Catalina Island Meeting May, Proton Drivers for Neutrino Factories: The CERN Approach Presented by B. Autin, CERN

Catalina Island Meeting 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 GeV Conclusions Overview:

Catalina Island Meeting May, 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 ?

Catalina Island Meeting May, Perspective on PD Scenarios Favorite !

Catalina Island Meeting May, Perspective on Bunch Compression Methods

Catalina Island Meeting May, Sketch of a possible layout of SPL + PDAC

Catalina Island Meeting May, CERN SPL Layout

Catalina Island Meeting May, Basic Sections Parameters SPL LINAC

Catalina Island Meeting May, P roton D river A ccumulator / C ompressor Accumulator Compressor

Catalina Island Meeting May, Accumulation in PDAC 2 1st Turn Injected150 Turns Injected

Catalina Island Meeting May, Accumulation in PDAC 2 End of Injection (660 turns) 300 Turns Injected

Catalina Island Meeting May, Rotation in PDAC 2 Injected from AccumulatorAfter 7.5 Turns

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

Catalina Island Meeting May, GeV, 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 protons 6 bunches of 1.1 x10 13 protons

Catalina Island Meeting May, 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

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

Catalina Island Meeting May, 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 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: