Pair Spectrometer

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Archive of the working drafts for the pair spectrometer proposal.

== Pair Spectrometer v10.0 (doc) 
== Pair Spectrometer v9.3 pdf 
== Pair spectrometer proposal: Version presented to the Sept08 collaboration meeting
== Pair Spectrometer draft 9 first real Draft to Photon beam group
== Pair Spectrometer draft 7 with Jim's reordering
== Pair spectrometer draft 6 Hrachya's original version

Pair spectrometer overview

PairFig.jpg


Excel file with track calculations

pair spectrometer spreadsheet

Proposed magnet BNL Type: 30D72.

(Power supplies are also available)


30D72.jpg

Drawings

==30D72 drawing d12-m-224-6-1
==30D72 assembly drawing
==30D72 top core
==30D72 bottom core
==30D72 drawing d12-m-228-5-1
==30D72 drawing d12-m-229-5-1

Pictures

GEANT Simulation

Pair Spectrometer's geometry implemented in the GEANT simulation.

Pair layout tdr.jpg

The top plot corresponds to the elevation and the bottom plot corresponds to the plan views.


Energy resolution of 24 FSF (top) and 6 WSF (bottom) counters estimated with the GEANT simulation. The converter thickness corresponds to 5x10^{{-3}}X_{0}. The contribution from the beam spot size (~ 4 mm at the converter) to the energy resolution dominates for the high-energy bins of the WSF counters.

Ps count res.jpg


Photon energy spectrum measured by the pair spectrometer. The plot is obtained by requiring a coincidence between the FSF and WSF counters and contains 24 x 6 = 144 energy bins. The coincident rate corresponds to a high-luminosity run ( 10^{8} photons/sec in the coherent peak ) using Aluminum converter with the thickness of 5x10^{{-3}} radiation lengths.

Ps rate.jpg

Magnetic simulations

ANSYS simulations

Misc

Dose needed to damage Epoxy Media:EpoxyRadDam.pdf

Electronics

Readout concept

Pair Readout.gif

Readout electronics

Pair trigger.gif

Trigger electronics


Links up

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