1. FFAG-Workshop 2006, Kumatori, Osaka, Japan Injection study for 6-sector PRISM FFAG by using pulsed alpha particles Yasushi Arimoto, Toshiyuki Oki, Makoto Yoshida, Masaharu Aoki, Imam Hossain, Y.Kuriyama Takahisa Itahashi, Yousuke Takubo, Chihiro Ohmori, Akira Sato,and Yoshitaka Kuno Department of Physics, Graduate School of Science, Osaka Univ. 1-1 Machikaneyama, Toyonaka-shi, Osaka 560-0043, Japan

2. FFAG-Workshop 2006, Kumatori, Osaka, Japan Contents Present status of PRISM-FFAG project -Magnet design and construction -Magnet design and construction -Field Measurement of three D-F-D magnets -Field Measurement of three D-F-D magnets Procedure of proof for PRISM by alpha particles injection into a Test RF-cavity Injection study for PRISM with alpha particle in 6-sector accumulator ring

3. FFAG-Workshop 2006, Kumatori, Osaka, Japan

5. Magnetic field measurement 3-D field meaurement device from Prof. Mori, KURRI Power supplies from KEK Current stability in long term at a hot season Mapping of a large area in and outside D-F-D magnet Three D-F-D magnets Calibration of Hall probes with NMR in dipole magnet Calibration of probe axis with a cubic small magnet

6. FFAG-Workshop 2006, Kumatori, Osaka, Japan

7. Present status summary of PRISM-FFAG magnets (Dr. Y. Arimoto-san) Three PRISM-FFAG magnets have been manufactured manufactured 3D magnetic field map of the three magnets has been measured Field measurement shows good consistency with TOSCA calculation Field measurement shows good consistency with TOSCA calculation Precise analysis is now progressed

8. FFAG-Workshop 2006, Kumatori, Osaka, Japan

9. Proof of principle of quarter-turn rotation in phase space for muons with a short lifetime Huge momentum spread : +/- 20% In a limited time for phase rotation : 2.2  s Inj. & Ext. loss : as a little as possible Low background at detector : circular structure for accumulator, not directed to target = PRISM

10. FFAG-Workshop 2006, Kumatori, Osaka, Japan

11. The reason for design of 6-sector accumulator FFAG-ring For proof of principle PRISM -2.2  s For limited budget – magnets 3+2+(1) For limited time for project in 2002-2007 For alpha particle injection- same ligidity For single acc. test-cavity For simple injection, inflector,pulsing, For measurement energy and TOF- proof of principle For limited acceptance- small vacuum chamber

12. FFAG-Workshop 2006, Kumatori, Osaka, Japan 6-sector FFAG accumulator ring with slant magnets manufactured for 10-sector PRISM-FFAG

13. FFAG-Workshop 2006, Kumatori, Osaka, Japan Momentum dependence of vertical and horizontal tune of 6-sector accumulator ring

14. FFAG-Workshop 2006, Kumatori, Osaka, Japan Tune diagrams for 6-sector FFAG-RING

15. FFAG-Workshop 2006, Kumatori, Osaka, Japan Horizontal and vertical acceptance

16. FFAG-Workshop 2006, Kumatori, Osaka, Japan

17. Alpha particles accelerated with an AVF cyclotron from 5.4 MeV to 30 MeV and extracted. Alpha source is located at the proper radius.

18. FFAG-Workshop 2006, Kumatori, Osaka, Japan

19. Pulsar performance for ALPS Pulsing frequency: 1.0MHz Pulse width : 20~30 nsec Duty factor : 0.001 Pulsar voltage: DC + RF ~1.0 KV Pulsar length: 30 cm Pulsar gap: 25 mm

20. FFAG-Workshop 2006, Kumatori, Osaka, Japan Alpha particle source ALPS

21. FFAG-Workshop 2006, Kumatori, Osaka, Japan

22. TOF measuring apparatus for an acceleration test cavity

23. FFAG-Workshop 2006, Kumatori, Osaka, Japan

28. Summary Field measurement for three PRISM-FFAG magnets has been completed Rf-cavity test for saw tooth wave form will be tried soon Alpha particle injection for cavity and sector magnet will be started. This is an appropriate preparation for construction of PRISM-FFAG POP for PRISM will be started in 6-sector ring, although it has not so large acceptance

29. FFAG-Workshop 2006, Kumatori, Osaka, Japan Slides from 30-38 are something for help

30. FFAG-Workshop 2006, Kumatori, Osaka, Japan

31. Transported and injected muon beam Dispersion matched at injection Central momentum : 68 MeV/c R equi = 6.5 m Momentum spread : +/- 20 % Beam intensity 10 11 ~ 10 12 / sec Aperture : 30 cm (v) x 100 cm (h)

32. FFAG-Workshop 2006, Kumatori, Osaka, Japan Requirements for diagnostics in FFAG-PRISM Comparison with anti-proton production Similar facilities as PRISM was ? at CERN and will be AD-project at J- PARC(ref. E.Widman). AD : 200 pi mm mrad and dp/p = 6 % : stable : stable : proton beam of capture momentum is : proton beam of capture momentum is very helpful for tuning very helpful for tuning : various cooling techniques are helpful for storage : various cooling techniques are helpful for storage Comparison with radio-active ion beam at RIBF MUSES : +/- 10 mrad and dp/p = 2.5 % : lifetimes of order of 1 microsec. : lifetimes of order of 1 microsec. : cooling and high luminosity are considered for collision : cooling and high luminosity are considered for collision

33. FFAG-Workshop 2006, Kumatori, Osaka, Japan

34. Sci-Fiber Sci-Fiber could be applied for beam diagnostics in PRISM-FFAG Dr. M. Yoshida-san would have a short comment for this issue Mr. Takayanagi-san would like to develop the device next year.

35. FFAG-Workshop 2006, Kumatori, Osaka, Japan

37. Position sensitive solid state counter (energy and TOF) 50 mm x 50 mm silicon strip solid state counter for energy measurement rf-particle TOF measurement Two dimensional measurement between position and energy position and energy

38. FFAG-Workshop 2006, Kumatori, Osaka, Japan Bunch rotation techniques