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Current atomic models of opacity remain a major source of uncertainty, factoring into discrepancies between standard solar models and helioseismic observations. Agreement with models could be attained if key opacity values were 10%\u201350% larger, motivating high-precision experimental benchmarks at stellar interior conditions. The Opacity-on-National Ignition Facility campaign measures iron opacity via x-ray transmission through samples heated in a hohlraum. Previous measurements using the time-integrated opacity spectrometer (OpSpec) have been limited to temperatures &amp;lt;160\u00a0eV and electron densities \u223c1021\u20131022\u00a0cm\u22123. Higher temperatures are achievable, but measurements were precluded by strong background emission. To address this limitation, a new time-resolved spectrometer, OpSpecTR, was developed. OpSpecTR employs an elliptically bent crystal and a grazing-incidence x-ray mirror to achieve high spectral purity, and a small crossover slit to minimize background. Time-resolved spectra in the 1\u20132\u00a0keV range are recorded on three ns-gated hCMOS detectors, simultaneously measuring transmitted, backlighter, and self-emission signals required for opacity extraction. Nanosecond-scale gating isolates the backlighter pulse and reduces background contributions by up to 70%. Spectral resolving power is also improved \u223c2\u00d7 relative to the time-integrated instrument. The first results from OpSpecTR presented herein demonstrate significantly improved fidelity in opacity measurements under high-temperature conditions, advancing experimental constraints on stellar opacity models.<\/jats:p>","DOI":"10.1063\/5.0349364","type":"journal-article","created":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T12:49:19Z","timestamp":1790945359000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["First results from the time resolved opacity spectrometer on the National Ignition Facility (invited)"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1432-3989","authenticated-orcid":false,"given":"Y. 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