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- W4308692923 abstract "The Hubble diagram of type-Ia supernovae (SNe-Ia) provides cosmological constraints on the nature of dark energy with an accuracy limited by the flux calibration of currently available spectrophotometric standards. The StarDICE experiment aims at establishing a 5-stage metrology chain from NIST photodiodes to stars, with a targeted accuracy of SI{1}{mmag} in $griz$ colors. We present the first two stages, resulting in the calibration transfer from NIST photodiodes to a demonstration SI{150}{Mpixel} CMOS sensor (Sony IMX411ALR as implemented in the QHY411M camera by QHYCCD). As a side-product, we provide full characterization of this camera. A fully automated spectrophotometric bench is built to perform the calibration transfer. The sensor readout electronics is studied using thousands of flat-field images from which we derive stability, high resolution photon transfer curves and estimates of the individual pixel gain. The sensor quantum efficiency is then measured relative to a NIST-calibrated photodiode. Flat-field scans at 16 different wavelengths are used to build maps of the sensor response. We demonstrate statistical uncertainty on quantum efficiency below SI{0.001}{e^-/gamma} between SI{387}{nm} and SI{950}{nm}. Systematic uncertainties in the bench optics are controlled at the level of SI{1e-3}{e^-/gamma}. Uncertainty in the overall normalization of the QE curve is 1%. Regarding the camera we demonstrate stability in steady state conditions at the level of SI{32.5}{ppm}. Homogeneity in the response is below SI{1}{percent} RMS across the entire sensor area. Quantum efficiency stays above SI{50}{percent} in most of the visible range, peaking well above SI{80}{percent} between SI{440}{nm} and SI{570}{nm}. Differential non-linearities at the level of SI{1}{percent} are detected. A simple 2-parameter model is proposed to mitigate the effect." @default.
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- W4308692923 date "2023-02-01" @default.
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- W4308692923 title "StarDICE" @default.
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- W4308692923 doi "https://doi.org/10.1051/0004-6361/202244973" @default.
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