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Measuring Multiple Scattering in Step IV Timothy Carlisle Oxford See MICE Note 374 for updated results.

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Presentation on theme: "Measuring Multiple Scattering in Step IV Timothy Carlisle Oxford See MICE Note 374 for updated results."— Presentation transcript:

1 Measuring Multiple Scattering in Step IV Timothy Carlisle Oxford See MICE Note 374 for updated results

2 Intro. Step IV will measure  0 in various materials. G4MICE finds  0 up to 30% less than predictions:  Standard PDG Scattering angle expression: Potential term actually scales with Z. Can we use the trackers to measure MS directly ?

3 Scattering Angle comparison Note:  z LiH = 6.3 cm  z LH2 = 57.6 cm

4 G4MICE: Step IV 63mm LiH Related studies (1) Cooling Eqn. vs G4MICE

5 Method (1) Simulate in G4MICE Step IV fields, no Trackers in sim. geometry Four runs: Empty channel & AFC 35cm LH 2 & 63mm LiH Trk. Rec. still in the pipeline. Apply a smear instead, Gaussian, given: Trk. Rec. to give 6D particle vectors at Trk. Ref Planes: MICE Note #90

6 Method (2) Re-simulate in an empty geometry (just fields) Track downstream beam up to the absorber – Flip momenta – Flip particle sign also – No energy losses Track upstream beam down through the absorber: Track vectors back to the downstream edge of the absorber position Upstream TRP Downstream TRP No AFC, no material

7 Method (3) i)Take vectors at DS edge of Absorber position ii)Calc. angle between them: iii)Plot histogram for all particles. iv)Note:

8 No AFC (empty geometry) Smear  errors onGeant4 tracking 10 20 30 40 50 60 70 80 0.02 0.04 0.06 0.08 0.1 0.12 No Smear

9 AFC, no Absorber Smear 10 20 30 40 50 60 70 80 No Smear

10 AFC + LH 2 Smear 10 20 30 40 50 60 70 80 No Smear

11 AFC + LiH Smear 10 20 30 40 50 60 70 80 No Smear

12 Paraxial beams in G4MICE 35 cm LH 2 63 mm LiH

13 Results No Smear Smear PDGPencil beam No AFC 3.23e-51.73e-2 AFC (windows) 8.69e-31.96e-2 LH 2 1.63e-2 2.79e-21.87e-28.9e-3 LiH 2.15e-2 2.78e-22.46e-22.03e-2    0 mm)   = 2.5 mm)

14 Summary PDG ~ 2x more scattering than G4MICE. Smearing may require further thought re: correlations LH 2 & LiH indistinguishable after smear. LiH measurement < PDG angle. See MICE Note 374 for updated results

15 EXTRAS

16 G4MICE output - 35 cm LH 2

17 Related studies (2) Step IV: LH 2 Step IV: LiH From CM28

18 paraxial beams in G4MICE 35 cm LH 2 63 mm LiH

19 V.L. Highland, Nucl. Instrum. Methods 129, 497 (1975)

20 AFC + LH 2 Smear 10 20 30 40 50 60 70 80 No Sear

21

22

23 AFC + LiH Smear 10 20 30 40 50 60 70 80 No Smear

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