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Content archived on 2022-12-23

The charge collection study in microstrip silicon detectors for Quality Assurance CERN-ATLAS SCT program and the future upgrade for LHC experiments.

Objective

Summary
In the proposed program The Consortium will investigate a number of problems important for the QA of strip detector for CERN-ATLAS SCT and for the upgrade of LHC experiments. The major task is to develop a scenario for charge collection performance of the SCT detectors with increasing irradiation fluence, both through the creation of a computer model of the detector properties and through the experimental evaluation of the detector characteristics. The observed earlier delay in the charge collection in non-irradiated detectors – the returned charge component and the double peak electric field distribution in micro strip irradiated detectors will be subjects of particular study up to the maximum ATLAS operational fluence. Due to their origins, related with the strip detector topology and the properties of the SiO2 passivation layer, the test structures will be processed both in Finland and Russia for comparative study. The work on this subject will be adjusted to the ATLAS QA program and the results will presented and discussed as soon as they become available. The same test structures will be processed on Czochralcki grown high resistivity (Cz-HR) silicon with high concentration of oxygen, and will be investigated to make a comparison of the advantages of this new type of silicon for applications in the future upgrades of the LHC experiments.
The Consortium will develop a new detector design for Roman pots. It is based on the electric field stabilization in the sensitive volume by current injection, which was developed by RD39 CERN collaboration for very radiation hard detectors. The prototypes of the detectors will be processed on CdTe or CdZnTe mono-crystalline material, and on heavily pre-irradiated silicon, and then evaluated. The static electrical characteristics and the detector response will be investigated to evaluate the possibility for application in Roman pot detectors. The final outcome of this work will be a review report, summarizing the scenario the detectors charge collection performance along the period of CERN-ATLAS experiments, conclusions on the advantages of the Cz-HR silicon for their use as a material for radiation hard detectors, and the prospect of the new construction of edgeless detectors application in Roman pots.

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Keywords

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Funding Scheme

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Coordinator

Helsinki Institute of Physics
EU contribution
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Address
CERN/EP
1211 Geneve
Switzerland

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Total cost

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Participants (6)

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