Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 896, Issue -, Pages 24-42Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2018.04.006
Keywords
Electromagnetic calorimeter; Sampling calorimeter; Scintillating fibers; Silicon photomultipliers; MPPC; GlueX
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Funding
- U.S. Department of Energy, Office of Nuclear Physics Division [DE-AC05-06OR23177]
- Natural Sciences and Engineering Research Council of Canada [SAPPJ-2015-00024]
- Department of Energy [DE-FG02-05ER41374, DE-FG02-87ER40315]
- Chilean Comision Nacional de Investigacion Cientifica y Tecnologica grant [ACT-1413]
- BASAL grant [FB-0821]
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The barrel calorimeter is part of the new spectrometer installed in Hall D at Jefferson Lab for the GlueX experiment. The calorimeter was installed in 2013, commissioned in 2014 and has been operating routinely since early 2015. The detector configuration, associated Monte Carlo simulations, calibration and operational performance are described herein. The calorimeter records the time and energy deposited by charged and neutral particles created by a multi-GeV photon beam. It is constructed as a lead and scintillating-fiber calorimeter and read out with 3840 large-area silicon photomultiplier arrays. Particles impinge on the detector over a wide range of angles, from normal incidence at 90 degrees down to 11.5 degrees, which defines a geometry that is fairly unique among calorimeters. The response of the calorimeter has been measured during a running experiment and performs as expected for electromagnetic showers below 2.5 GeV. We characterize the performance of the BCAL using the energy resolution integrated over typical angular distributions for pi(0) and eta production of sigma(E)/E = 5.2%/root E (GeV) circle plus 3.6% and a timing resolution of sigma = 150 ps at 1 GeV.
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