{
  "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.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.27814",
  "author_total": 14,
  "authors": [
    {
      "name": "Harsh Purwar"
    },
    {
      "name": "Shahab Kohani"
    },
    {
      "name": "Vasily Shebalin"
    },
    {
      "name": "Martin Bessner"
    },
    {
      "name": "Matt Andrew"
    },
    {
      "name": "Thomas Browder"
    },
    {
      "name": "Tommy Lam"
    },
    {
      "name": "Kurtis Nishimura"
    },
    {
      "name": "Sourav Patra"
    },
    {
      "name": "Vladimir Savinov"
    },
    {
      "name": "Marko Staric"
    },
    {
      "name": "Gary Varner"
    },
    {
      "name": "Satoru Yamada"
    },
    {
      "name": "Keisuke Yoshihara"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/f106pgnf6xf16.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.27814",
  "fulltext_url": null,
  "id": "f106pgnf6xf16",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.27814",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ex"
    ],
    [
      "arxiv",
      "physics.ins-det"
    ],
    [
      "openalex",
      "3106|Particle Detector Development and Performance"
    ]
  ],
  "openalex": "W7204819439",
  "pdf_url": "https://arxiv.org/pdf/2608.27814",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/f106pgnf6xf16.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "2608.27814",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.27814"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Migration of Belle II TOP Feature Extraction from the Zynq Processing System to PCIe40 Readout PCs",
  "title_text": "Migration of Belle II TOP Feature Extraction from the Zynq Processing System to PCIe40 Readout PCs",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/f106pgnf6xf16",
  "venue": "arXiv",
  "versions": []
}