CERN Accelerating science

Internal Note and Article
Report number	SN-ATLAS-2002-016 ; ATL-COM-MUON-2001-024
Title	A Gas Leak Rate Measurement System for the ATLAS MUON BIS-Monitored Drift Tubes
Author(s)	Alexopoulos, T (Natl. Tech. U., Athens) ; Avramidou, R ; Dris, M ; Filippas-Tassos, A ; Gazis, E N ; Katsoufis, E C ; Maltezos, S ; Savva, Panagiota S ; Stavropoulos, G D ; Tsipolitis, G
Publication	2004
Imprint	20 Oct 2001
Number of pages	18
Note	Accepted as Scientific Note
In:	Nucl. Instrum. Methods Phys. Res., A 521 (2004) 332-342
DOI	10.1016/j.nima.2003.10.095
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Gas leak rate measurement ; Muon drift detectors ; QA_QC
Abstract	A low-cost, reliable and precise system developed for the gas leak rate measurement of the BIS-Monitored Drift Tubes (MDTs) for the ATLAS Muon Spectrometer is presented. In order to meet the BIS-MDT mass production rate, a total number of 100 tubes are tested simultaneously in this setup. The pressure drop of each one of the MDT is measured, within a typical time interval of 48 hours, via a differential manometer comparing with the pressure of a gas tight reference tube. The precision of the method implemented is based on the system temperature homogeneity, with accuracy of ÄT = 0.3 oC. For this reason, two thermally isolated boxes are used testing 50 tubes each of them, to achieve high degree of temperature uniformity and stability. After measuring several thousands of the MDTs, the developed system is confirmed to be appropriate within the specifications for testing the MDTs during the mass production.
Copyright/License	Preprint: (License: CC-BY-4.0)

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