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Dive into the research topics where Jean-Christophe Salvignol is active.

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Featured researches published by Jean-Christophe Salvignol.


Proceedings of SPIE | 2010

VIS: the visible imager for Euclid

Mark Cropper; Sabrina Pottinger; S. Niemi; J. Denniston; R. Cole; Magdalena B. Szafraniec; Y. Mellier; Michel Berthe; J. Martignac; C. Cara; A. M. di Giorgio; A. Sciortino; S. Paltani; L. Genolet; J.-J. Fourmand; M. Charra; P. Guttridge; B. Winter; James Endicott; Andrew D. Holland; Jason Gow; Neil J. Murray; David J. Hall; Jérôme Amiaux; R. J. Laureijs; Giuseppe Racca; Jean-Christophe Salvignol; A. Short; J. Lorenzo Alvarez; Thomas D. Kitching

Euclid-VIS is the large format visible imager for the ESA Euclid space mission in their Cosmic Vision program, scheduled for launch in 2020. Together with the near infrared imaging within the NISP instrument, it forms the basis of the weak lensing measurements of Euclid. VIS will image in a single r+i+z band from 550-900 nm over a field of view of ~0.5 deg2. By combining 4 exposures with a total of 2260 sec, VIS will reach to deeper than mAB=24.5 (10σ) for sources with extent ~0.3 arcsec. The image sampling is 0.1 arcsec. VIS will provide deep imaging with a tightly controlled and stable point spread function (PSF) over a wide survey area of 15000 deg2 to measure the cosmic shear from nearly 1.5 billion galaxies to high levels of accuracy, from which the cosmological parameters will be measured. In addition, VIS will also provide a legacy dataset with an unprecedented combination of spatial resolution, depth and area covering most of the extra-Galactic sky. Here we will present the results of the study carried out by the Euclid Consortium during the period up to the Critical Design Review.


Proceedings of SPIE | 2007

Overview of the near-infrared spectrograph (NIRSpec) instrument on-board the James Webb Space Telescope (JWST)

Giorgio Bagnasco; Manfred Kolm; Pierre Ferruit; Karl Honnen; Jess Koehler; Robert Lemke; Marc Maschmann; Markus Melf; George Noyer; Peter Rumler; Jean-Christophe Salvignol; Paolo Strada; Maurice te Plate

The James Webb Space Telescope (JWST) mission is a collaborative project between the National Aeronautics and Space Administration (NASA), the European Space Agency (ESA) and the Canadian Space Agency (CSA). JWST is considered the successor to the Hubble Space Telescope (HST) and although its design and science objectives are quite different, JWST is expected to yield equivalently astonishing breakthroughs in infrared space science. Due to be launched in 2013 from the French Guiana, the JWST observatory will be placed in an orbit around the anti- Sun Earth-Sun Lagrangian point, L2, by an Ariane 5 launcher, provided by ESA. The payload on board the JWST observatory consists of four main scientific instruments: a near-infrared camera (NIRCam), a combined mid-infrared camera/spectrograph (MIRI), a near-infrared tunable filter (TFI) and a nearinfrared spectrograph (NIRSpec). The instrument suite is completed by a Fine Guidance Sensor (FGS). Besides the provision of the Ariane 5 launcher, ESA, with EADS Astrium GmbH (D) as Prime Contractor, is fully responsible for the funding and the furnishing of NIRSpec and, at the same time, for approximately half of MIRI costs through special contributions from the ESA member states. NIRSpec is a multi-object, spectrograph capable of measuring the spectra of about 100 objects simultaneously at low (R=100), medium (R=1000), and high (R=2700) resolutions over the wavelength range between 0.6 micron and 5.0 micron. In this article we provide a general overview of its main design features and performances.


