Speaker
Description
The High-Luminosity upgrade of the LHC requires new
Beam Position Monitor (BPM) Data Acquisition Electronics
capable of improved resolution and robustness. The new sys-
tem is based on a Xilinx RF System-on-Chip, which digitises
the eight BPM signals using integrated high-speed ADCs.
During testing at the end of 2025, significant perturbations
were observed in the system’s orbit measurements after the
first injection of each fill. Subsequent tests revealed that the
cause was the internal background calibration mechanism
of the ADC, which aims to compensate for drifts due to
temperature of the gain, offset and time skew of the internal
sub-ADCs. This paper presents the investigation into the
cause of the perturbations, evaluates candidate mitigation
strategies, and validates the chosen approach with beam data
from the 2026 LHC run.
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