Yazar "Buttar, C." seçeneğine göre listele

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    Latest developments and characterisation results of DMAPS in TowerJazz 180nm for High Luminosity LHC
    (Institute of Physics, 2022) De Acedo, L. Flores Sanz; Allport, P.; Tortajada, I. Asensi; Bortoletto, D.; Buttar, C.; Cardella, R.; Oyulmaz, Kaan Yüksel
    The last couple of years have seen the development of Depleted Monolithic Active Pixel Sensors (DMAPS) fabricated in TowerJazz 180nm with a process modification to increase the radiation tolerance. While many of MAPS developments focus on low radiation environment, we have taken the development to high radiation environment like pp-experiments at High Luminosity LHC. DMAPS are a cost effective and lightweight alternative to state-of-the-art hybrid detectors if they can fulfil the given requirements for radiation hardness, signal response time and hit rate capability. The MALTA and Mini-MALTA sensors have shown excellent detection efficiency after irradiation to the life time dose expected at the outer layers of the ATLAS pixel tracker Upgrade. Our development focuses on providing large pixel matrixes with excellent time resolution (<2ns) and tracking. This publication will discuss characterisation results of the DMAPS devices with special focus on the new MALTA2 sensor and will show the path of future developments © Published under licence by IOP Publishing Ltd.
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    Radiation hardness and timing performance in MALTA monolithic pixel sensors in TowerJazz 180 nm
    (IOP Publishing Ltd, 2022) Rijnbach, M. van; Allport, P.; Asensi, I.; Berdalovic, I.; Bortoletto, D.; Buttar, C.; Denizli, Haluk; Oyulmaz, Kaan Yüksel
    The MALTA family of depleted monolithic pixel sensors produced in TowerJazz 180 nm CMOS technology target radiation hard applications for the HL-LHC and beyond. Several process modifications and front-end improvements have resulted in radiation hardness >10(15) 1 MeV n(eq)/cm(2) and time resolution below 2 ns, with uniform charge collection and efficiency across the pixel of size 36.4 x 36.4 mu m(2) with small collection electrode. This contribution will present the comparison of samples produced on high-resistivity epitaxial silicon with Czochralski substrates, before and after neutron irradiation, and results from MALTA2 with a new cascoded front-end flavour that further reduces the RTS noise.
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    Radiation hardness of MALTA2, a monolithic active pixel sensor for tracking applications
    (IEEE-Inst Electrical Electronics Engineers Inc., 2023) Denizli, Haluk; Berlea, D. V.; Allport, P.; Tortajada, I. Asensi; Bortoletto, D; Buttar, C.
    MALTA is a depleted monolithic active pixel sensor (DMAPS) developed in the Tower Semiconductor 180-nm CMOS imaging process. Monolithic CMOS sensors offer advantages over current hybrid imaging sensors in terms of both increased tracking performance due to lower material budget and ease of integration and construction costs due to the integration of read-out and active sensor into one ASIC. Current research and development efforts are aimed toward radiation hard designs up to 100 Mrad in total ionizing dose (TID) and 1 x 10(15) 1 MeVn(eq)/cm(2) in nonionizing energy loss (NIEL). The design of the MALTA sensors was specifically chosen to achieve radiation hardness up to these requirements and satisfy current and future collider constraints. The current MALTA pixel architecture uses small electrodes which provide less noise, higher signal voltage, and a better power-to-performance ratio. To counteract the loss of efficiency in pixel corners, modifications to the Tower process have been implemented. The MALTA sensors have been tested during the 2021 and 2022 SPS CERN Test Beam in the MALTA telescope. The telescope ran for the whole duration of the beam time and took data to characterize the novel MALTA2 variant and the performance of irradiated samples in terms of efficiency and cluster size. These campaigns show that MALTA is an interesting prospect for HL-LHC and beyond collider experiments, providing both very good tracking capabilities and radiation hardness in harsh radiation environments.