The GlueX Barrel Electromagnetic Calorimeter
ORAL
Abstract
The goal of the {\sc GlueX} experiment at Jefferson Lab is to search for exotic hybrid mesons as evidence of gluonic excitations, in an effort to understand confinement in QCD. A key subsystem of the {\sc GlueX} detector is the electromagnetic barrel calorimeter ({\sc BCAL}) located inside a 2-Tesla superconducting solenoid. {\sc BCAL} is a ``spaghetti calorimeter,'' consisting of layers of corrugated lead sheets, interleaved with planes of 1-mm-diameter, double-clad, Kuraray SCSF-78MJ scintillating fibres, bonded in the lead grooves using optical epoxy. The detector will consist of 48 modules and will be readout using nearly 4,000 large-area (1.26~cm$^2$ each) silicon photomultiplier arrays. {\sc BCAL} construction is well under way at the University of Regina and test results will be shown.
*Supported by NSERC grant SAPJ-326516, DOE grant DE-FG02-0SER41374 and Jefferson Science Associates, LLC. under U.S. DOE Contract No. DE-AC05-06OR23177.
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