Fusion Second-Phase Handoff: A domain-first receiver-throughput hypothesis

This working paper proposes a fusion-specific diagnostic framework separating native plasma transition conditions, pathway entry, receiver acceptance and reorganization, and sustained controlled throughput. Entry into a receiving region is not by itself completed transfer. Receiver inventories, processing times and operating corridors must be defined by native physics and tested against established descriptions using the same underlying variables. The release contains the September 2026 primary manuscript in DOCX and PDF, plus an organized supporting archive: a six-exercise empirical synthesis; consolidated negative MAST and synthetic tests; a separate exploratory TCABR magnetic-signal report; an earlier conceptual boundary map; a teaching note; and clearly labeled historical code. A reading guide records evidence levels, accounting clarification and reproducibility gaps. Generic MAST ratios failed to add predictive value. The frozen-time TCV extension did not establish reliable 10-20 ms advance warning. MAST-U and ASDEX Upgrade numerical comparisons include published-figure reconstructions rather than raw-event validation. The TCABR report is a separate preliminary proxy test with unmatched shot ranges and normal-shot alarms; it does not validate the LIFE field equation or receiver throughput. The archived earlier script does not reproduce the later TCABR report protocol. This is a discussion and methods contribution, not a universal fusion law or operational control system. Historical analyses were not independently rerun for this release; several original analysis scripts and intermediate data were not recovered. Raw third-party datasets and private correspondence are not redistributed. David Cecil Jones directed the investigation; AI assisted retrieval, analysis, drafting and organization.