Dr. Eric Kajfasz Profile

Dr. Eric Kajfasz

at Ctr de physique des particules de Marseille

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Publications (4)

Proceedings Article | 27 August 2024 Poster + Paper

Toward a universal characterization methodology for conversion gain measurement of CMOS APS: application to Euclid and SVOM

J. Le Graët, A. Secroun, M. Tourneur-Silvain, E. Kajfasz, J.-L. Atteia, O. Boulade, A. Nouvel de la Flèche, H. Geoffray, W. Gillard, S. Escoffier, F. Fortin, N. Fourmanoit, S. Kermiche, H. Valentin, J. Zoubian

Proceedings Volume 13103, 131031W (2024) https://doi.org/10.1117/12.3020095

KEYWORDS: Sensors, Quantum efficiency, Signal detection, Bias correction, CMOS sensors, Quantum measurement, Infrared detectors, Histograms, Infrared sensors, Error analysis

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Proceedings Article | 29 August 2022 Poster + Presentation + Paper

Euclid Near Infrared Spectro-Photometer: spatial considerations on H2RG detectors interpixel capacitance and IPC corrected conversion gain from on-ground characterization

J. Le Graët, A. Secroun, R. Barbier, W. Gillard, J.-C. Clémens, S. Conseil, S. Escoffier, S. Ferriol, N. Fourmanoit, E. Kajfasz, S. Kermiche, B. Kubik, G. Smadja, J. Zoubian

Proceedings Volume 12191, 121911M (2022) https://doi.org/10.1117/12.2628974

KEYWORDS: Sensors, Signal detection, Epoxies, Data conversion, Capacitance, Sensor performance, Quantum efficiency, Point spread functions, Galactic astronomy, Deconvolution, Infrared detectors, Astronomical detectors

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Proceedings Article | 29 August 2022 Presentation + Paper

Flux reconstruction for the NIR camera CAGIRE at the focus of the Colibrí Telescope

Alix Nouvel de la Flèche, Jean-Luc Atteia, Hervé Valentin, Marie Larrieu, Jérémie Boy, Olivier Gravrand, Olivier Boulade, Jean-Claude Clemens, Aurélia Secroun, Eric Kajfasz, Olivier Llido, Stéphane Basa, François Dolon, Johan Floriot, Simona Lombardo, Adrien Lamoure, Laurent Rubaldo, Bruno Fieque, Julien Roumegoux, Hervé Geoffray, Alan Watson, William Lee, Nathaniel Butler

Proceedings Volume 12191, 121910Q (2022) https://doi.org/10.1117/12.2627826

KEYWORDS: Sensors, Calibration, Astronomy, Telescopes, Near infrared, Cameras, Data acquisition, Stars, Signal detection, Readout integrated circuits

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CAGIRE is the near infrared camera of the Colibrí robotic telescope, designed for the follow-up of SVOM alerts, mainly Gamma Ray Bursts (GRBs), and the quick imaging of sky regions where transient sources are detected by the SVOM satellite. CAGIRE is based on the Astronomical Large Format Array (ALFA) 2k x 2k SWIR sensor from the French consortium CEA-LYNRED. In the context of CAGIRE the sensor is operated in “Up the Ramp” mode to observe the sky in a square field of view of 21.7 arcmin on a side, in the range of wavelengths from 1.1 to 1.8 μm. An observation with CAGIRE consists of a series of short (1-2 minutes) exposures during which the pixels are read out every 1.3 second, continuously accumulating charges proportionally to the received flux, building a ramp.

The main challenge is to quickly process and analyse these ramps, in order to identify and study the near infrared counterparts of the bursts, within 5 minutes of the reception of an alert. Our preprocessing, which is under development, aims at providing reliable flux maps for the astronomy pipeline. It is based on a sequence of operations. First, calibration maps are used to identify saturated pixels, and for each pixel, the usable (non saturated) range of the ramp. Then, the ramps are corrected for the electronic common mode noise, and differential ramps are constructed. Finally, the flux is calculated from the differential ramps, using a previously calibrated map of pixel non-linearities. We present here the sequence of operations performed by the preprocessing, which are based on previous calibrations of the sensor response. These operations lead to the production of a flux map corrected from cosmic-rays hits, a map depicting the quality of the fit, a map of saturated pixels and a map of pixels hit by cosmic-rays, before the acquisition of the next ramp. These maps will be used by the astronomy pipeline to quickly extract the scientific results of the observations, like the identification of uncatalogued or quickly variable sources that could be GRB afterglows.

Proceedings Article | 26 August 2022 Presentation + Paper

COLIBRI, a wide-field 1.3 m robotic telescope dedicated to the transient sky

Stéphane Basa, William Lee, François Dolon, Alan Watson, Johan Floriot, Jean-Luc Atteia, Nathaniel Butler, Damien Dornic, Simona Lombardo, Samuel Ronayette, Michel Ageron, François Agneray, Fernando Ángeles , Ludovik Bautista, Hafid Benamar-Aissa, Cyril Blanpain, Olivier Boulade, Jérémie Boy, Veronique Buat, Edgar Cadena, Salvador Cuevas, Alejandro Farah, Liliana Figueroa, Jorge Fuentes, Carole Gaïti, Pascal Gallais, Eric Kajfasz, Rosalía Langarica, Arthur Langlois, Marie Larrieu, Auguste Le Van Suu, Julien Lecubin, Eduardo López Ángeles, Erica Lugo, Adrien Malgoyre, Romain Mathon, Chrystel Moreau, Alix Nouvel-De-La-Flèche, José Luis Ochoa, Maria Pedrayes-López, Pascale Ramon, Jaime Ruíz-Díaz-Soto, Silvio Tinoco, Hervé Valentin

Proceedings Volume 12182, 121821S (2022) https://doi.org/10.1117/12.2627139

KEYWORDS: Telescopes, Observatories, Sensors, Robotics, Safety, Infrared radiation, Astronomy, Mirrors

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