Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 81: Pixel-Detektoren III

T 81.8: Vortrag

Donnerstag, 22. März 2018, 18:15–18:30, Z6 - HS 0.002

LF-MONOPIX01: A fully monolithic depleted active pixel sensor in a 150nm CMOS process for the ATLAS HL-LHC upgrade — •Ivan Caicedo, Toko Hirono, Tomasz Hemperek, Piotr Rymaszewski, Tianyang Wang, Hans Krüger, Fabian Hügging, Norbert Wermes, and Jochen Dingfelder — Physikalisches Institut, Universität Bonn. Bonn, Germany.

The high-luminosity upgrade of the ATLAS experiment at the LHC requires improvements in terms of radiation hardness and production costs of its inner tracker: Instantaneous luminosity is expected to reach values around 7.5 x 10³⁴ cm⁻²s⁻¹ and the area of the modules will be increased ∼10 times. Moreover, NIEL and TID radiation damage levels of 10¹⁵ n_eq/cm² and 80Mrad are expected in the outermost layer.

Monolithic CMOS active pixel sensors in depleted substrates (DMAPS) are part of the R&D program of ATLAS for its inner tracker upgrade. Manufacturing these sensors in a well-known HV/HR CMOS commercial process permits a high volume production at an affordable cost and enables fast charge collection by drift, which in turn improves the charge collection efficiency after irradiation.

This talk will focus on results of characterization studies of the LF-MONOPIX01 chip, a large fill-factor DMAPS prototype in a 150nm CMOS process with a column-drain read-out architecture. After an introduction to the sensor, we will present noise measurements, threshold distributions and gains for a set of different pixel architectures. Furthermore, we will discuss the leakage current, detection efficiency and charge collection before and after irradiation.