Difference between revisions of "Pair Spectrometer"
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Energy resolution of 24 FSF (top) and 6 WSF (bottom) counters estimated with | Energy resolution of 24 FSF (top) and 6 WSF (bottom) counters estimated with | ||
| − | the GEANT simulation. The converter thickness corresponds to <math> | + | the GEANT simulation. The converter thickness corresponds to <math> 5x10^{-3} X_0</math>. |
The contribution from the beam spot size (~ 4 mm at the converter) to the energy | 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. | resolution dominates for the high-energy bins of the WSF counters. | ||
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| − | Photon energy spectrum measured by the pair spectrometer | + | 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 | |
| − | FSF and WSF counters. | + | bins. The coincident rate corresponds to a high-luminosity run |
| + | ( <math>10^8</math> photons/sec in the coherent peak ) using Aluminum converter with | ||
| + | the thickness of <math>5 x 10^{-3}</math> radiation lengths. | ||
| + | |||
| + | [[Image:ps_rate.jpg |350px]] | ||
==== Misc ==== | ==== Misc ==== | ||
Revision as of 19:51, 4 December 2008
Contents
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
Excel file with track calculations
Proposed magnet BNL Type: 30D72.
(Power supplies are also available)
Drawings
==30D72 assembly drawing ==30D72 top core ==30D72 bottom core
Pictures
water power connections
Water Power
ISO view
Pole
Pole
Both halves
top half end
coils1
coils2
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 
.
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
( 
photons/sec in the coherent peak ) using Aluminum converter with
the thickness of 
radiation lengths.
Misc
Dose needed to damage Epoxy Media:EpoxyRadDam.pdf
Electronics
