Proton Drivers for Neutrino Factories The CERN Approach

Proton Drivers for Neutrino Factories: The CERN Approach Presented by B. Autin, CERN Catalina Island Meeting 17 -19 May, 2000 1

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 17 -19 May, 2000 2

Perspective on PD Scenarios Favorite ! Catalina Island Meeting 17 -19 May, 2000 3

Perspective on Bunch Compression Methods Catalina Island Meeting 17 -19 May, 2000 4

Sketch of a possible layout of SPL + PDAC Catalina Island Meeting 17 -19 May, 2000 5

CERN SPL Layout Catalina Island Meeting 17 -19 May, 2000 6

SPL LINAC Basic Sections Parameters Catalina Island Meeting 17 -19 May, 2000 7

Proton Driver Accumulator / Compressor Accumulator Compressor Catalina Island Meeting 17 -19 May, 2000 8

Accumulation in PDAC 2 1 st Turn Injected Catalina Island Meeting 17 -19 May, 2000 150 Turns Injected 9

Accumulation in PDAC 2 300 Turns Injected Catalina Island Meeting 17 -19 May, 2000 End of Injection (660 turns) 10

Rotation in PDAC 2 Injected from Accumulator Catalina Island Meeting 17 -19 May, 2000 After 7. 5 Turns 11

5 Ge. V, 50 Hz Proton Driver Collimation 180 Me. V H- Linac Momentum Ramping Injection 2 bunches of 2. 5 1013 protons Two 1. 2 Ge. V, 50 Hz Rapid Cycling Synchrotrons 4 bunches of 2. 5 1013 protons Catalina Island Meeting 17 -19 May, 2000 Two 5 Ge. V, 25 Hz Rapid Cycling Synchrotrons 12

15 Ge. V, 25 Hz, 4 MW Proton Driver 6 bunches of 1. 1 x 1013 protons 180 Me. V H- linac Achromat Injection Two 15 Ge. V, 12. 5 Hz Rapid cycling synchrotrons, radius 150 m Catalina Island Meeting 17 -19 May, 2000 3 bunches of 1. 1 x 1013 protons Two 3 Ge. V, 25 Hz Rapid cycling synchrotrons 13 radius 50 m

CERN 4 MW 30 Ge. V / 8 Hz Proton Driver 30 Ge. V Main Ring R=150 m ISR Tunnel 180 Me. V H- linac Collimator Achromat 2. 2 Ge. V / 50 Hz Booster R=37. 5 m Catalina Island Meeting 17 -19 May, 2000 14

Mechanically tuned RF Cavity 10 MHz / 100 k. V for the 30 Ge. V / 8 Hz Driver (W. Pirkl) 2 m 1. 8 m Catalina Island Meeting 17 -19 May, 2000 15

Conclusions: The CERN SPL 2 Ge. V Superconducting Linac (Design Report to appear this summer) is a multipurpose facility from which most other CERN users would profit: • LHC: Increased beam brightness and Luminosity • CERN Neutrinos to Gran Sasso (CNGS): Higher proton flux • Antiproton Declerator (AD): idem • Neutron Time-of-Flight (n. TOF) experiments: idem • ISOLDE: idem 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 Ge. V. The RCS scenarios are under study until the final choice of the proton energy. The 30 Ge. V 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. Catalina Island Meeting 17 -19 May, 2000 16

Perspective on Scenarios Catalina Island Meeting 17 -19 May, 2000 17

Overview: • 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 Ge. V SC Linac + Accumulator/Compressor Three RCS (Rapid Cycling Synchrotron) Scenarios 5 - 30 Ge. V • Conclusions Catalina Island Meeting 17 -19 May, 2000