Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 834, Issue -, Pages 149-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2016.08.007
Keywords
GEM; Micromegas; Micro-pattern gas detector; Time projection chamber
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Funding
- US Department of Energy from Brookhaven National Laboratory [DE-SC004168, 200935]
- US Department of Energy from Oak Ridge National Laboratory [DE-AC02-98-CH10886, 4000132727]
- US Department of Energy award [DE-SC0014550, DE-SC0003892, DE-SC0013391]
- U.S. Department of Energy (DOE) [DE-SC0003892, DE-SC0014550, DE-SC0013391] Funding Source: U.S. Department of Energy (DOE)
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We measured the properties of a novel combination of two Gas Electron Multipliers with a Micromegas for use as amplification devices in high-rate gaseous time projection chambers. The goal of this design is to minimize the buildup of space charge in the drift volume of such detectors in order to eliminate the standard gating grid and its resultant dead time, while preserving good tracking and particle identification performance. To characterize this micro-pattern gas detector configuration, we measured the positive ion back-flow and energy resolution at various element gains and electric fields, using a variety of gases, and additionally studied crosstalk effects and discharge rates. At a gain of 2000, this configuration achieves an ion back-flow below 0.4% and an energy resolution better than sigma/E = 12% for Fe-55 X-rays. (C) 2016 Elsevier B.V. All rights reserved.
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