Preprint

PUBDB-2026-00229

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Charge calibration of MALTA2, a radiation hard depleted monolithic active pixel sensor

Fasselt, L. (Corresponding author)Extern*DESY* ; Asensi Tortajada, I. ; Behera, P.Extern* ; Berlea, D. V.DESY* ; Bortoletto, D. ; Buttar, C. ; Dao, V. ; Dash, G. ; de Acedo, L. F. S. ; Gazi, M. ; Gonella, L. ; González, V. ; Haberl, S. ; Inada, T. ; Jana, P. ; Li, L. ; Pernegger, H. ; Riedler, P. ; Snoeys, W. ; Solans Sánchez, C. ; van Rijnbach, M. ; Núñez, M. V. ; Vijay, A. ; Weick, J. ; Worm, S.DESY*

2026

This record in other databases:    

Please use a persistent id in citations: doi:10.3204/PUBDB-2026-00229

Report No.: arXiv:2501.13562

Abstract: MALTA2 is a depleted monolithic active pixel sensor (DMAPS) designed for tracking at high rates and typically low detection threshold of 200e−. Threshold calibration is crucial to understanding the charge collection in the pixel. A simple procedure is developed to calibrate the threshold to unit electrons making use of a dedicated charge injection circuit and an Fe-55 source with dominant charge deposition of 1611e−. The injection voltage corresponding to the signal under exposure of Fe-55 is determined and serves as the basis for charge calibration. The charge injection circuit incorporates a capacitance with design value of Cinj=230aF. Experimentally, the average capacitance value for non-irradiated samples is found to be Cinj,exp=255±35aF and varies between sensors by 14% in terms of standard deviation. The deviation from the design value as well as among sensors motivates the need for the presented calibration procedure, which is proposed to be performed for each MALTA2 sensor and reduces the uncertainty down to 3% depending on the sensor.

Keyword(s): DMAPS ; Charge calibration ; Tracking ; High-energy physics

---

Contributing Institute(s):

1. Z_DET (Z_DET)

Research Program(s):

1. 622 - Detector Technologies and Systems (POF4-622) (POF4-622)
2. AIDAinnova - Advancement and Innovation for Detectors at Accelerators (101004761) (101004761)
3. AIDA-2020 - Advanced European Infrastructures for Detectors at Accelerators (654168) (654168)
4. STREAM - Smart Sensor Technologies and Training for Radiation Enhanced Applications andMeasurements (675587) (675587)

Experiment(s):

1. Measurement at external facility

---

Database coverage:
; ; Published

---

---

Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Fasselt, L. (Corresponding author)Extern*DESY* ; Asensi Tortajada, I. ; Behera, P.Extern* ; Berlea, D. V.DESY* ; Bortoletto, D. ; Buttar, C. ; Dao, V. ; Dash, G. ; de Acedo, L. F. S. ; Gazi, M. ; Gonella, L. ; González, V. ; Haberl, S. ; Inada, T. ; Jana, P. ; Li, L. ; Pernegger, H. ; Riedler, P. ; Snoeys, W. ; Solans Sánchez, C. ; van Rijnbach, M. ; Núñez, M. V. ; Vijay, A. ; Weick, J. ; Worm, S.DESY*
Charge calibration of MALTA2, a radiation hard depleted monolithic active pixel sensor
Nuclear instruments & methods in physics research / Section A 1082, 170972 (2026) [10.1016/j.nima.2025.170972]2026     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

---