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Ageing in the LHCb outer tracker: phenomenon, culprit and effect of oxygen

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 cons...

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Main Authors: Bachmann, Sebastian (Author) , Bagaturia, Y. (Author) , Blom, M. (Author) , Ceelie, L. (Author) , van Eijk, D. (Author) , Färber, Christian (Author) , Haas, Tobias (Author) , Mous, I. (Author) , Nawrot, A. (Author) , Pellegrino, A. (Author) , van Petten, O. (Author) , Simioni, E. (Author) , Storaci, B. (Author) , Szczekowski, M. (Author) , Tuning, N. (Author) , Uwer, Ulrich (Author) , Wiedner, D. (Author)
Format: Article (Journal)
Language:English
Published: 2010
In: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
Year: 2010, Volume: 617, Issue: 1/3, Pages: 202-205
ISSN:1872-9576
DOI:10.1016/j.nima.2009.10.049
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.nima.2009.10.049
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0168900209019548
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Author Notes:S. Bachmann, Y. Bagaturia, M. Blom, L. Ceelie, D. van Eijk, Ch. Färber, T. Haas, I. Mous, A. Nawrot, A. Pellegrino, O. van Petten, E. Simioni, B. Storaci, M. Szczekowski, N. Tuning, U. Uwer, D. Wiedner
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Summary: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.
Item Description:Online verfügbar 10 November 2009
Gesehen am 28.11.2022
Physical Description:Online Resource
ISSN:1872-9576
DOI:10.1016/j.nima.2009.10.049

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