Ageing in the LHCb outer tracker: Aromatic hydrocarbons and wire cleaning

N. Tuning, M.R. Blom, D. van Eijk, T.J. Ketel, M.H.M. Merk, I.V.N. Mous, A. Pellegrino, T. du Pree, N. Serra, E. Simioni, B. Storaci

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The LHCb Outer Tracker straw tubes have 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 plastifier diisopropyl-naphthalene in araldite AY103-1 used at construction. This paper presents irradiation results with and without the plastifier, together with the mass spectra of the glue samples. In addition, the effects of wire heating and large currents are presented. (C) 2011 Elsevier B.V. All rights reserved.

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