1. TJR 7/30/031 Geant4 Simulations of the MICE Beamline Tom Roberts Illinois Institute of Technology 7/30/03

2. TJR 7/30/032 MICE Beam Layout and Tune Layout from “LAYOUT-MICE 14May03” –Bend 1 is 60°, Bend 2 is 32° –Target to Diffuser1 is 18.8 m Quad (Type IV) and Bending Magnet (Type I) parameters are from RAL drawings and tables. Fringe fields for Bending Magnets were computed via Laplace’s equation; quads are ideal (no fringe fields). Bend 1 is tuned for 300 MeV/c pions Bend 2 is tuned for 200 MeV/c muons Quads are tuned for maximum mu/pi ratio at Diffuser1 (using minuit) – the triplet is configured DFD (~20% better than FDF) Quad tuning gives ~60 times better mu/pi than reported in New York

3. TJR 7/30/033 Input Beam Pi+ beam 200 MeV/c < P < 400 MeV/c (uniform) dxdz and dydz generated to cover Q1 aperture (uniform) Target is 10 mm high, 10*cos(25°) mm wide (uniform) All materials kill tracks instantly, without secondaries Absolute normalization to the proton beam is needed, as is the proton background, and the other backgrounds.

4. TJR 7/30/034 Momentum at Diffuser1

5. TJR 7/30/035 P at Q1 for mu+ at Diffuser1

6. TJR 7/30/036 Mu+ Correlation Matrix (normalized) XYdxdzdydzPt X 1.00000.00480.72360.0169-0.08400.0006 Y 0.00481.0000-0.02800.86500.0074-0.0127 dxdz 0.7236-0.02801.0000-0.0389-0.45380.0121 dydz 0.01690.8650-0.03891.00000.00810.0055 P -0.08400.0074-0.45380.00811.0000-0.0157 t 0.0006-0.01270.01210.0055-0.01571.0000 P < 250 MeV/c

7. TJR 7/30/037 Summary The major correlations in the beam should be removable by the diffusers More tunes should be explored (e.g. Bend1 tuned to 350 MeV/c and 400 MeV/c) We need absolute normalization to the proton beam We need to understand the beam backgrounds

8. TJR 7/30/038 Additional Slides The following plots are all at Diffuser1.

9. TJR 7/30/039 Mu+ X vs Y

10. TJR 7/30/0310 Pi+ X vs Y

11. TJR 7/30/0311 Mu+ X vs P

12. TJR 7/30/0312 Pi+ X vs P

13. TJR 7/30/0313 Mu+ X’ vs P Note where X’=0 is.

14. TJR 7/30/0314 Pi+ X’ vs P Note where X’=0 is.

15. TJR 7/30/0315 Mu+ X vs X’ Note where X’=0 is.

16. TJR 7/30/0316 Pi+ X vs X’ Note where X’=0 is.