Book/Master Thesis

PUBDB-2025-03980

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Grazing Angle Test Beam Studies of the Hybrid-to-Monolithic Maps Prototype

Feyens, O. (Corresponding author)DESY* ; Spannagel, S. (Thesis advisor)DESY* ; Ruiz Daza, S. (Thesis advisor)DESY*

2025
Verlag Deutsches Elektronen-Synchrotron Hamburg

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-03980

Report No.: DESY-THESIS-2025-018

Abstract: The Tangerine group at DESY, Hamburg, investigates the potential of Monolithic Active PixelSensors (MAPS) manufactured in a novel 65 nm CMOS imaging process with small collectionelectrode design, as a candidate technology for vertex and tracking detectors in future leptoncollider experiments. One of the activities undertaken to explore the technology is the char-acterisation of prototypes through the analysis of test beam measurements. The device undertest in this thesis is the Hybrid-to-Monolithic (H2M) chip. The investigated property is theactive thickness of the sensor. This is done via the so-called grazing angle method, in whichinformation about the charge collection as a function of depth inside the sensor is generatedthrough the use of ionizing particles impinging the sensor under shallow angles. This conceptis practically realized through the conduction of test beam measurements, and a two-step dataanalysis procedure, in which first the data were organized and then charge collection profileswere constructed, displaying the amount of collected charge as a function of depth inside thesensor. The total active thickness is found to be approximately 13 μm, of which ∼ 2 μm corre-sponds to an incomplete collection close to the sensor surface, followed by ∼ 6 μm of uniformcollection and ∼ 5 μm of exponentially decreasing collected amount of charge. The impact ofseveral chip parameters on the active thickness is investigated. Backside thinning to 25 μm, im-pinging the sensor from sensor surface or backside, varying hit detection threshold, and changesin applied sensor bias voltage are all found to not significantly influence the active thickness ofthe sensor. The results furthermore validated the function of the threshold and ToT calibrationprocedure to correct for non-linear electronics responses.

Note: Masterarbeit, Vrije Universiteit Brussel, 2025

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Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2025

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