EMMA, design and commissioning of a non-scaling FFAG

by Bruno Muratori (Cockcroft Institute, Daresbury, UK)

Thursday 7 Oct 2010, 14:15 → 16:00 Europe/Zurich

30/7-018 - Kjell Johnsen Auditorium (CERN)

EMMA (Electron Machine with Many Applications) is a prototype non-scaling electron FFAG hosted at Daresbury Laboratory. NS-FFAGs related to EMMA have an unprecedented potential for medical accelerators for carbon and proton hadron therapy. It also represents a possible active element for an ADSR (Accelerator Driven Sub-critical Reactor). This talk will summarize the design of the injection and extraction transfer lines of the NS-FFAG as well as the septa and kickers used to inject into the EMMA ring and the EMMA ring itself. Finally, a short description of the latest commissioning progress shall also be given. In order to operate EMMA, the ALICE energy recovery linac prototype shall be used as injector and the energy will range from 10 to 20 MeV. Because this is the first non-scaling FFAG, it is important that as many of the bunch properties are studied as feasible, both at injection and at extraction. To do this, an injection line was designed consisting of a dogleg to extract the beam from ALICE, a matching section, a tomography section and some additional dipoles and quadrupoles to transport the beam to the entrance of EMMA. In parallel with injection a future dedicated extraction / diagnostic line is also discussed. We shall also describe the mechanical and magnet challenges of the injection and extraction regions, in particular the septa and kickers.

Slides EMMA_bm.pdf