Pair Spectrometer
Contents
Pair spectrometer overview
18D36 magnet
GEANT Simulation (old)
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.
Electronics
Pair Spectrometer Converter
Technical drawing of Super Harp