NEW RESULTS FROM THE EMMA EXPERIMENT

EMMA (Electron Model for Many Applications) is a prototype non-scaling electron FFAG operating at Dares- bury Laboratory. After demonstrating serpentine channel acceleration and fast resonance crossing in 2011, studies continue of the beam dynamics to explore the large trans- verse and longitudinal acceptance, the detailed effects of integer tune crossing at slow acceleration rates, compari- son of measurements to detailed field measurements, and the experimental mapping of the machine by relating the initial and final phase space coordinates. These recent re- sults are reported in this paper, together with more prac- tical improvements such as injection orbit matching with real-time monitoring of the bunch coordinates in transverse phase space.