Abstract
A new generation FPGA-based Timing, Trigger and Control (TTC) system based on emerging Passive Optical Network (PON) technology is being investigated to potentially replace the existing off-detector TTC system used by the LHC experiments. The new system must deliver trigger and data with low and deterministic latency as well as a recovered bunch clock with picosecond-level jitter. This new topology offers major improvements over its predecessor: bi-directionality as well as higher capacity. This paper focuses on the figures of merit used to characterize the TTC-PON system both downstream and upstream, on the techniques used to extract them and on the impact of these first results in optimizing the architecture.
Highlights
30 ATLAS PreliminaryModule in a given run is shown in figure 1
Single Event Upsets (SEU) are expected to occur during high luminosity running of the ATLAS SemiConductor Tracker (SCT)
This is consistent with neutron tests from which a negligible SEU cross section was found for 7 MeV neutrons but a measurable SEU cross section was found for 14.1 MeV neutrons and for pions in the momentum range between 300 MeV and 405 MeV and protons with a momentum of 465 MeV [6]
Summary
Module in a given run is shown in figure 1. The cluster occupancy is a good proxy for particle flux, as the rate of noise hits is negligible This plot uses the spread in occupancy over the different barrel layers as well as the variations in occupancy that arose from different runs having different luminosities. The SEU cross section is expected to fall rapidly with Ipin as observed [6] This causes the distribution of Ipin for modules weighted by the number of SEUs observed in a module to be biased towards lower values of Ipin. Using exponential fits to the measured SEU cross section data [6] the predicted distribution of Ipin for modules weighted by the number of SEUs observed could be calculated. Considering the large systematic uncertainties involved, the prediction is in good agreement with the observed number of 2504
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