Fibre Optics Cabling Design for LHC Detectors Upgrade Using Variable Radiation Induced Attenuation Model

Abstract

Foreseen upgrades over the next decades enable LHC to operate at a higher luminosity (HL-LHC). Accordingly, the optical links designed to transmit particle collision data need to be hardened against increased radiation level, allowing for a reliable communication. In this paper we study the fibre cabling design of a link between the transceiver optical front-end and the data control room. The radiation penalty calculation takes temperature drop down to -30°C into account. The proposed solution concatenates radiation-resistance and conventional fibres using multi-fibre interconnections. The end-to-end link loss during HL-LHC lifetime is estimated strictly less than 3.5 dB complying with predefined margin.

Characterization of Radiation-Resistant Multimode Optical Fibers for Large-Scale Procurement

“…Systems, such as data acquisition for the CERN particle detectors, are regularly consolidated and upgraded using multi-mode optical fibres. The Versatile Link Plus project is for example one of those projects, which targets the phase II upgrades of the ATLAS and CMS experiments at CERN [1]. That project requires the development of a radiation resistant data link, transmitting 5-10 Gbps data rates in the upstream direction and 2.5 Gbps rates in the downstream, using multi-mode optical fibres.…”