Design of a γt-jump system for Fermilab Main Injector

In order to control the beam emittance and reduce the particle losses during the transition crossing at high intensity, a conceptual design of a γt-jump system for the FNAL Main Injector is presented. It is a first-order system employing local dispersion inserts at existing dispersion free straight sections. The goal is to provide a jump of Δγ_t from +1 to -1 within 0.5 ms. The system consists of 8 sets of pulsed quadrupole triplets. These quads have pole tips of hyperbolic shape and thin laminations. The power supply uses a GTO as the fast switch and a resonant circuit with a 1 kHz resonant frequency. The elliptical beam tube is made of Inconel 718, which has high electrical resistivity and high strength. Details of the lattice layout and subsystems design are presented