Abstract
As with all detector systems at the Large Hadron Collider (LHC), the assignment of data to the correct bunch crossing, where bunch crossings will be separated in time by 25 ns, is one of the challenges for the ATLAS pixel detector. This document explains how the detector system will accomplish this by describing the general strategy, its implementation, the optimisation of the parameters, and the results obtained during a combined testbeam of all ATLAS subdetectors.
Highlights
As with all detector systems at the Large Hadron Collider (LHC), the assignment of data to the correct bunch crossing, where bunch crossings will be separated in time by 25 ns, is one of the challenges for the ATLAS pixel detector
For the ATLAS pixel detector, as the innermost tracking device, there are several contributions to the timing to be taken into account
The timewalk effect will cause a shift of hits with a Time Over Threshold” (ToT) be- fixed latency of 100 clock cycles, this can be used to read out low a certain value into following events
Summary
The ATLAS experiment is one of the general purpose detectors that will start exploring unprecedented energies in 2007. The innermost part of the tracking system is the pixel detector It is made of 1744 hybrid detector modules. For the ATLAS pixel detector, as the innermost tracking device, there are several contributions to the timing to be taken into account. The collection of the charge released by the passing particles is below 10 ns [5] This is degrading with irradiation, but can be treated as a constant offset of all pixel cells. The Timing Interface Module (TIM, [1]) receiving the ATLAS-wide timing, trigger, and control signal, and distributing it to the BOCs as clock and command information. The Back of Crate Card (BOC) acts as the off-detector detector cells This charge measurement improves the spaopto-electrical interface. These are derived from the TTC clock as received from the TIM
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