Physics – Instrumentation and Detectors
Scientific paper
2007-07-17
IEEETrans.Nucl.Sci.54:2646-2652,2007
Physics
Instrumentation and Detectors
6 pages, 14 figures, published in IEEE Transactions on Nuclear Science, v2 updated text and figures
Scientific paper
10.1109/TNS.2007.909912
The planned tracking upgrade of the STAR experiment at RHIC includes a large-area GEM tracker used to determine the charge sign of electrons and positrons produced from W+(-) decays. For such a large-scale project commercial availability of GEM foils is necessary. We report first results obtained with a triple GEM detector using GEM foils produced by Tech-Etch Inc. of Plymouth, MA, USA. Measurements of gain uniformity, long-term stability as well as measurements of the energy resolution for X-Rays are compared to results obtained with an identical detector using GEM foils produced at CERN. A quality assurance procedure based on optical tests using an automated high-resolution scanner has been established, allowing a study of the correlation of the observed behavior of the detector and the geometrical properties of the GEM foils. Detectors based on Tech-Etch and CERN produced foils both show good uniformity of the gain over the active area and stable gain after an initial charge-up period, making them well suited for precision tracking applications.
Azmoun B.
Becker Udo
Burns Laura
Crary D.
Kearney Ken
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