The most challenging issue to realize an accelerator for an Accelerator Driven Sub-critical Reactor system (ADSR) is the handling of high intensity beam - more than 1 mA. For such an application, FFAG is one of most promising candidates. To take advantage of the FFAG as a high intensity accelerator, efficient injection/extraction and acceleration schemes are crucially important. One approach to achieve a high intensity FFAG is to eliminate the kicker magnet from the injection and extraction process and also to implement multi-bunch acceleration.
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