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