Pair Spectrometer

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1 Archive of the working drafts for the pair spectrometer proposal.
2 Pair spectrometer overview
3 Excel file with track calculations
4 Proposed magnet BNL Type: 30D72.
5 Electronics
6 Links up

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

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Pair spectrometer overview

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Excel file with track calculations

pair spectrometer spreadsheet

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Proposed magnet BNL Type: 30D72.

(Power supplies are also available)

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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

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Pictures

water power connections	Water Power	ISO view	Pole
Pole	Both halves	top half end	coils1
coils2

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GEANT Simulation

Pair Spectrometer's geometry implemented in the GEANT simulation.

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 $5 x 10 - 3 X 0$ . 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.

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 ( $108$ photons/sec in the coherent peak ) using Aluminum converter with the thickness of $5 x 10 - 3$ radiation lengths.