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Report number	LHCb-PROC-2009-019 ; LHCb-CONF-2009-019 ; CERN-LHCb-CONF-2009-019
Title	Ageing in the LHCb outer tracker: Phenomenon, culprit and effect of oxygen
Related title	Ageing Phenomena in the LHCb Outer Tracker
Author(s)	Bachmann, S (U. Heidelberg (main)) ; Bagaturia, Y (U. Heidelberg (main)) ; Blom, M (NIKHEF, Amsterdam) ; Ceelie, L (NIKHEF, Amsterdam) ; van Eijk, D (NIKHEF, Amsterdam) ; Faerber, Ch (U. Heidelberg (main)) ; Haas, T (U. Heidelberg (main)) ; Mous, I (NIKHEF, Amsterdam) ; Nawrot, A (Warsaw, Inst. Nucl. Studies) ; Pellegrino, A (NIKHEF, Amsterdam) ; Van Petten, O (NIKHEF, Amsterdam) ; Simioni, E (NIKHEF, Amsterdam) ; Storaci, B (NIKHEF, Amsterdam) ; Szczekowski, M (Warsaw, Inst. Nucl. Studies) ; Tuning, N (NIKHEF, Amsterdam) ; Uwer, U (U. Heidelberg (main)) ; Wiedner, D (U. Heidelberg (main))
Publication	2010
Imprint	07 Oct 2009
Number of pages	4
In:	Nucl. Instrum. Methods Phys. Res., A 617 (2010) 202-205
In:	11th Pisa Meeting on Advanced Detectors on Frontier Detectors For Frontier Physics, La Biodola, Italy, 24 - 30 May 2009, pp.202-205
DOI	10.1016/j.nima.2009.10.049
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Free keywords	LHCb ; Outer tracker ; Tracking detectors ; Gas detectors ; Straw tubes ; Ageing
Abstract	The LHCb Outer Tracker (OT) detector has shown to suffer from gain loss after irradiation in the laboratory at moderate intensities. Under irradiation an insulating layer is formed on the anode wire. The ageing is caused by contamination of the counting gas due to outgassing of the glue used in construction namely araldite AY103-1. The gain loss is concentrated upstream the gas flow, and at moderate irradiation intensity only. The ageing rate is reduced by longterm flushing and by the addition of a few percent of O2 to the gas mixture. Furthermore, applying a large positive high voltage (beyond the amplification regime) removes the insulating deposits without damaging the wire surface. This paper presents both the characteristics of the ageing phenomenon and the beneficial treatments.
Referee	Pellegrino, A
Copyright/License	Preprint: (License: CC-BY-4.0)

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