Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 808, Issue -, Pages 83-92Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2015.11.071
Keywords
GEM detector; U-V strip; Stereo-angle readout; Position resolution; Angular resolution; Test beam
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Funding
- Brookhaven National Laboratory through the eRD6 Consortium within the EIC RD program
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A large-area and light-weight gas electron multiplier (GEM) detector was built at the University of Virginia as a prototype for the detector R&D program of the future Electron Ion Collider. The prototype has a trapezoidal geometry designed as a generic sector module in a disk layer configuration of a forward tracker in collider detectors. It is based on light-weight material and narrow support frames in order to minimize multiple scattering and dead-to-sensitive area ratio. The chamber has a novel type of two dimensional (2D) stereo-angle readout board with U-V strips that provides (r,(0) position information in the cylindrical coordinate system of a collider environment. The prototype was tested at the Fermilab Test Beam Facility in October 2013 and the analysis of the test beam data demonstrates an excellent response uniformity of the large area chamber with an efficiency higher than 95%. An angular resolution of 60 Karl in the azimuthal direction and a position resolution better than 550 pm in the radial direction were achieved with the U-V strip readout board. The results are discussed in this paper. (C) 2015 Elsevier B.V. All rights reserved.
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