CERN Accelerating science

ATLAS Note
Report number	ATL-ELEC-99-001
Title	Irradiation Studies of Multimode Fibres for use in ATLAS Front-end Links
Author(s)	Mahout, G ; Andrieux, M L ; Arvidsson, C B ; Charlton, D G ; Dinkespiler, B ; Dowell, John D ; Gallin-Martel, L ; Homer, RJ ; Jovanovic, P ; Kenyon, Ian Richard ; Kuyt, G ; Lundqvist, J M ; Mandic, I ; Martin, O ; Pearce, M ; Shaylor, H R ; Stroynowski, R ; Troska, Jan K (Imperial Coll., London) ; Wastie, R L ; Weidberg, AR ; Wilson, J A ; Ye, J
Publication	1999
Imprint	03 Nov 1999
Number of pages	14
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Radiation tolerance ; multimode ; optical fibres
Abstract	The radiation tolerance of three multimode optical fibres has been investigatedto establish their suitability for use in the front-end data links of the ATLAS experiment. Both gamma and neutron irradiation studies are reported. A step-index fibre with a pure silica core showed an induced attenuation of $\sim$0.05 dB/mat 330 kGy(Si) and 1$\times$10$^{15}$ n(1 MeV Si)/cm$^{2}$ and is suitablefor use with the inner detector links which operate at 40-80 Mb/s. A graded-indexfibre with a predominantly germanium doped core exhibits an induced attenuation of $\sim$0.1 dB/mat 800 Gy(Si) and 2$\times$10$^{13}$ n(1 MeV Si)/cm$^{2}$ and is suitable for the calorimeterlinks which operate at 1.6 Gb/s. Measurements of the dose rate dependence of the induced attenuation indicate that the attenuation in ATLAS will be lower.
Copyright/License	Preprint: (License: CC-BY-4.0)

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