CERN Accelerating science

Article
Report number	arXiv:1007.1131
Title	Progress on large area GEMs (VCI 2010)
Author(s)	Villa, Marco (CERN ; Bonn U.) ; Duarte Pinto, Serge (CERN ; Bonn U.) ; Alfonsi, Matteo (CERN) ; Brock, Ian (Bonn U.) ; Croci, Gabriele (CERN) ; David, Eric (CERN) ; de Oliveira, Rui (CERN) ; Ropelewski, Leszek (CERN) ; Taureg, Hans (CERN) ; van Stenis, Miranda (CERN)
Publication	2011
Imprint	08 Jul 2010
Number of pages	4 p, 4
Note	Comments: 4 pages, 8 figures, preprint submitted to Nuclear Instruments and Methods A 4 pages, 8 figures, preprint submitted to Nuclear Instruments and Methods A
In:	Nucl. Instrum. Methods Phys. Res., A 628 (2011) pp.182-186
In:	12th Vienna Conference on Instrumentation, Vienna, Austria, 15 - 20 Feb 2010, pp.182-186
DOI	10.1016/j.nima.2010.06.312
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; TOTEM
Abstract	The Gas Electron Multiplier (GEM) manufacturing technique has recently evolved to allow the production of large area GEMs. A novel approach based on single mask photolithography eliminates the mask alignment issue, which limits the dimensions in the traditional double mask process. Moreover, a splicing technique overcomes the limited width of the raw material. Stretching and handling issues in large area GEMs have also been addressed. Using the new improvements it was possible to build a prototype triple-GEM detector of   2000 cm2 active area, aimed at an application for the TOTEM T1 upgrade. Further refinements of the single mask technique give great control over the shape of the GEM holes and the size of the rims, which can be tuned as needed. In this framework, simulation studies can help to understand the GEM behavior depending on the hole shape.
Copyright/License	Preprint: (License: CC-BY-4.0)

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