The HIE-ISOLDE Project

1. The HIE-ISOLDE Project High Energy upgrade plans for REX-ISOLDE at CERN M. Pasini CERN AB/RF

2. Outlook The present REX accelerator Superconducting linac for heavy ions Advantages of SC linac for RIBs Beam properties Planning Conclusions M. Pasini CERN AB/RF

3. The present REX accelerator 101.28 MHz 202.56 Mhz M. Pasini CERN AB/RF

4. The new experimental hall ~16 m M. Pasini CERN AB/RF

5. A SC Linac for heavy ions Example from SPIRAL-II M. Pasini CERN AB/RF It is basically a series of small (few gaps) independently phased resonators.

6. RF SC CAVITY (1) M. Pasini CERN AB/RF

7. RF SC CAVITY (2) M. Pasini CERN AB/RF

8. LINAC LATTICE Solenoid Vacuum Valve and/or diagnostic box M. Pasini CERN AB/RF

9. SC QWR technologies Bulk niobium Nb sputtered on Cu Courtesy from R. E. Laxdal Courtesy from A. M. Porcellato M. Pasini CERN AB/RF

10. Advantages of sputtered cavities Summary by A-M. Porcellato M. Pasini CERN AB/RF • Mechanical stanot affected by changes He bath Dpbility(mechanical vibrations are not an issue) • Frequency (<0.01Hz/mbar) • Reduced over-coupling (smaller amplifier, coupler do not need cooling, rf lines have reduced size and limited rf dissipation) • High thermal stability(less prone to hot spots, conditioning easier) • Stiffness(in case of loss of isolation vacuum leak…) • Absence of Q-disease(less demand on cryogenic system cooling velocity and reliability) • Insensitivity to small magnetic fields(no magnetic shielding) • High Q of the N.C. cavity(easier coupling in N.C state) • Absence of In vacuum joints(vacuum leaks less probable) • Price(both material and construction)

11. Example of Cryo-module Courtesy of R. E. Laxdal M. Pasini CERN AB/RF

12. Pick-up port Beam port LHe cooling channel Beam port Coupler port Tuning Plate Cavity prototype M. Pasini CERN AB/RF

13. The REX ENERGY UPGRADE PLAN M. Pasini CERN AB/RF • 1st stage: final energy is 5.5 MeV/u, • 2nd stage: final energy is 10 MeV/u In both stages the beam quality has to be preserved (set requirements on the transport optics to the experiments

14. Layout stage 1 M. Pasini CERN AB/RF

15. Layout stage 2 (partial) M. Pasini CERN AB/RF

16. Layout stage 2 (FULL) M. Pasini CERN AB/RF

17. Why SC Linacs? M. Pasini CERN AB/RF SC linacs maintain beam quality for energy variable machines The maximum effective voltage can be applied to lighter masses so to have a higher final energy. SC linacs provide the highest flexibility of operation, i.e. scaling and phase retuning for optimum energy/phase spread

18. 0.900 0.850 0.800 Transit Time Factor 0.750 0.700 0.650 0.600 0.06 0.08 0.10 0.12 0.14 b Acceleration efficiency M. Pasini CERN AB/RF

19. SC LINAC Final energies M. Pasini CERN AB/RF

20. Beam Dynamics M. Pasini CERN AB/RF

21. Injection M. Pasini CERN AB/RF

22. 10 MeV/u A/q=4.5 M. Pasini CERN AB/RF

23. 10 MeV/u A/q=4.5 et = 3p mm, el = 4.6p keV/u ns M. Pasini CERN AB/RF

24. 2.9 MeV/u A/q=4.5 et = 3p mm, el = 4.6p keV/u ns M. Pasini CERN AB/RF

25. 2.9 MeV/u A/q=4.5 et = 3p mm, el = 4.6p keV/u ns M. Pasini CERN AB/RF

26. 14 MeV/u A/q=3 et = 3p mm, el = 4.6p keV/u ns M. Pasini CERN AB/RF

27. PLANNING M. Pasini CERN AB/RF

28. M. Pasini CERN AB/RF

29. Conclusion M. Pasini CERN AB/RF R&D on several issue of the SC linac has started Initial budget for 1.3 MCHF Preparation work for cavity prototype is ongoing In order to make a better linac for the user it’s need a lot of feedback! A full TDR is planned to be released end of 2009 If funding will become available construction of loaded cryo-modules will be completed in 2010 with installation and beam commissioning in 2011.

30. People M. Pasini CERN AB/RF D. Voulot F. Wenander M. Lindros S. Calatroni V. Parma R. Jones P. McIntosh V. Palmieri