1. SM Polarizer and Geometry Factors Christopher Crawford University of Tennessee NPDG Collaboration Meeting 2007-02-23

2. Outline SM Polarizer –McStas model ntuple chopper, SF, target 3 He polarizer SM bender –comparisons transmission polarization figure of merit –PPP Analysis –methods of asymmetry extraction –systematic errors in geometry –correcting asymmetry via table motion –geometry factors from Monte Carlo –table motion data

3. McStas Simulations active components –source, ntuple –guides, SM polarizer passive components –chopper, collimators – 3 He cell, RFSF, LH 2

4. SM Polarizers

6. SM Bender Polarizer

7. Transmission Comparison

8. Polarization Comparison

9. Figure of Merit

10. Remnant SM Polarizers

11. Precision Post Polarimetry

12. PPP +’s before and after polarimetry –investigate effect of RFSF, etc can scan P(x,y) don’t need high polarization / intensity can use small 3 He cell compatible with SM polarizer

13. Physics Analysis, Table Motion, and Geometry Factors Methods of asymmetry extraction –weighted average –effect of detector pairing –least squares fit Sources of systematic errors –table misalignment (rotation, translation) –inhomogeneous detector efficiency –detector efficiency asymmetry Methods of table motion correction –correct A V, A H mixing using identical extraction algorithm with table motion; validate method using MC –tune MC to table motion, calculate geometry factors –naïve geometry factors from table motion, add corrections by MC MC simulation methods LH 2 table motion data

14. Weighted Average Extraction

15. Effect of Pairing Detectors weighted average of asymmetries: moral: pair-wise asymmetry equivalent to weighted average of single detector asym.

16. Least Squares Extraction

17. Reduction to Weighted Average

18. Detector Efficiency Asymmetry

19. Table Misalignment

20. Table Motion Corrections -- 1

21. Table Motion Corrections -- 2

22. Table Motion Corrections -- 3

23. MC Calculation of Geom. Factors naïve MC (no physics) –M.G., C.C. 2-step McStas –R.M. McStas + ptrac file –A.S. McStas + modified tally –C.C.

24. LH 2 Table Motion Data -- 1

25. detector 12 detector 0 LH 2 Table Motion Data -- 2

26. ring 0ring 1 ring 2ring 3

27. (end of talk)

28. Degenerate Fermi Gas Particle Decay Higgs? Annihilation Standard Model of Automobiles

29. CPT theorem : ALL laws are invariant under CPT LR R CP (charge, parity) 100 km/h 100 km/h 99.7 km/h T (time) I’m coming home … Be careful, some idiot’s going the wrong way on the freeway. Only one? They’re all over the place! Car Symmetries

30. Car Traps