A5056040646- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Calibration and Measurement Techniques
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Infrared Target Detection Methodologies
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Atmospheric Ozone and Climate
- Pulsars and Gravitational Waves Research
- Satellite Image Processing and Photogrammetry
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Electron and X-Ray Spectroscopy Techniques
- Psychoanalysis and Psychopathology Research
- History and Developments in Astronomy
- Economic Growth and Productivity
- Sensor Technology and Measurement Systems
- Particle Accelerators and Free-Electron Lasers
Laboratoire de Physique Nucléaire et de Hautes Énergies
2014-2024
Centre National de la Recherche Scientifique
2007-2024
Sorbonne Université
2007-2024
Institut National de Physique Nucléaire et de Physique des Particules
2007-2024
Université Paris Cité
2007-2024
Durham University
2023
TU Dortmund University
2023
University of Łódź
2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2023
University of Turku
2023
The science focal plane of the Large Synoptic Survey Telescope is made up 21 modules designated "raft towers". Each raft tower module (RTM) an autonomous, fully-testable and serviceable 144 Mpixel imager consisting nine highly-segmented CCDs with complete readout electronics chain. To minimize noise obscuration RTM housed in a compact enclosure fully contained within camera cryostat. required to meet strict performance goals for image flatness, speed, noise, power dissipation. Key components...
We present two lines of ASICs dedicated to the control and readout CCD sensors. The CABAC (Clocks And Biases ASIC for CCDs) provides all required bias voltages clocks. ASPIC (Analog Signal Processing Integrated Circuit) processes 8 output channels: amplification, Correlated Double Sampling, conversion differential signal. Both chips are highly configurable in order fulfill a wide range astronomical needs, from fast wide-field imaging arrays slower speeds higher gains spectroscopy. Their...
The Photon Transfer Curve (PTC) of a CCD depicts the variance uniform images as function their average. It is now well established that not proportional to average, Poisson statistics would indicate, but rather flattens out at high flux. This "variance deficit", related brighter-fatter effect, feeds correlations between nearby pixels, increase with flux, and decay distance. We propose an analytical expression for PTC shape, dependence intensity, relate both some more basic quantities...
The Hubble diagram of type-Ia supernovae (SNe-Ia) provides cosmological constraints on the nature dark energy with an accuracy limited by flux calibration currently available spectrophotometric standards. StarDICE experiment aims at establishing a 5-stage metrology chain from NIST photodiodes to stars, targeted \SI{1}{mmag} in $griz$ colors. We present first two stages, resulting transfer demonstration \SI{150}{Mpixel} CMOS sensor (Sony IMX411ALR as implemented QHY411M camera QHYCCD). As...
The Integration and Verification Testing of the Large Synoptic Survey Telescope (LSST) Camera is described. LSST will be largest astronomical camera ever constructed, featuring a 3.2 giga-pixel focal plane mosaic 189 CCDs with in-vacuum controllers readout, dedicated guider wavefront CCDs, three element corrector 1.6-meter diameter initial optic, six optical filters covering wavelengths from 320 to 1000 nm novel filter exchange mechanism, camera-control data acquisition capable digitizing...
Aims. We describe the design, operation, and first results of a photometric calibration project, called DICE (Direct Illumination Calibration Experiment), aiming at achieving precise instrumental optical telescopes. The heart is an illumination device composed 24 narrow-spectrum, high-intensity, light-emitting diodes (LED) chosen to cover ultraviolet-to-near-infrared spectral range. It implements point-like source placed finite distance from telescope entrance pupil, yielding flat field that...
We present the first results of SuperNova Direct Illumination Calibration Experiment (SNDICE), installed in January 2008 at Canada France Hawaii Telescope. SNDICE is designed for absolute calibration instrumental response a telescope general, and control systematic errors Legacy Survey (SNLS) on Megacam particular. Since photometric will critical ingredient cosmological future experiments involving instruments with large focal planes (like SNAP, LSST DUNE), functions also as real-size...
