Speaker
Mirco Deckenhoff
(Technische Universitaet Dortmund (DE))
Description
The Scintillating Fibre (SciFi) Tracker for the LHCb Upgrade (CERN/LHCC 2014-001; LHCb TDR 15) is based on 2.5 m long
multi-layered ribbons of 0.250 mm diameter Kuraray SCSF-78MJ scintillating fibre as the active medium and signal transport
over covering 350 m$^{2}$ with silicon photomultiplier (SiPM) arrays for photo-readout. Over 10,000 km of fibre will
turned into precision detector elements. The performance of the detector depends crucially on the geometrical and optical
fibre parameters and, in particular, on their possible degradation due to ionizing radiation. The dearth of results for
this fibre type in the total ionizing dose range of the upgrade, 60 Gy up to 35 kGy, along with conflicting conclusions
regarding annealing and dose rate behaviour in literature, required a set of irradiation campaigns to estimate the
behaviour of the full detector over its lifetime, especially as it is non-linear with dose. We will present results from
the irradiation experiments performed by the LHCb SciFi collaboration over the last two years which show a behaviour due to
radiation damage consistent with published models for polystyrene-based fibres, and are able to reproduce these results in
various test facilities and beams. Other measurements of the fibre properties will be shown as well.
Primary author
Christian Joram
(CERN)
Co-authors
Blake Leverington
(Ruprecht-Karls-Universitaet Heidelberg (DE))
Fred Blanc
(Ecole Polytechnique Federale de Lausanne (CH))
