The GLUEX beamline and detector

GlueX Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

The GLUEX experiment at Jefferson Lab has been designed to study photoproduction reactions with a 9-GeV linearly polarized photon beam. The energy and arrival time of beam photons are tagged using a scintillator hodoscope and a scintillating fiber array. The photon flux is determined using a pair spectrometer, while the linear polarization of the photon beam is determined using a polarimeter based on triplet photoproduction. Charged-particle tracks from interactions in the central target are analyzed in a solenoidal field using a central straw-tube drift chamber and six packages of planar chambers with cathode strips and drift wires. Electromagnetic showers are reconstructed in a cylindrical scintillating fiber calorimeter inside the magnet and a lead-glass array downstream. Charged particle identification is achieved by measuring energy loss in the wire chambers and using the flight time of particles between the target and detectors outside the magnet. The signals from all detectors are recorded with flash ADCs and/or pipeline TDCs into memories allowing trigger decisions with a latency of 3.3 μs. The detector operates routinely at trigger rates of 40 kHz and data rates of 600 megabytes per second. We describe the photon beam, the GLUEX detector components, electronics, data-acquisition and monitoring systems, and the performance of the experiment during the first three years of operation.

Original languageEnglish
Article number164807
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume987
Early online date9 Nov 2020
DOIs
Publication statusPublished - 21 Jan 2021

Bibliographical note

Funding Information:
We gratefully acknowledge the outstanding efforts of technical support at all the collaborating institutions and the support groups at Jefferson Lab that completed the assembly, installation, and maintenance of the detector. We acknowledge the contributions of D. Bennett, M. Lara, A. Subedi and P. Smith to the construction and commissioning of the Forward Calorimeter. We thank E.C. Aschenauer, G. Young and all members of the JLab 12 GeV Project for guidance and direction during the design and construction phases of the project. This work was supported in part by the U.S. Department of Energy , the U.S. National Science Foundation , the Natural Sciences and Engineering Research Council of Canada (NSERC) , the German Research Foundation, Forschungszentrum Jülich GmbH , GSI Helmholtzzentrum für Schwerionenforschung GmbH , the Russian Foundation for Basic Research , the UK Science and Technology Facilities Council , the Chilean Comisión Nacional de Investigación Científica y Tecnológica , the National Natural Science Foundation of China , and the China Scholarship Council . This material is based upon work supported by The U.S. Department of Energy , Office of Science , Office of Nuclear Physics under contract DE-AC05-06OR23177 .

Funding Information:
We gratefully acknowledge the outstanding efforts of technical support at all the collaborating institutions and the support groups at Jefferson Lab that completed the assembly, installation, and maintenance of the detector. We acknowledge the contributions of D. Bennett, M. Lara, A. Subedi and P. Smith to the construction and commissioning of the Forward Calorimeter. We thank E.C. Aschenauer, G. Young and all members of the JLab 12 GeV Project for guidance and direction during the design and construction phases of the project. This work was supported in part by the U.S. Department of Energy, the U.S. National Science Foundation, the Natural Sciences and Engineering Research Council of Canada (NSERC), the German Research Foundation, Forschungszentrum J?lich GmbH, GSI Helmholtzzentrum f?r Schwerionenforschung GmbH, the Russian Foundation for Basic Research, the UK Science and Technology Facilities Council, the Chilean Comisi?n Nacional de Investigaci?n Cient?fica y Tecnol?gica, the National Natural Science Foundation of China, and the China Scholarship Council. This material is based upon work supported by The U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.

Publisher Copyright:
© 2020

Keywords

  • JLab GlueX photoproduction polarization
  • Solenoid trigger data-acquisition online offline reconstruction

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