Construction and performance of the barrel electromagnetic calorimeter for the GlueX experiment

Abstract

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 π 0 and η production of σ E /E=5.2%/ E(GeV)⊕ 3.6% and a timing resolution of σ = 150 ps at 1 GeV.

Photoproduction of Axionlike Particles

“…We take the GLUEX acceptance, efficiency, and resolution from Refs. [54,55], and the corresponding values for the small-angle calorimeter from Ref. [52].…”

Beam asymmetry Σ for the photoproduction of η and η′ mesons at EγAdhikari1, Ali2, Amaryan3 et al. 2019Phys. Rev. CSelf Cite19270View full textAdd to dashboardCite

“…The drift chambers also provide energy-loss information which allows for π -p separation up to about 1 GeV/c momentum. A lead-scintillating-fiber barrel calorimeter encompasses all the drift chambers and measures the position, energy, and time of all incident particles [20]. Downstream past the solenoid is a scintillator-based time-offlight (TOF) wall that measures the arrival time of charged particles.…”

Development of a novel high quantum efficiency MV x‐ray detector for image‐guided radiotherapy: A feasibility study

“…The lead-fiber matrix, constructed at the Department of Physics, University of Regina, was initially 4 m long and part of an early prototype of one of the 48 identical azimuthal segments in a barrel calorimeter for a GlueX experiment. This calorimeter, shaped as a 390-cm-long (hollow) cylinder having inner and outer radii of 65 and 90 cm, respectively, with a total weight of 28 tons, detects neutral and charged particles in the nuclear physics experiment GlueX, 26 whose central goal is the mapping of hybrid and exotic mesons generated by the excitation of the gluonic field binding the quarks. A 12 9 7 9 2(thickness) cm 3 piece was cut to be used as a proof-of-concept prototype detector described here.…”