Beam injection into emma non-Scaling FFAG

Non-Scaling FFAG has unique characteristics of large transverse acceptance and rapid beam acceleration with a relatively small beam excursion for a fixed field accelerator, and broad range of application is expected. To demonstrate the feasibility as a practical accelerator, construction of a test machine called EMMA is proposed. The project is planned to build a Non-Scaling FFAG which accelerate an electron beam from 10MeV to 20MeV. As the nature of a test machine, the injection and extraction scheme must accommodate large varieties of conditions. Due to the nature of the accelerator, that is the betatron tune changes drastically changes during beam acceleration, the requirements enforces a different approach in the design of injection system compared to the conventional circular accelerators, and make it challenging. In the paper, the injection scheme of EMMA non-scaling FFAG is described.