Momentum Slice Real beam pref The following builds

Momentum Slice Real beam pref • The following builds on work by Mark Rayner. • Mark modelled the passage of a “momentum slice” of real, measured, MICE beams through a G 4 MICE simulation of Step VI. • I am considering a Gaussian-like selection of these beams. • All beams here are derived from the (6, 200) m+ data. • All use the same Step VI model, and the same diffuser (7. 5 mm lead disc). pz (Me. V) – Adding in the new (iris) diffuser design will happen in the later stages of this analysis. Gaussian-weighted beam section of width s MICE Analysis Meeting: 22/12/11, Step 1 Analysis, V. Blackmore

Reference muon @ 220 Me. V, Momentum Slice Momentum slice emittance comparison. MICE Analysis Meeting: 22/12/11, Step 1 Analysis, V. Blackmore Whole beam Ref. muon

Reference muon @ 230 Me. V, Momentum Slice eam tre General b Whole beam Ref. muon eam trend General b nd Ref. muon trend Poor matching Momentum slice emittance comparison. trend

Reference muon @ 220 Me. V, Gaussian Beam, s = 0. 5, 5, 10 Me. V MICE Analysis Meeting: 22/12/11, Step 1 Analysis, V. Blackmore Whole beam, s = 10 Me. V Whole beam, s = 5 Me. V Whole beam, s = 0. 5 Me. V Ref. muon/Design b-function

Reference muon @ 230 Me. V, Gaussian Beam, s = 0. 5, 5, 10 Me. V Whole beam, s = 5 Me. V Whole beam, s = 0. 5 Me. V Ref. muon/Design b-function Poor matching MICE Analysis Meeting: 22/12/11, Step 1 Analysis, V. Blackmore

pz (Me. V) Can we limit this problem by altering the reference particle? x z (mm) First attempt: Keep the same Gaussian beam distribution, but alter the reference particle momentum. The compare distance x. Real beam e. g. pref pz (Me. V) Gaussian-weighted beam section of width s MICE Analysis Meeting: 22/12/11, Step 1 Analysis, V. Blackmore pcentre pref pz (Me. V) . . . to be continued.