Ken Andersen. H1 H5 Extract Brightness from Neutron Measurement Needs end-of-guide position with chopper and TOF analysis Readily available on H1: Figaro,

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Presentation transcript:

Ken Andersen

H1 H5

Extract Brightness from Neutron Measurement Needs end-of-guide position with chopper and TOF analysis Readily available on H1: Figaro, D17, PF1B Not so readily available on H5 (IN15?) Propagate backwards Correct for attenuation through window materials etc. Scale using Au-foil measurement

Use spectrum measured on Figaro (H172)

Detector spectrum corrected for chopper opening time time distance ΔtΔtΔtΔt

Al Bragg edges measured on D17

Al window transmission T=0.875 ⇒ t=20mm

Al window transmission

Detector efficiency Window thickness = 10mm - half of the total 20mm

Air attenuation Ageron measurement at 60% humidity 50cm through air

Attenuation through frame- overlap mirror 0.7mm Si at 3 ° angle

Final corrected spectrum Flux (arb. units)

Propagate backwards through guide

Gold foil measurement August 2007 after installation of H17 guides at VS position: entrance into level C casemate H171 (Figaro) Φ capt =1.07×10 10 n/cm 2 /s H172 (Granit) Φ capt =1.57×10 10 n/cm 2 /s

Evaluate capture flux at VS and rescale

Comparison of capture fluxes Capture Flux (n/cm 2 /s) Measured Calculated from Ageron Present calculation H171 (Figaro) VS 4.24×10 10 August ×10 10 (4.24×10 10 ) H172 (Granit) VS 6.19×10 10 August × ×10 10 H172 (Granit) mono ×10 10 April × ×10 10

Spectral flux at Granit monochromator Spectral flux at λ=8.9Å (n/cm 2 /s/Å) Previous estimate ( ) 6.4×10 8 Ageron brightness 4.4×10 8 Present calculation 5.4×10 8

Brightnesses of HCS & VCS

Summary Previous estimate of 8.9Å flux at Granit was about right Ageron VCS brightness is slightly low needs 50% readjustment in the 1.5-4Å range needs 20% readjustment around 9Å HCS and VCS brightnesses are probably about the same (within 30%)