Magnetohydrodynamics of a Pulsed Mercury Jet Entering a Solenoid at an Angle

Figure 1 gives an overview of the configuration for production of pions by a proton beam impinging on a long, thin target, followed by capture of low-momentum, forward pions in a channel of solenoid magnets with rf cavities to compress the bunch energy while letting the bunch length grow, thus rotating the bunch in phase space. This configuration was conceived for a muon collider [2, 3] with a 4-MW proton beam, and is similar to that being considered for a neutrino factory based on a muon storage ring [4, 5].