[SBS_sim] Abstract for APS April Meeting 2013

[Vahe Mamyan]

Dear all,

Please see an abstract for APS April Meeting.

Thank you,
Vahe

                               Vahe Mamyan for the SBS collaboration

A “shashlik” hadron calorimeter is being designed for the new Super Bigbite
Spectrometer in
Jefferson Lab Hall-A. The calorimeter will be used in nucleon-coincidence
form-factor experiments
after Jefferson Lab's 12 GeV upgrade. A Geant4 simulation has been
developed to optimize hadron-detection
efficiency, time and spatial resolution in a momentum range of 2-10 GeV/c.
Significant
efforts were made to implement the simulation as realistically as possible.
Simulation has been
validated by measuring detector-response time resolution for cosmic ray
muons in hadron calorimeter
blocks of a similar design, used in the COMPASS experiment. Tests with a
short decay-time
combination, ELJEN 232 scintillator and ELJEN 299-27 wavelength shifter
(WLS), were also
conducted to study their suitability. The results of these tests indicate
that the simulation is able to
predict time resolution with better than 5% precision and the ELJEN
scintillator WLS combination is
suitable for the hadron calorimeter. Simulation indicates ~1.5 ns FWHM time
resolution, 5-3 cm spatial
resolution and more than 90% hadron detection efficiency in the momentum
range of 2-10 GeV/c.
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