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SM Polarizer and Geometry Factors

SM Polarizer and Geometry Factors. Christopher Crawford University of Tennessee NPDG Collaboration Meeting 2007-02-23. Outline. SM Polarizer McStas model ntuple chopper, SF, target 3 He polarizer SM bender comparisons transmission polarization figure of merit PPP. Analysis

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SM Polarizer and Geometry Factors

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

  2. Outline SM Polarizer McStas model ntuple chopper, SF, target 3He 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 3He cell, RFSF, LH2

  4. SM Polarizers

  5. 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 3Hecell • 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 AV, AH 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 • LH2 table motion data

  14. Weighted Average Extraction

  15. Effect of Pairing Detectors • weighted average of asymmetries: • moral: pair-wise asymmetry equivalentto 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. LH2 Table Motion Data -- 1

  25. LH2 Table Motion Data -- 2 detector 0 detector 12

  26. LH2 Table Motion Data -- 2 ring 0 ring 1 ring 2 ring 3

  27. (end of talk)

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

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

  30. Car Traps

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