Absolute calibration of soft x‐ray detectors (photocathodes, XUV photodiodes, thinned CCD, ...) with the synchrotron radiation of SUPER ACO at the LURE, Orsay

To interpret the experimental results in laser matter interaction experiments, the absolute spectral response of soft x‐ray detectors is often needed. For this purpose CEL‐V uses calibration lines of synchrotron radiation of SUPER‐ACO at the LURE. The energy of output photons can be selected from 50 eV to 1000 eV. The output photon flux is absolutely calibrated with a bolometer or a soft x‐ray photodiode. Then we measure the response of the studied detector installed at the same location. Measurements of quantum efficiencies of photocathodes (Al and CsI on Al) and of the response of a thinned CCD are presented versus photon energy.