Tearing patterns affecting flat-field frames in charge-coupled devices are a visually striking obstacle to performing pixel response nonuniformity (PRNU) corrections. These can be explained by lateral field distortions, caused the nonuniform distribution of holes channel stops between sensor columns. Over course Large Synoptic Survey Telescope camera development, number practical fixes have been suggested get rid tearing. However, applying these our 16-channel Teledyne-e2v sensors leaves at...
The LSST camera will have more than 3000 video-processing channels. readout of this large focal plane requires a very compact chain. correlated ''Double Sampling technique'', which is generally used for the signal CCDs, also adopted application and implemented with so called ''Dual Slope integrator'' method.
For several years, a group of engineers and physicists from LAL LPNHE have been working on the design two front end ASICs dedicated to Charge Couple Devices (CCD). ASPIC (Analogue Signal Processing Integrated Circuit), designed in AMS CMOS 0.35 μm 5V technology, is meant readout process analog signals CCDs. CABAC (Clocks And Biases ASIC for CCDs), 50V produces clocks biases needed by CCDs work at their full potential. This paper presents performances final versions these ASICs.
The Hubble diagram of type-Ia supernovae (SNe-Ia) provides cosmological constraints on the nature dark energy with an accuracy limited by flux calibration currently available spectrophotometric standards. StarDICE experiment aims at establishing a 5-stage metrology chain from NIST photodiodes to stars, targeted \SI{1}{mmag} in $griz$ colors. We present first two stages, resulting transfer demonstration \SI{150}{Mpixel} CMOS sensor (Sony IMX411ALR as implemented QHY411M camera QHYCCD). As...
The StarDICE experiment strives to establish an instrumental metrology chain with a targeted accuracy of 1 mmag in griz bandpasses meet the calibration requirements next-generation cosmological surveys. Atmospheric transmission is significant source systematic uncertainty. We propose solution relying on uncooled infrared thermal camera evaluate gray extinction variations. However, achieving accurate measurements imaging systems necessitates prior due temperature-induced effects, compromising...
The StarDICE experiment strives to establish an instrumental metrology chain with a targeted accuracy of 1 mmag in griz bandpasses meet the calibration requirements next-generation cosmological surveys. Atmospheric transmission stands out as significant source systematic uncertainty. Specifically, gray extinction induces spurious variations photometric fluxes. We propose solution relying on uncooled long-wave infrared thermal camera evaluate it. This type can provide real-time insights into...
The LSST Camera for the Vera C. Rubin Observatory has been constructed at SLAC National Accelerator Laboratory. covers a 3.5-degree field of view with 3.2 gigapixels. goal survey is to provide well-understood astronomical source catalog community. Camera's focal plane populated by 189 sensors on science that are combination E2V CCD250 and ITL STA3800 deep-depletion, back-illuminated devices, accompanying eight guide sensors, four wavefront sensors. Nine grouped as "Raft" three identical...
Context. In the next decade, many optical surveys will aim to answer question of nature dark energy by measuring its equation-of-state parameter at per mill level. This requires trusting photometric calibration survey with a precision never reached so far on sources systematic uncertainties. The measurement on-site atmospheric transmission for each exposure, or season full average, can help reach magnitudes. Aims. work aims proving ability use slitless spectroscopy standard-star...
Dark Energy studies with type Ia supernovae set very tight constraints on the photometric calibration of imagers used to detect and follow up their flux variations. Among key challenges is measurement shape normalization instrumental throughput. The DICE system was developed by members Supernova Legacy Survey (SNLS), building upon lessons learnt working MegaCam imager. It consists in a stable light source, placed telescope enclosure, generating compact, conical beams, yielding an almost flat...
Electro-optical testing and characterization of the Vera C. Rubin Observatory Legacy Survey Space Time (LSST) Camera focal plane, consisting 205 charge-coupled devices (CCDs) arranged into 21 stand-alone Raft Tower Modules (RTMs) 4 Corner (CRTMs), is currently being performed at SLAC National Accelerator Laboratory. Testing camera sensors using a set custom-built optical projectors, designed to illuminate full plane or specific regions with series light illumination patterns: crosstalk...