Proceedings of SPIE | 2012

The JWST near-infrared spectrograph NIRSpec: status

Pierre Ferruit; Giorgio Bagnasco; Reiner Barho; Stephan M. Birkmann; Torsten Böker; Guido De Marchi; Bernhard Dorner; Ralf Ehrenwinkler; Massimo Falcolini; Giovanna Giardino; Xavier Gnata; Karl Honnen; Peter Viggo Jakobsen; Peter Jensen; Manfred Kolm; Hans-Ulrich Maier; Ralf Maurer; Markus Melf; Peter Mosner; Peter Rumler; Jean-Christophe Salvignol; Marco Sirianni; Paolo Strada; Maurice te Plate; Thomas Wettemann

The Near-Infrared Spectrograph NIRSpec is one of the four instruments of the James Webb Space Telescope (JWST). NIRSpec will cover the 0.6-5.0 micron range and will be capable of obtaining spectra of more than 100 objects simultaneously in its multi-object spectroscopy (MOS) mode. It also features a set of slits and an aperture for high contrast spectroscopy of individual sources, as well as an integral-field unit (IFU) for 3D spectroscopy. We will first show how these capabilities are linked to the four main JWST scientific themes. We will then give an overview of the NIRpec modes and spectral configurations with an emphasis on the layout of the field of view and of the spectra. Last, we will provide an update on the status of the instrument.


Proceedings of SPIE | 2016

The Euclid mission design

Giuseppe D. Racca; R. J. Laureijs; Luca Stagnaro; Jean-Christophe Salvignol; Jose Lorenzo Alvarez; Gonzalo Saavedra Criado; Luis Gaspar Venancio; Alex Short; Paolo Strada; Tobias Bönke; Cyril Colombo; Adriano Calvi; Elena Maiorano; Osvaldo Piersanti; Sylvain Prezelus; Pierluigi Rosato; Jacques Pinel; Hans Rozemeijer; Valentina Lesna; Paolo Musi; Marco Sias; Alberto Anselmi; Vincent Cazaubiel; Ludovic Vaillon; Y. Mellier; Jérôme Amiaux; Michel Berthé; Marc Sauvage; Ruyman Azzollini; Mark Cropper

Euclid is a space-based optical/near-infrared survey mission of the European Space Agency (ESA) to investigate the nature of dark energy, dark matter and gravity by observing the geometry of the Universe and on the formation of structures over cosmological timescales. Euclid will use two probes of the signature of dark matter and energy: Weak gravitational Lensing, which requires the measurement of the shape and photometric redshifts of distant galaxies, and Galaxy Clustering, based on the measurement of the 3-dimensional distribution of galaxies through their spectroscopic redshifts. The mission is scheduled for launch in 2020 and is designed for 6 years of nominal survey operations. The Euclid Spacecraft is composed of a Service Module and a Payload Module. The Service Module comprises all the conventional spacecraft subsystems, the instruments warm electronics units, the sun shield and the solar arrays. In particular the Service Module provides the extremely challenging pointing accuracy required by the scientific objectives. The Payload Module consists of a 1.2 m three-mirror Korsch type telescope and of two instruments, the visible imager and the near-infrared spectro-photometer, both covering a large common field-of-view enabling to survey more than 35% of the entire sky. All sensor data are downlinked using K-band transmission and processed by a dedicated ground segment for science data processing. The Euclid data and catalogues will be made available to the public at the ESA Science Data Centre.


Proceedings of SPIE | 2014

The Euclid VIS CCD detector design, development, and programme status

Alex Short; D Barry; Michel Berthe; N Boudin; Olivier Boulade; R. Cole; Mark Cropper; Ludovic Duvet; James Endicott; L. M. Gaspar Venancio; Jason Gow; P. Guttridge; David J. Hall; Andrew D. Holland; Holger Israel; Ralf Kohley; R. J. Laureijs; J. Lorenzo Alvarez; J. Martignac; J Maskell; Richard Massey; Neil J. Murray; S. Niemi; Peter J. Pool; Sabrina Pottinger; Thibaut Prod'homme; Giuseppe Racca; Jean-Christophe Salvignol; W Suske; Magdalena B. Szafraniec

The focal plane array of the Euclid VIS instrument comprises 36 large area, back-illuminated, red-enhanced CCD detectors (designated CCD 273). These CCDs were specified by the Euclid VIS instrument team in close collaboration with ESA and e2v technologies. Prototypes were fabricated and tested through an ESA pre-development activity and the contract to qualify and manufacture flight CCDs is now underway. This paper describes the CCD requirements, the design (and design drivers) for the CCD and package, the current status of the CCD production programme and a summary of key performance measurements.


