{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"eb8034e522c2b6967803c6e1be806b4301027451e9b4f907296f3a48f1698004","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["5306134ec968dd474d6d5c1fabc3dfd1b73b9a0350bf43aeb3c589463075c61d","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"2e4373f24753d0c9600e810588847e3977d8a5653d4ae6ac2595c42af7e0cef0","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":["ai:gpt-5.5"],"external_id":"plasma.hed-fusion.target-gain-ten","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"The best laser fusion shots now release a few times more fusion energy than the laser energy that hits the target. A power plant needs much more, and it is not known whether any target design can reach ten times with today's laser energies.","posed_since":"","precise":"Target gain $G$ $= \\text{fusion yield}/\\text{laser energy}$ on target exceeded 1 at the National Ignition Facility in December 2022 with about $2.05 \\times 10^{13}$ erg of laser energy. Determine whether $G$ of at least 10 is reachable at laser energy of about $2 \\times 10^{13}$ to $3 \\times 10^{13}$ erg by any design (indirect drive, direct drive, shock ignition, magnetized targets) given measured limits from hydrodynamic instabilities, ablator-fuel mix and drive asymmetry. An answer is an experiment, or a radiation-hydrodynamics design validated against existing ignition shots.","problem_ref":"5306134ec968dd474d6d5c1fabc3dfd1b73b9a0350bf43aeb3c589463075c61d","references":"","settled_by":"An implosion with G above 10, or validated simulations showing no design reaches it at that laser energy.","status_note":"NIF reached target gain 4.13 on 7 April 2025 ($8.6 \\times 10^{13}$ erg yield from $2.08 \\times 10^{13}$ erg of laser energy) and about 3.8 in June 2026; gain 10 has not been reached.","title":"Can laser-driven inertial fusion reach target gain of 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