000006732 001__ 6732
000006732 005__ 20240205140858.0
000006732 0247_ $$2DOI$$a  10.48550/arXiv.2307.14182 
000006732 037__ $$aSCART-2024-0067
000006732 100__ $$aGissot, S. 
000006732 245__ $$aInitial radiometric calibration of the High-Resolution EUV Imager ( HRIEUV ) of the Extreme Ultraviolet Imager (EUI) instrument onboard Solar Orbiter
000006732 260__ $$c2023
000006732 520__ $$aThe HRIEUV telescope was calibrated on ground at the Physikalisch-Technische Bundesanstalt (PTB), Germany's national metrology institute, using the Metrology Light Source (MLS) synchrotron in April 2017 during the calibration campaign of the Extreme Ultraviolet Imager (EUI) instrument onboard the Solar Orbiter mission. We use the pre-flight end-to-end calibration and component-level (mirror multilayer coatings, filters, detector) characterization results to establish the beginning-of-life performance of the HRIEUV telescope which shall serve as a reference for radiometric analysis and monitoring of the telescope in-flight degradation. Calibration activities at component level and end-to-end calibration of the instrument were performed at PTB/MLS synchrotron light source (Berlin, Germany) and the SOLEIL synchrotron. Each component optical property is measured and compared to its semi-empirical model. This pre-flight characterization is used to estimate the parameters of the semi-empirical models. The end-to-end response is measured and validated by comparison with calibration measurements, as well as with its main design performance requirements. The telescope spectral response semi-empirical model is validated by the pre-flight end-to-end ground calibration of the instrument. It is found that HRIEUV is a highly efficient solar EUV telescope with a peak efficiency superior to 1 e−.ph−1), low detector noise (≈ 3 e- rms), low dark current at operating temperature, and a pixel saturation above 120 ke- in low-gain or combined image mode. The ground calibration also confirms a well-modeled spectral selectivity and rejection, and low stray light. The EUI instrument achieves state-of-the-art performance in terms of signal-to-noise and image spatial resolution.
000006732 594__ $$aSTCE
000006732 6531_ $$aEUI
000006732 6531_ $$aHRIEUV
000006732 6531_ $$acalibration
000006732 6531_ $$acorona
000006732 700__ $$aAuchère, F.  
000006732 700__ $$aBerghmans, D. 
000006732 700__ $$aBenMoussa, A. 
000006732 700__ $$aRebellato, J. 
000006732 700__ $$aHarra, L. 
000006732 700__ $$aLong, D.  
000006732 700__ $$aRochus, P. 
000006732 700__ $$aSchühle, U. 
000006732 700__ $$aAznar Cuadrado, R.
000006732 700__ $$aDelmotte, F.
000006732 700__ $$aDumesnil, C. 
000006732 700__ $$aGottwald, A.
000006732 700__ $$aHalain, J. -P. 
000006732 700__ $$aHeerlein, K. 
000006732 700__ $$aHellin, M. -L. 
000006732 700__ $$aHermans, A
000006732 700__ $$aJacques, L.
000006732 700__ $$aKraaikamp, E.  
000006732 700__ $$aMercier, R.
000006732 700__ $$aRochus, P.
000006732 700__ $$aSmith, P.J.
000006732 700__ $$aTeriaca, L.
000006732 700__ $$aVerbeeck, C.
000006732 773__ $$pArxiv$$y2023
000006732 8560_ $$fdavid.berghmans@ksb-orb.be
000006732 85642 $$ahttps://ui.adsabs.harvard.edu/link_gateway/2023arXiv230714182G/EPRINT_PDF
000006732 85642 $$ahttps://arxiv.org/abs/2307.14182
000006732 905__ $$apublished in
000006732 980__ $$aNONREF