4 research outputs found
The lead-glass electromagnetic calorimeters for the magnetic spectrometers in Hall C at Jefferson Lab
The electromagnetic calorimeters of the various magnetic spectrometers in
Hall C at Jefferson Lab are presented. For the existing HMS and SOS
spectrometers design considerations, relevant construction information, and
comparisons of simulated and experimental results are included. The energy
resolution of the HMS and SOS calorimeters is better than , and pion/electron () separation of about 100:1 has been
achieved in energy range 1 -- 5 GeV. Good agreement has been observed between
the experimental and simulated energy resolutions, but simulations
systematically exceed experimentally determined suppression factors by
close to a factor of two. For the SHMS spectrometer presently under
construction details on the design and accompanying GEANT4 simulation efforts
are given. The anticipated performance of the new calorimeter is predicted over
the full momentum range of the SHMS. Good electron/hadron separation is
anticipated by combining the energy deposited in an initial (preshower)
calorimeter layer with the total energy deposited in the calorimeter.Comment: 22 pages, 33 figure
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A method to quench and recharge avalanche photo diodes for use in high rate situations
We present a new method of using Avalanche Photo Diodes (APDS) for low level light detection in Geiger mode in high rate situations such as those encountered at the Superconducting Super Collider (SSC). The new technique is readily adaptable to implementation in CMOS VLSI