Development of Small-Pitch, Thin 3D Sensors for Pixel Detector Upgrades at HL-LHC

Sultan, D M S (2017) Development of Small-Pitch, Thin 3D Sensors for Pixel Detector Upgrades at HL-LHC. PhD thesis, University of Trento.

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3D Si radiation sensors came along with extreme radiation hard properties, primarily owing to the geometrical advantages over planar sensors where electrodes are formed penetrating through the active substrate volume. Among them: reduction of the inter-electrode distance, lower depletion voltage requirement, inter-columnar high electric field distribution, lower trapping probability, faster charge collection capability, lower power dissipation, and lower inter-pitch charge sharing. Since several years, FBK has developed 3D sensors with a double-sided technology, that have also been installed in the ATLAS Insertable B-Layer at LHC. However, the future High-Luminosity LHC (HL-LHC) upgrades, aimed to be operational by 2024, impose a complete swap of current 3D detectors with more radiation hard sensor design, able to withstand very large particle fluences up to 2×1016 cm-2 1-MeV equivalent neutrons. The extreme luminosity conditions and related issues in occupancy and radiation hardness lead to very dense pixel granularity (50×50 or 25×100 µm2), thinner active region (~100 µm), narrower columnar electrodes (~5µm diameter) with reduced inter-electrode spacing (~30 µm), and very slim edges (~100 µm) into the 3D pixel sensor design. This thesis includes the development of this new generation of small-pitch and thin 3D radiation sensors aimed at the foreseen Inner Tracker (ITk) upgrades at HL-LHC.

Item Type:Doctoral Thesis (PhD)
Doctoral School:Materials, Mechatronics and Systems Engineering
PhD Cycle:29
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/20 MISURE E STRUMENTAZIONE NUCLEARI
Area 09 - Ingegneria industriale e dell'informazione > ING-INF/07 MISURE ELETTRICHE E ELETTRONICHE
Area 09 - Ingegneria industriale e dell'informazione > ING-INF/01 ELETTRONICA
Area 02 - Scienze fisiche > FIS/01 FISICA SPERIMENTALE
Uncontrolled Keywords:3D Si Sensor, HL-LHC, Small-pitch 3D Pixels, Radiation hard sensor
Additional Information:ISBN Number is missing, I don't know how to retrieve it!
Repository Staff approval on:30 Jun 2017 13:50

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