1. March 30, 2004 TJR1 MICE Beamline Performance with New Magnet Descriptions Tom Roberts Illinois Institute of Technology March 30, 2004

2. March 30, 2004 TJR2 Progression of Magnet Descriptions JAN04 was designed using block fields, except for the DecaySolenoid which used the coil field (no iron) In the New York Meeting I applied a simple Laplace solution for the fringe fields of B1 and B2; since then I have implemented COSY-style fringe fields for bends and quads Full “rounded +” apertures in the muon quads Q4-Q9 (Q1-Q3 have circular apertures) Good magnetic map of the DecaySolenoid, including its iron Good magnetic map of the upstream and downstream magnetic shields

3. March 30, 2004 TJR3 Comparison of Laplace to COSY-style fringe fields All computations have the same integral By dz.

4. March 30, 2004 TJR4 Decay Solenoid Magnetic Map Even without the Iron, the fringe field extends only ~20-30 cm along the axis (r and z scales are quite different)

5. March 30, 2004 TJR5 Downstream Magnetic Shield (r and z scales are different)

6. March 30, 2004 TJR6 Effects of the Improved Descriptions DescriptionFactorCumulative JAN04 (block fields)1.00 Full apertures in the muon quads Q4-Q9 1.17 COSY-style fringe fields in Bends and Quads 1.421.65 Iron in DecaySolenoid1.021.67 Magnetic shielding upstream and downstream 0.971.62 Factor is from the good-mu+ rate.