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arXiv · 2608.19226

Serenity-S1, a CMS Tracker Readout and Data Processing Card for HL-LHC

G. Fedi·L. E. Ardila-Perez·M. Balzer·M. Fuchs·M. Holmberg·A. Howard·G. M. Iles·H. A. Krause·T. Mehner·D. Parker·M. Pesaresi·A. Rose·K. Whalen·T. Williams·J. Zhao·for the CMS Collaboration
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Abstract

The CERN Large Hadron Collider will be upgraded to the High-Luminosity LHC, increasing the particle-collision rate and the demands on detector readout. A key element of this upgrade is the new CMS Tracker, whose silicon sensors will generate data at an aggregate rate of about 10 TB/s. This data must be routed efficiently to processing systems and filtered before storage. Serenity-S1 is an ATCA readout and data-processing card based on an AMD Virtex UltraScale+ VU13P FPGA with 128 high-speed serial transceivers. Twenty 12-channel Samtec FireFly optical modules provide up to 120 transmit and 120 receive channels at line rates of up to 25 Gb/s, while an additional optical module supports CMS Tracker links at up to 10 Gb/s per channel. The modular optical layout, combined with the large FPGA, makes Serenity-S1 suitable for several applications within and beyond CMS. ATCA provides the power and cooling required for operation in the CMS service cavern. Low-level management and the IPMI interface are provided by an OpenIPMC mezzanine, while an AMD Kria K26 system-on-module running AlmaLinux 9 performs higher-level board management and application control. Firmware and software frameworks provide common infrastructure so that users can focus on application-specific logic. The paper describes the hardware, firmware and software architecture of Serenity-S1 and its deployment in CMS Tracker integration and R&D activities.

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G. Fedi, L. E. Ardila-Perez, M. Balzer, M. Fuchs, M. Holmberg, A. Howard, G. M. Iles, H. A. Krause, T. Mehner, D. Parker, M. Pesaresi, A. Rose, K. Whalen, T. Williams, J. Zhao, for the CMS Collaboration. 2026-07-29. Serenity-S1, a CMS Tracker Readout and Data Processing Card for HL-LHC. https://doi.org/10.1109/nss%2Fmic%2Frtsd57106.2025.11287225

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