Abstract
The combination of small diameter scintillating plastic fibres with arrays of SiPM photodetectors has led to a new class of SciFi trackers usable at high luminosity collider experiments. After a short review of the main principles and history of the scintillating fibre technology, we describe the challenges and developments of the large area Scintillating Fibre Tracker currently under development for the upgraded LHCb experiment.
Highlights
This content has been downloaded from IOPscience
The combination of small diameter scintillating plastic fibres with arrays of Silicon photomultipliers (SiPM) photodetectors has led to a new class of SciFi trackers usable at high luminosity collider experiments
Plastic scintillators which are exposed to substantial doses of ionising radiation show a decrease in light yield which is attributed to two major causes: (1) degraded transmission properties of the base plastic and (2) a degradation of the scintillating fluors
Summary
Scintillating fibres in a tracking detector have two functions: (1) they convert the ionisation deposited by charged particles to optical photons and (2) they transport the optical signal to the readout devices which, in order to minimise the material budget, are often located outside the active volume. A second wavelength shifting dye is admixed (∼0.05% by weight) which absorbs the photons from the activator (blue or UV) and re-emits them (isotropically) at longer wavelengths (blue-green). In this wavelength range, the probability of re-absorption by the dyes is reduced and the photons profit from a generally better transparency of the polystyrene. The trapping fraction is slightly larger, as rays with helical paths and light reflected at the cladding-air interface contribute, these are attenuated quickly along the length of the fibre due to the increased number of reflections and longer pathlength.
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