{"paper":{"title":"Quasi-Strong-Strong Beam-Beam Modeling of Bootstrapping Injection in FCC-ee","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Quasi-strong-strong simulations identify stable bootstrapping injection up to nominal bunch population in W and H modes of FCC-ee but saturation below nominal in Z mode.","cross_cats":[],"primary_cat":"physics.acc-ph","authors_text":"Frank Zimmermann, Katsunobu Oide, Takashi Mori","submitted_at":"2026-05-13T02:38:18Z","abstract_excerpt":"The FCC-ee is designed to operate with exceptionally strong beam--beam interactions, making continuous injection a critical and non-trivial aspect of its operation. During the injection process, an unavoidable charge imbalance between the two colliding beams leads to asymmetric beam--beam forces, potentially compromising transverse stability.\n  In this paper, we introduce a quasi-strong-strong (QSS) beam--beam scheme, implemented in the SAD simulation framework. The method preserves a self-consistent beam--beam lens by coupling paired weak--strong simulations, while avoiding the computational "},"claims":{"count":3,"items":[{"kind":"strongest_claim","text":"Stable injection paths up to the nominal bunch population are identified in the W and H modes. In contrast, in the explored parameter region, the Z mode exhibits saturation of the stored population below the nominal value.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The quasi-strong-strong coupling of paired weak-strong simulations accurately preserves the self-consistent beam-beam lens under charge imbalance during gradual bunch population increase.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Quasi-strong-strong simulations identify stable bootstrapping injection up to nominal bunch population in W and H modes of FCC-ee but saturation below nominal in Z mode.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"}],"snapshot_sha256":"1e3a29aa4bb6344591da2c1c3a617478a9a4a6172459199dfd9c6171fbb59f92"},"source":{"id":"2605.12912","kind":"arxiv","version":1},"verdict":{"id":"8bd948c2-10e3-430c-8950-b00309e21df0","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-14T02:26:12.356763Z","strongest_claim":"Stable injection paths up to the nominal bunch population are identified in the W and H modes. In contrast, in the explored parameter region, the Z mode exhibits saturation of the stored population below the nominal value.","one_line_summary":"Quasi-strong-strong simulations identify stable bootstrapping injection up to nominal bunch population in W and H modes of FCC-ee but saturation below nominal in Z mode.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The quasi-strong-strong coupling of paired weak-strong simulations accurately preserves the self-consistent beam-beam lens under charge imbalance during gradual bunch population increase.","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}