Recent achievements of the ATLAS upgrade Planar Pixel Sensors R&amp;D project

Casse, G.

doi:10.1088/1748-0221/9/04/c04006

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…As the cluster size rises with higher incidence angles, some of the hit pixels (close to track entry/exit points in the sensor) may not even contribute to the signal, especially after irradiation. This is because the charge generated deeper inside the detector undergoes higher charge trapping, resulting in a lower measured signal which may not reach set thresholds, thus inducing resolution distortion [9].…”

Section: Alternative Pixel Geometriesmentioning

confidence: 99%

Silicon sensors with various pixel geometries adapted for a common readout ASIC

Milovanovic

Burdin²,

Dervan³

et al. 2014

J. Inst.

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ATLAS is proposing to replace the entire tracking system for HL-LHC operation. The "Letter of Intent" baseline pixel size at higher radii was 50 × 250 µm 2 (ϕ × η), based on the FE-I4 readout chip, and this was optimized for the central barrel region. The detector tracking performance in the end-cap pixel disks can benefit from enhanced resolution in the radial direction to improve the impact parameter resolution in z-coordinate (along the beam line) for high η tracks, which is critical in the high pile-up environment of the HL-LHC. So called "strixel" geometries, with long narrow pixels, can be proposed at higher z in the barrel where tracks pass through at large angles. Larger pixels may also be considered for an additional pixel layer if this could reduce the requirements, and therefore costs, for the outer part of the tracker.While ATLAS pixel upgrade plans are evolving, the demonstration of providing a variety of sensor pixel shapes and sizes for a common ASIC pixel geometry will be of general application, whatever the final ASIC design. This paper will report on the development and testing of pixel sensors with several different dimensions assembled into modules with the FE-I4 readout chip. Some of these were irradiated (with protons, 10 15 n eq /cm 2 ) and evaluated at the DESY test beam. These, together with the test beam results with non-irradiated sensors, will be shown, as well as the results from laboratory characterization.

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Section: Alternative Pixel Geometriesmentioning

confidence: 99%