A dynamic dispersion insert in the Fermilab Main Injector for momentum collimation

Abstract

The Fermilab Main Injector (MI) accelerator is designed as a FODO lattice with zero dispersion straight sections. A scheme will be presented that can dynamically alter the dispersion of one of the long straight sections to create a non-zero dispersion straight section suitable for momentum collimation. During the process of slip stacking DC beam is generated which is lost during the first few milliseconds of the ramp. A stationary massive primary collimator/absorber with optional secondary masks could be utilized to isolate beam loss due to uncaptured beam. MAIN INJECTOR LATTICE Ring LatticeThe MI is 3.3 km in circumference and was designed as a pure FODO lattice with eight dispersion free straight sections of either 3, 4, or 8 half-cells in length.