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Published Articles
Title	Combined optical and electronic readout for event reconstruction in a GEM-based TPC
Related title	Combined Optical and Electronic Readout for Event Reconstruction in a GEM-Based TPC
Author(s)	Brunbauer, Florian M (Vienna, Tech. U., Atominst. ; CERN) ; Garcia, Francisco (Helsinki Inst. of Phys.) ; Korkalainen, Tero (CERN) ; Lugstein, Alois (TU Vienna) ; Lupberger, Michael (CERN) ; Oliveri, Eraldo (CERN) ; Pfeiffer, Dorothea (CERN) ; Ropelewski, Leszek (CERN) ; Thuiner, Patrik (CERN) ; Schinnerl, Markus (TU Vienna)
Publication	2018
Number of pages	6
In:	IEEE Trans. Nucl. Sci. 65 (2018) 913-918
DOI	10.1109/TNS.2018.2800775
Subject category	Detectors and Experimental Techniques
Abstract	Optically read out time projection chambers (TPCs) based on gaseous electron multipliers (GEMs) combine 3-D event reconstruction capabilities with high spatial resolution and charge amplification factors. The approach of reconstructing particle tracks from 2-D projections obtained with imaging sensors and depth information from photomultiplier tubes is limited to specific cases such as straight particle trajectories. A combination of optical and electronic readout realized by a semitransparent anode placed between a triple-GEM stack and a camera in an optically read out TPC has been realized and used to reconstruct more complex particle tracks. High spatial resolution 2-D projections combined with a low number of charge readout channels enable accurate 3-D event topology reconstruction. Straight alpha tracks as well as more complex cosmic events have been reconstructed with the presented readout concept. Relative depth information from electronically read out charge signals has been combined with drift time information between primary and secondary scintillation pulses to absolute alpha track reconstructions.
Copyright/License	CC BY

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