• H.G. Kirk
  BNL, Upton, Long Island, New York
• J.J. Back
  University of Warwick, Coventry
• C.J. Densham, P. Loveridge
  STFC/RAL, Chilton, Didcot, Oxon
• X.P. Ding
  UCLA, Los Angeles, California
• V.B. Graves
  ORNL, Oak Ridge, Tennessee
• F. Ladeinde, Y. Zhan
  SUNY SB, Stony Brook, New York
• K.T. McDonald
  PU, Princeton, New Jersey

We outline a program of engineering design and simulation for a target station and pion production/capture system for a 4-MW proton beam at the front end of a Muon Collider or a Neutrino Factory. The target system consists of a free liquid-metal (nominally mercury) jet immersed in a high-field solenoid magnet capture system that also incorporates the proton beam dump. Topics to be studied include optimization of proton beam and jet target parameters, of the magnetic configuration for capture and subsequent transport of pions and muons, of the beam dump, of the radiation/thermal shielding of the capture magnets, and of the beam windows.

• X.P. Ding, D.B. Cline
  UCLA, Los Angeles, California
• J.S. Berg, H.G. Kirk
  BNL, Upton, Long Island, New York

A study of a pion production and capture system for a 4MW target station for a neutrino factory or muon collider is presented. Using the MARS code, we simulate the pion production produced by the interaction of a free liquid mercury jet with an intense proton beam. We study the variation of meson production with the direction of the proton beam relative to the target. We also examine the influence on the meson production by the focusing of the proton beam. The energy deposition in the capture system is determined and the shielding required in order to avoid radiation damage is discussed.