![HEP2026: 42nd Conference on Recent Developments in High Energy Physics and Cosmology [NTUA] Jul 8 – 11, 2026](/event/1654737/logo-1929213524.png){kind=logo}
Speaker
Description
For the High Luminosity phase of the Large Hadron Collider (HL-LHC), the ATLAS experiment will be equipped with a new state of the art all silicon inner tracker (ITk). This upgrade is designed to cope with the high density of particles on the detector, which will be increased by an order of magnitude, with neutron equivalent fluence reaching up to 3 × 10^15, total ionizing doses up to 3 MGy and charged particle flux up to 230 MHz/cm², at an average pile-up of μ = 200. The development of
electronics control systems under these conditions is a big engineering challenge and multiple sub-systems need to operate in parallel to assist the successful operation of the ITk. Such a subsystem is the Beam Condition Monitoring (BCM) system, that has a dual function. First,
it provides a complementary luminosity measurement (LUMI), contributing to the precision physics experiment of ATLAS. Second, it ensures detector safety through a fast beam abort capability (ABORT),
protecting sensitive frontend electronics from damaging particle showers and assure the continuous operation of ATLAS ITk for the upcoming years.
To address the engineering challenges, a set of custom ASICs with nanosecond-scale response and radiation hardness were designed in close accordance with the ITk Pixel Inner system architecture and
constraints, for both the system structure and the acquisition and control software. The detectors used in the BCM include mini strip arrays used in the strip detector part of the ITk, as well as custom pCVD detectors with ultra-fast timing response. In this work, the design, implementation, and testing strategies that were used in the BCM development are presented as well as the performance of the system compared to the design specifications.