TY  - CONF
AU  - Fasselt, Lucian
AU  - Tortajada, Ignacio Asensi
AU  - Behera, Prafulla
AU  - Berlea, Dumitru Vlad
AU  - Bortoletto, Daniela
AU  - Buttar, Craig
AU  - Dao, Valerio
AU  - Dash, Ganapati
AU  - de Acedo, Leyre Flores Sanz
AU  - Gazi, Martin
AU  - Gonella, Laura
AU  - Haberl, Sebastian
AU  - Inada, Tomohiro
AU  - Jana, Pranati
AU  - Li, Long
AU  - Pernegger, Heinz
AU  - Riedler, Petra
AU  - Snoeys, Walter
AU  - Sánchez, Carlos Solans
AU  - van Rijnbach, Milou
AU  - Núñez, Marcos Vázquez
AU  - Vijay, Anusree
AU  - Weick, Julian
AU  - Worm, Steven
TI  - Charge reconstruction from binary hit data on irradiated MALTA2 Czochralski sensors
JO  - Nuclear instruments & methods in physics research / Section A
VL  - 1080
SN  - 0167-5087
CY  - [Amsterdam]
PB  - Elsevier
M1  - PUBDB-2025-01979
SP  - 170747
PY  - 2025
AB  - MALTA2 is a depleted monolithic active pixel sensor (DMAPS) designed for tracking at high rates and is produced in the modified Tower 180 nm CMOS imaging technology. The pixel pitch is 36.4 µm and the sensing layer consists of either high resistivity epitaxial or Czochralski silicon. The implementation of a small collection electrode features a small pixel capacitance and offers low noise. Typically a detection threshold of around 200 e− is used. It is calibrated making use of a dedicated charge injection circuit on chip and an Fe-55 source. In this contribution, MALTA2 sensors are characterised in terms of hit detection efficiency inside the pixel at fine threshold steps. A comparison is made for samples before and after irradiation at different substrate voltages and with different doping concentration of the internal n-layer. Data was taken at CERN SPS test beam campaigns in 2023 and 2024, using the MALTA beam telescope consisting of six MALTA tracking planes with 4 µm spatial and 2 ns timing resolution. A reconstruction of the most probable signal amplitude from binary hit data is performed. A two-dimensional map of the collected charge is obtained with sub-pixel resolution. The presented method provides an in-beam alternative to grazing angle studies or Edge-TCT for determining a charge collection profile.
T2  - Vienna Conference on Instrumentation 2025
CY  - 17 Feb 2025 - 21 Feb 2025, Vienna (Austria)
Y2  - 17 Feb 2025 - 21 Feb 2025
M2  - Vienna, Austria
LB  - PUB:(DE-HGF)16 ; PUB:(DE-HGF)8
DO  - DOI:10.1016/j.nima.2025.170747
UR  - https://bib-pubdb1.desy.de/record/631467
ER  -