1. Status of KEK 150MeV FFAG M. Aiba (KEK) For KEK FFAG Gr. FFAG’05, 5 to 9 Dec., KURRI

2. Contents Purpose of KEK 150MeV FFAG Machine Parameters Hardware improvements Beam extraction and 100Hz operation Status of accelerator performance Summary

3. Purpose of150MeV FFAG To be a prototype FFAG for various applications Beam extraction from FFAG for the first time Rapid cycling Test experiments for applications using extracted beam

4. Machine parameters

5. Ion source of injector cyclotron Hardware improvement (1) Ion source: DC operation Pulsed operation Cyclotron RF Ion source DC operation Pulsed operation Cyclotron RF Ion source Beam from cyclotron ~200  sec ~10  sec Reduce unavailable beam (injection period of FFAG is few  sec) Increase peak current 3~4times Beam from cyclotron

6. RF system Hardware improvement (2) Enhancement of RF system: RF voltage: ~5kVpp ~12kVpp

7. Drive mechanism for insertions Hardware improvement (3) Attach drive mechanism to injection septum injection bumps extraction kicker extraction septum Extraction Septum Position and angle can be changed while keeping vacuum.

8. Beam extraction Fast extraction with kicker and septum Realize 100% extraction efficiency Top and side drawings of the septum magnet

9. Beam extraction experiment(1) Beam separation with kicker Circulating beam Separated beam with kicker Displacement of beam orbit by kicker (calculation) K icker S eptum O bservation 5mm * Septum field is not included in this calculation.

10. Beam extraction experiment(2) Experiment set up

11. Status of accelerator performance First goal of accelerator development Beam energy: 100MeV Rapid cycling: 100Hz Beam current: 1nA Status, Dec. 2005 Beam energy of100MeV has been achieved. 100Hz operation was successful. Beam current is more than 0.2nA@20Hz operation. Basic accelerator R&D studies (design, construction, beam injection, acceleration and extraction) has been completed.

12. Summary Many improvements since FFAG’04, KEK Basic accelerator R&D studies has been completed. First goal will be achieved soon. Near future plan Test experiments using the extracted beam For medical application, For ADS.