Pernegger, H. et al. (2017) First tests of a novel radiation hard CMOS sensor process for Depleted Monolithic Active Pixel Sensors. Journal of Instrumentation, 12(6), P06008. (doi: 10.1088/1748-0221/12/06/P06008)
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Abstract
The upgrade of the ATLAS [1] tracking detector for the High-Luminosity Large Hadron Collider (LHC) at CERN requires novel radiation hard silicon sensor technologies. Significant effort has been put into the development of monolithic CMOS sensors but it has been a challenge to combine a low capacitance of the sensing node with full depletion of the sensitive layer. Low capacitance brings low analog power. Depletion of the sensitive layer causes the signal charge to be collected by drift sufficiently fast to separate hits from consecutive bunch crossings (25 ns at the LHC) and to avoid losing the charge by trapping. This paper focuses on the characterization of charge collection properties and detection efficiency of prototype sensors originally designed in the framework of the ALICE Inner Tracking System (ITS) upgrade [2]. The prototypes are fabricated both in the standard TowerJazz 180nm CMOS imager process [3] and in an innovative modification of this process developed in collaboration with the foundry, aimed to fully deplete the sensitive epitaxial layer and enhance the tolerance to non-ionizing energy loss. Sensors fabricated in standard and modified process variants were characterized using radioactive sources, focused X-ray beam and test beams before and after irradiation. Contrary to sensors manufactured in the standard process, sensors from the modified process remain fully functional even after a dose of 1015neq/cm2, which is the the expected NIEL radiation fluence for the outer pixel layers in the future ATLAS Inner Tracker (ITk) [4].
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Buttar, Professor Craig and Maneuski, Dr Dima and Bates, Dr Richard |
Authors: | Pernegger, H., Bates, R., Buttar, C., Dalla, M., van Hoorne, J.W., Kugathasan, T., Maneuski, D., Musa, L., Riedler, P., Riegel, C., Sbarra, C., Schaefer, D., Schioppa, E.J., and Snoeys, W. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | Journal of Instrumentation |
Publisher: | IOP Publishing |
ISSN: | 1748-0221 |
ISSN (Online): | 1748-0221 |
Published Online: | 07 June 2017 |
Copyright Holders: | Copyright © 2017 CERN |
First Published: | First published in Journal of Instrumentation 12(6): P06008 |
Publisher Policy: | Reproduced under a Creative Commons license |
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