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SM Polarizer and Geometry FactorsPowerPoint Presentation

SM Polarizer and Geometry Factors

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### SM Polarizer andGeometry Factors

Christopher Crawford

University of Tennessee

NPDG Collaboration Meeting

2007-02-23

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

McStas Simulations

active components

source, ntuple

guides, SM polarizer

passive components

chopper, collimators

3He cell, RFSF, LH2

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

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

Effect of Pairing Detectors

- weighted average of asymmetries:
- moral: pair-wise asymmetry equivalentto weighted average of single detector asym.

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.

LH2 Table Motion Data -- 1

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

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