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Study of MALTA2, a Depleted Monolithic Active Pixel Sensor, with grazing angles at CERN SPS 180 GeV/c hadron beam

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arxiv 2502.13590 v1 pith:Y73M2TME submitted 2025-02-19 hep-ex physics.ins-det

L. Li , P. Allport , I. Asensi Tortajada , P. Behera , D. V. Berlea , D. Bortoletto , C. Buttar , V. Dao
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G. Dash L. Fasselt L. Flores Sanz de Acedo M. Gazi L. Gonella V. Gonzalez G. Gustavino S. Haberl T. Inada P. Jana H. Pernegger P. Riedler W. Snoeys C. A Solans Sanchez M. van Rijnbach M. Vazquez Nunez A. Vijay J. Weick S. Worm
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classification hep-exphysics.ins-det
keywords beamactiveanglesdepletedmalta2sensorcerngrazing
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abstract

MALTA2 is a Depleted Monolithic Active Pixel Sensor designed to meet the challenging requirements of future collider experiments, in particularly extreme radiation tolerance and high hit rate. The sensor is fabricated in a modified Tower 180 nm CMOS imaging technology to mitigate performance degradation caused by 100 MRad of Total Ionising Dose and greater than 10^{15} 1 MeV n_{eq}/cm^2 of Non-Ionising Energy Loss. MALTA2 samples have been tested during the CERN SPS test beam campaign in 2023-2024, before and after irradiation at a fluence of 1 $\times$ 10^{15} 1 MeV n_{eq}/cm^2. The sensors were positioned at various inclinations relative to the beam, covering grazing angles from 0 to 60 degrees. This contribution presents measurements of detection efficiency and cluster size as functions of these angles, along with an estimation of the active depth of the depleted region based on the test beam results.

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  1. TCAD + Allpi$\text{x}^2$ Simulation study of MALTA2, a Depleted Monolithic Active Pixel Sensor for future tracking

    physics.ins-det 2026-05 unverdicted novelty 4.0 of 10

    The TCAD-Allpix² framework optimizes N-type blanket doping for MALTA2 and matches measured active depth to within 2% using grazing-angle tests.

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