1.5 GeV/c Multiturn Shaving Extraction and Its Transport Line for the Brookhaven AGS

A system for fast shaving extraction at 1.5 GeV/c is implemented to extract the circulating beam in five turns. A numerical simulation is first carried out to determine the emittance and the rf structure of the extracted beam. This is followed by several machine study sessions which establish the optimal extraction configuration, confirm the emittance, and modify the transport line for low energy beam. Finally, a one-week run for the "Neutrino Oscillation" experiment demonstrates that the system is very stable and capable of delivering 7.5 0× 1012 p/sec with 70% extraction efficiency and 95% transport efficiency.