Investigation of the Ageing of a Double GEM Structure

<HTML> <HEAD> <h2>Abstract</h2> </HEAD> <P> <BODY> <P> A double GEM structure was irradiated with a strong <SUP>55</SUP>Fe-source. An integrated charge corresponding to about 10<SUP>2</SUP> years of ALICE heavy-ion operation was...

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Detalles Bibliográficos
Autores principales: Sann, H, Stelzer, H, Schmidt, H R
Lenguaje:eng
Publicado: 2000
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/689290
Descripción
Sumario:<HTML> <HEAD> <h2>Abstract</h2> </HEAD> <P> <BODY> <P> A double GEM structure was irradiated with a strong <SUP>55</SUP>Fe-source. An integrated charge corresponding to about 10<SUP>2</SUP> years of ALICE heavy-ion operation was accumulated. Within the accuracy of the measurement, no significant drop in gain was observed. Inspection of the GEM foils under an electron microscope shows no deposits from polymerization; the occurrence of Newton rings, however, indicates the build up of a thin (=&micro;m) polymer film. </BODY> </HTML>

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