1. Catalina Island Meeting 17-19 May, 20001 Proton Drivers for Neutrino Factories: The CERN Approach Presented by B. Autin, CERN

2. Catalina Island Meeting 17-19 May, 2000 General View on Proton Drivers Perspective on CERN/RAL Proton Driver Scenarios Perspective on Bunch Compression Methods The 4 CERN Proton Driver Scenarios: SPL 2 GeV SC Linac + Accumulator/Compressor Three RCS (Rapid Cycling Synchrotron) Scenarios 5 - 30 GeV Conclusions Overview:

3. Catalina Island Meeting 17-19 May, 20003 General Perspective on Proton Drivers for Muon Production:  Many similarities with Spallation Neutron Sources (Beam Power, Energy Range). There exists considerable design experience, although no MW synchrotron has been built yet.  Some problems like the required bunch compression to a few ns are common in Fusion Drivers, but not completely solved there.  Proton Driver specifications are still vague: Rep. rate, # of bunches,  -Collider constraints ?

4. Catalina Island Meeting 17-19 May, 20004 Perspective on PD Scenarios Favorite !

5. Catalina Island Meeting 17-19 May, 20005 Perspective on Bunch Compression Methods

6. Catalina Island Meeting 17-19 May, 20006 Sketch of a possible layout of SPL + PDAC

7. Catalina Island Meeting 17-19 May, 20007 CERN SPL Layout

8. Catalina Island Meeting 17-19 May, 20008 Basic Sections Parameters SPL LINAC

9. Catalina Island Meeting 17-19 May, 20009 P roton D river A ccumulator / C ompressor Accumulator Compressor

10. Catalina Island Meeting 17-19 May, 200010 Accumulation in PDAC 2 1st Turn Injected150 Turns Injected

11. Catalina Island Meeting 17-19 May, 200011 Accumulation in PDAC 2 End of Injection (660 turns) 300 Turns Injected

12. Catalina Island Meeting 17-19 May, 200012 Rotation in PDAC 2 Injected from AccumulatorAfter 7.5 Turns

13. Catalina Island Meeting 17-19 May, 200013 5GeV, 50 Hz Proton Driver 180 MeV H - Linac Two 1.2 GeV, 50 Hz Rapid Cycling Synchrotrons 2 bunches of 2.5 10 13 protons 4 bunches of 2.5 10 13 protons Two 5 GeV, 25 Hz Rapid Cycling Synchrotrons Collimation Injection Momentum Ramping

14. Catalina Island Meeting 17-19 May, 200014 15GeV, 25 Hz, 4MW Proton Driver 180 MeV H - linac Two 15 GeV, 12.5 Hz Rapid cycling synchrotrons, radius 150 m Two 3 GeV, 25 Hz Rapid cycling synchrotrons radius 50 m Injection Achromat 3 bunches of 1.1 x 10 13 protons 6 bunches of 1.1 x10 13 protons

15. Catalina Island Meeting 17-19 May, 200015 CERN 4 MW 30 GeV / 8 Hz Proton Driver 180 MeV H - linac Collimator Achromat 2.2 GeV / 50 Hz Booster R=37.5m 30 GeV Main Ring R=150m ISR Tunnel

16. Catalina Island Meeting 17-19 May, 200016 2 m 1.8 m Mechanically tuned RF Cavity 10 MHz / 100 kV for the 30 GeV / 8 Hz Driver (W. Pirkl)

17. Catalina Island Meeting 17-19 May, 200017 Conclusions: Combined with the Accumulator/Compressor rings operating with a 44 MHz RF system, it matches perfectly CERN's original Muon Rotation and Cooling Scenario. For these reasons it is the favorite CERN scenario and will be presented in the Neutrino Factory Study to be issued in early 2001. Its feasibility is still to be confirmed by the results of the HARP experiment on hadron production cross-sections for proton energies 2-16 GeV. The RCS scenarios are under study until the final choice of the proton energy. The 30 GeV RCS could ultimately complement the SPL Linac to supply protons for a Hadron Faciltity, a Muon Collider and for the SPS above its transition energy. LHC: Increased beam brightness and Luminosity CERN Neutrinos to Gran Sasso (CNGS): Higher proton flux Antiproton Declerator (AD): idem Neutron Time-of-Flight (nTOF) experiments: idem ISOLDE: idem The CERN SPL 2 GeV Superconducting Linac (Design Report to appear this summer) is a multipurpose facility from which most other CERN users would profit: