the APS Joint Study on the Future of Neutrino Physics* we have carried out detailed studies of the Neutrino Factory front-end. A major goal of the new study was to achieve equal performance to our earlier feasibility studies** at reduced cost. The optimal channel design is described in this paper. New innovations included an adiabatic buncher for phase rotation and a simplified cooling channel with LiH absorbers. The linear channel is 295 m long and produces 0.17 muons per proton on target into the assumed accelerator transverse acceptance of 30 mm and longitudinal acceptance of 150 mm.

*APS Multi-Divisional Study of the Physics of Neutrinos, http://www.aps.org/neutrino/. **S.Ozaki, R.B.Palmer, M.Zisman and J.C.Gallardo, edts., Tech. Rep., BNL-52623 (2001), http://www.cap.bnl.gov/mumu/studyii/FS2-report.html.

• H.G. Kirk, S.A. Kahn, H. Ludewig, R. Palmer, V. Samulyak, N. Simos, T. Tsang
  BNL, Upton, Long Island, New York
• J.R.J. Bennett
  CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
• T.W. Bradshaw, P. Drumm, T.R. Edgecock, Y. Ivanyushenkov
  CCLRC/RAL, Chilton, Didcot, Oxon
• I. Efthymiopoulos, A. Fabich, H. Haseroth, F. Haug, J. Lettry
  CERN, Geneva
• T.A. Gabriel, V.B. Graves, J.R. Haines, P.T. Spampinato
  ORNL, Oak Ridge, Tennessee
• Y. Hayato, K. Yoshimura
  KEK, Ibaraki
• K.T. McDonald
  PU, Princeton, New Jersey

We describe an experiment designed as a proof-of-principle test for a target system capable of converting a 4 MW proton beam into a high-intensity muon beam suitable for incorporation into either a neutrino factory complex or a muon collider. The target system is based on exposing a free mercury jet to an intense proton beam in the presence of a high strength solenoidal field.