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About

Nathalie Palanque‑Delabrouille is a leading cosmologist and instrumentalist whose work has been central to the Dark Energy Spectroscopic Instrument (DESI) project. Her research focuses on dark energy, baryon acoustic oscillations (BAO), and the large‑scale structure of the universe, with a particular emphasis on the design, calibration, and data‑analysis challenges of massive spectroscopic surveys. She has made major contributions to the development of DESI’s revolutionary robotic fiber‑positioning system, which simultaneously repositions 5,020 optical fibers every 10–20 minutes with micron‑level precision—a feat that enables the instrument to measure spectra of 40 million galaxies and quasars. Her papers on the DESI focal plane, fiber system, and astrometric calibration (with 175, 57, and 4 citations respectively) are foundational references. She also led the first detection of the BAO signal from early DESI data (37 citations), a milestone in constraining dark energy. Her work on correcting fiber‑assignment incompleteness (25 and 20 citations) ensures unbiased clustering measurements, critical for DESI’s cosmological legacy. With over 400 total citations across her most‑cited papers, Palanque‑Delabrouille’s blend of hardware innovation and precision cosmology has been instrumental in building the largest 3D map of the universe.