Supermirror polarizer and beam simulations

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Presentation transcript:

Supermirror polarizer and beam simulations Christopher Crawford (UKy) NPDGamma Collaboration Meeting ORNL, 2010-10-15

Outline McStas simulations of beam profile Characterization of SM polarizer by Swiss Neutronics Analysis of FP12 statistics

FnPB supermirror polarizer Fe/Si on boron float glass, no Gd m = 3.0 critical angle n = 45 channels r = 9.6 m radius of curvature l = 40 cm length d = 0.3mm vane thickness T=25.8% transmission P=95.3% polarization N=2.2£1010 n/s output flux (chopped) simulations using McStas / ROOT ntuple

McStas Simulations

Transmission Comparison Presented at collab, mtg. 2007-02-23 34% -> 26% Transmission Changes: Fe/Si coating No Gd undercoat No line of sight

Transmission

Comparison of optimal stats. vs. open pedestal after chopper, pedestal

Comparison of optimal stats. vs. open pedestal after chopper, pedestal

Polarization Comparison Presented at collab, mtg. 2007-02-23 95.6% Polarization Changes: Fe/Si coating No Gd undercoat No line of sight

Polarization Comparison Presented at collab, mtg. 2007-02-23 95.6% -> 95.3% Polarization Changes: Fe/Si coating No Gd undercoat No line of sight

Neutron Flux vs. wavelength, position in vane from polarimetry MRI proposal

Polarization vs. wavelength, position in vane

Neutron flux vs. Λ, Θx

Polarization vs. Λ, Θx

Beam profile before and after Smpol horizontal vertical after

Beam profile at 1st lead wall

Beam profile at 2nd lead wall

Beam profile at LH2 target

Horizontal profile vs. dist. from SMpol

Vertical profile vs. dist. from SMpol

SM polarizer characterization by Swiss Neutronics at PSI

Specifications from SNAG Waviness

Individual Vanes – 2

Individual Vanes – 6

Individual Vanes – 10

Individual Vanes – 14

Individual Vanes – 19

Individual Vanes – 22

Individual Vanes – 26

Individual Vanes – 26R

Reflectivity profile use in McStas simulations R+, P

Reflectivity profile use in McStas simulations R+, P

Transmission measurement at PSI

Polarization measurement at PSI

Polarization measurement data

Measurement of Flux at FP12 Americo Salas Bacci, et al. Technical Note #3

LANSCE FP12 Neutron Flux Measurement Americo Salas Bacci, Technical Note #3

LANSCE FP12 Neutron Flux – Electronics

Fission Chamber energy spectrum from Americo

LANSCE FP12 Neutron Flux – Electronics

Comparison of statistics at LANSCE FP12 Calculation based on: David’s estimate 2010-09-24, Americo’s note 2010-10-14, and Gericke, NIMA 611 239 (2009) 2.68x107 n/s cm2 neutron flux at 100 μA, measured with FC 3.5” collimator, 87.6 μA proton current 4966 runs (after cut) x 104/20 Hz 0.88 (air) x 0.90 (Al) x 0.88 (glass) x 0.346 (3He) transmission 0.60 capture in LH2 x 0.3017 geom. factor 0.53 pol. 3He x 0.989 SF eff. / (1+0.25) bkg. dilution δA = 1.9 x 10-7 from above vs. 2.1 x 10-7 RMS width in A Comparison of raw counts vs. above estimate?