Migration of Belle II TOP Feature Extraction from the Zynq Processing System to PCIe40 Readout PCs

[2608.27814] Migration of Belle II TOP Feature Extraction from the Zynq Processing System to PCIe40 Readout PCs Skip to main content Search Submit Donate Log in Physics > Instrumentation and Detectors arXiv:2608.27814 (physics) [Submitted on 28 Aug 2026] Title: Migration of Belle II TOP Feature Extraction from the Zynq Processing System to PCIe40 Readout PCs Authors: Harsh Purwar , Shahab Kohani , Vasily Shebalin , Martin Bessner , Matt Andrew , Thomas Browder , Tommy Lam , Kurtis Nishimura , Sourav Patra , Vladimir Savinov , Marko Staric , Gary Varner , Satoru Yamada , Keisuke Yoshihara View PDF HTML (experimental) Abstract: The Belle II Time-of-Propagation (TOP) detector is a key system for charged-particle identification (PID). Although TOP operated successfully during initial Belle II data taking, increasing luminosity and beam-induced background led to more frequent single-event upsets (SEUs) in the radiation-exposed Zynq systems-on-chip (SoCs). Resulting lockups of the embedded processing systems (PSs) interrupted data acquisition. To mitigate this limitation, waveform feature extraction, a critical task of the on-detector Zynq PS, was migrated to the off-detector PCIe40 readout PCs (ROPCs). The new architecture bypasses the PS in the event data path and performs feature extraction outside the detector radiation environment. This change removed SEU-induced PS lockups from the event data path and enabled stable operation of the TOP front-end electronics and the Belle II data-acquisition system under increased luminosity and background conditions. The typical TOP deadtime decreased from about 1% to a level consistent with zero after the final firmware patch, and stable operation was demonstrated at a Level-1 (L1) trigger rate of 30 kHz with a microchannel-plate photomultiplier-tube (MCP-PMT) hit rate of approximately 5 MHz per PMT. This paper describes the migrated architecture, its deployment and validation, and its operational and PID performance. Comments: 17 pages, 9 figures Subjects: Instrumentation and Detectors (physics.ins-det) ; High Energy Physics - Experiment (hep-ex) Cite as: arXiv:2608.27814 [physics.ins-det] (or arXiv:2608.27814v1 [physics.ins-det] for this version) https://doi.org/10.48550/arXiv.2608.27814 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Keisuke Yoshihara [ view email ] [v1] Fri, 28 Aug 2026 01:20:51 UTC (5,896 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: physics.ins-det < prev | next > new | recent | 2026-08 Change to browse by: hep-ex physics References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab) Major funding support from

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