1. Diffuser in G4MICE Victoria Blackmore 09/03/10 Analysis Meeting 1/8

2. Summary Extra diffuser components were included in the G4MICE model. Comparisons were made with calculations in MICE Note 176  Some issues, now corrected. 2/8

3. Summary Figure 3 from MICE Note 176                       Inside tracker (z = -5700 mm) Put in a beam here Determine beam optics here 3/8

4. 7.5mm Lead Disc Normalised transverse emittance (mm.rad) AlphaBeta (mm) Calculation6.0~0333 7.5mm disc5.58-0.04326.6 Diffuser (inc. 7.5mm disc) 5.52-0.04329 Normalised transverse emittance (mm.rad) AlphaBeta (mm) Calculation2.50.23779 7.5mm disc2.460.25780.7 Diffuser (inc. 7.5mm disc) 2.470.24774 Upstream Parameters: Downstream Parameters: 4/8

5. 15.5mm Lead Disc Normalised transverse emittance (mm.rad) AlphaBeta (mm) Calculation10.0~0333 15.5mm disc9.29-0.03316 Diffuser (inc. 15.5mm disc) 9.19-0.07316 Normalised transverse emittance (mm.rad) AlphaBeta (mm) Calculation2.50.431306 15.5mm disc2.470.411291 Diffuser (inc. 15.5mm disc) 2.470.411286 Upstream Parameters: Downstream Parameters: 5/8

6. Beam Distributions (7.5mm) 6/8

7. Beam Distributions (15.5mm) 7/8

8. Finally... Calculations verified by G4MICE  Small difference between simulations using only the lead disc, and with the more realistic model. To do  Input a “real” beam from the TOF  Make a plot of the change in beam optics from the TOF and through the diffuser  Anything else? 8/8