Evaluation of HPK $n^+$-$p$ planar pixel sensors for the CMS Phase-2 upgrade

Adam, W.

doi:10.1016/j.nima.2023.168326

Evaluation of HPK $n^+$$-$$p$ planar pixel sensors for the CMS Phase-2 upgrade

Journal Article · 09 May 2023 · Nucl.Instrum.Meth.A

DOI:https://doi.org/10.1016/j.nima.2023.168326· OSTI ID:2202842

Adam, W.

To cope with the challenging environment of the planned high luminosity upgrade of the Large Hadron Collider (HL-LHC), sched-uled to start operation in 2029, CMS will replace its entire tracking system. The requirements for the tracker are largely determinedby the long operation time of 10 years with an instantaneous peak luminosity of up to 7.5 × 1034 cm−2 s−1 in the ultimate perfor-mance scenario. Depending on the radial distance from the interaction point, the silicon sensors will receive a particle fluencecorresponding to a non-ionizing energy loss of up to Φeq = 3.5 × 1016 cm−2. This paper focuses on planar pixel sensor design andqualification up to a fluence of Φeq = 1.4 × 1016 cm−2.For the development of appropriate planar pixel sensors an R&D program was initiated, which includes n+-p sensors on 150 mm(6”) wafers with an active thickness of 150 μm with pixel sizes of 100 × 25 μm2 and 50 × 50 μm2 manufactured by Hamamatsu.Single chip modules with ROC4Sens and RD53A readout chips were made. Irradiation with protons and neutrons, as well was anextensive test beam campaign at DESY were carried out. This paper presents the investigation of various assemblies mainly withROC4Sens readout chips. It demonstrates that multiple designs fulfill the requirements in terms of breakdown voltage, leakagecurrent and efficiency. The single point resolution for 50 × 50 μm2 pixels is measured as 4.0 μm for non-irradiated samples, and6.3 μm after irradiation to Φeq = 7.2 × 1015 cm−2.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: Tracker Group of the CMS

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 2202842

Report Number(s):: CMS-NOTE-2023-002; CERN-CMS-NOTE-2023-002; FERMILAB-PUB-23-621-CMS; arXiv:2212.04793; oai:inspirehep.net:2612736

Journal Information:: Nucl.Instrum.Meth.A, Vol. 1053

Country of Publication:: United States

Language:: English

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