1. RAL Muon Beam Line Properties

2. ISIS 70 MeV H- injection Ring accelerates up to 800 MeV in about 10 ms 50 Hz cycle - Dual Harmonic System ~ 2 x 1.5 MHz;  ~0.84 100 ns 230 ns 1.2 10 13 protons Rotation Frequency @800 MeV

5. Target Mechanism: Coupled Oscillators: 50 Hz 150 Hz Target Beam Readout

6. 2 ms Target: 50 Hz + 150 Hz motion e.g. equal amplitude: 20 ms

7. 15 cm diam. (90%) Beam: width 15cm contains ~10 13 protons Target: Ti 8×1 mm 2. Intercepts 1‰ by area ~ 3×10 9 protons. Limit by temperature: ~10 8 protons at 50 Hz. Max possible intercepted beam

8. During the 2 ms, with the beam rotating at ~ 1.5 MHz the beam circulates ~ 3x10 3 times During 100  s of active RF; beam circulates 150 times

9. MeV/c Relative Flux Particle Production (800 MeV) LAHET calculations

10. Scattering Angle & Momentum: 50 o 30 o 40 o

11. 800 MeV proton beam 40 o 30 o 50 o

12. Initial p  “Backwards” going muon p  locus, lab frame p  locus, rest frame Largest difference between pion and muon momenta comes from backward going muons.

13. 300 MeV/c  + P  + MeV/c 200 MeV/c  + Note: D2 is fixed to the momentum of the muon. The transmission of  and  is plotted as a fn of the pion momentum selected by D1. ++ ++ D1 D2 Solenoid

14. Suggested Beam Line Layout (schematic) Early questions to be addressed: - modifications to target box ? - how close in can the beam line be ? - position and size of breach in wall ? - do better without any quads?

15. Type II Dipole Magnet 55 degree bend 0.863 T field (1.58 T max)

17. Estimate ~7,500 muons in a 100  s burst every 20 ms. What is the maximum muon rate?