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These measurements will provide experimental benchmarks for high electron density effects on atomic structure, including Stark broadening, ionization potential depression, density-dependent line shifts, and suppression of dielectronic recombination, effects that are relevant to spectral modeling packages used by both the high-energy-density and astrophysics communities. Here, we describe the current status of the platform and present results from first experiments using the upgraded frequency-doubling capability, including calibrated K-shell spectra acquired from five time-integrated x-ray channels. Comparisons with multi-electron radiator line shape calculations and with spectra recorded at the atomic weapons establishment\u2019s Orion Laser Facility indicate that the upgraded Titan laser reliably produces the necessary plasma conditions, establishing a foundation for systematic benchmarking of high-density atomic physics in future campaigns.<\/jats:p>","DOI":"10.1063\/5.0350551","type":"journal-article","created":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T12:52:15Z","timestamp":1790945535000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["X-ray spectroscopy of hot dense plasmas using LLNL\u2019s upgraded Titan 2\n                    <i>\u03c9<\/i>\n                    short-pulse laser"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4748-5175","authenticated-orcid":false,"given":"A. 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