Proceedings of SPIE | 2014

Euclid mission status

R. J. Laureijs; Giuseppe Racca; Luca Stagnaro; Jean-Christophe Salvignol; J. Lorenzo Alvarez; G. Saavedra Criado; L. M. Gaspar Venancio; A. Short; Paulo Strada; C. Colombo; Guillermo Buenadicha; John Hoar; Ralf Kohley; Roland Vavrek; Y. Mellier; Michel Berthe; Jérôme Amiaux; Mark Cropper; S. Niemi; Sabrina Pottinger; A. Ealet; Knud Jahnke; Thierry Maciaszek; F. Pasian; M. Sauvage; Stefanie Wachter; U. Israelsson; Warren Holmes; M. Seiffert; V. Cazaubiel

In June 2012, Euclid, ESAs Cosmology mission was approved for implementation. Afterwards the industrial contracts were signed for the payload module and the spacecraft prime, and the mission requirements consolidated. We present the status of the mission in the light of the design solutions adopted by the contractors. The performances of the spacecraft in its operation, the telescope assembly, the scientific instruments as well as the data-processing have been carefully budgeted to meet the demanding scientific requirements. We give an overview of the system and where necessary the key items for the interfaces between the subsystems.


Proceedings of SPIE | 2008

JWST NIRSpec mechanical design

Jean-Christophe Salvignol; Karl Honnen; Reiner Barho

The James Webb Space Telescope (JWST) mission is a collaborative project between the National Aeronautics and Space Administration (NASA), the European Space Agency (ESA) and the Canadian Space Agency (CSA) and is considered as the successor to the Hubble Space Telescope (HST). The European contribution consists in providing the Ariane 5 launcher and two out of the four instruments: a combined mid-infrared camera/spectrograph (MIRI) and a near infrared spectrograph (NIRSpec). This article will address the mechanical aspects of NIRSpec by providing an overview of the design drivers and the related solutions for the structure, the thermal design and the mechanisms so as to achieve the required stringent optical performances. The industrial set-up and the project development status will also be presented.


Proceedings of SPIE | 2008

High-precision cryogenic wheel mechanisms for the JWST NIRSpec instrument

Kai Weidlich; Manfred Fischer; Marc M. Ellenrieder; Torsten Gross; Jean-Christophe Salvignol; Reiner Barho; Christian Neugebauer; Günter Königsreiter; Michael Trunz; Friedrich Müller; O. Krause

The Grating and Filter Wheel Mechanisms of the JWST NIRSpec instrument allow for reconfiguration of the spectrograph in space in a number of NIR sub-bands and spectral resolutions. Challenging requirements need to be met simultaneously including high launch loads, the large temperature shift to cryo-space, high position repeatability and minimum deformation of the mounted optics. The design concept of the NIRSpec wheel mechanisms is based on the ISOPHOT Filter Wheels but with significant enhancements to support much larger optics. A well-balanced set of design parameters was to be found and a considerable effort was spent to adjust the hardware within narrow tolerances.


Proceedings of SPIE | 2012

The accuracy of the NIRSpec grating wheel position sensors

Guido De Marchi; Stephan M. Birkmann; Torsten Böker; Pierre Ferruit; Giovanna Giardino; Marco Sirianni; Martin Stuhlinger; Maurice te Plate; Jean-Christophe Salvignol; Reiner Barho; Xavier Gnata; Robert Lemke; Michel Kosse; Peter Mosner

We present a detailed analysis of measurements collected during the first ground-based cryogenic calibration campaign of NIRSpec, the Near-Infrared Spectrograph for the James Webb Space Telescope (JWST). In this paper we concentrate on the performances of the NIRSpec grating wheel, showing that the magneto-resistive position sensors installed on the wheel provide very accurate information on the position of the wheel itself, thereby enabling an efficient acquisition of the science targets and a very accurate extraction and calibration of their spectra.


Proceedings of SPIE | 2010

Status of the NIRSpec instrument

Stephan M. Birkmann; Torsten Böker; Peter Jakobsen; Guido De Marchi; Marco Sirianni; Giorgio Bagnasco; Peter Jensen; Maurice te Plate; Peter Rumler; Jean-Christophe Salvignol; Paolo Strada; Manfred Kolm; Xavier Gnata; Karl Honnen; Jess Köhler; Robert Lemke; Marc Maschmann; Markus Melf; Jean-François Pittet; P. Ferruit; Bernhard Dorner

The Near Infrared Spectrograph (NIRSpec) is one of the four science instruments aboard the James Webb Space Telescope (JWST) scheduled for launch in 2014. NIRSpec is sensitive in the wavelength range from ~ 0.6 to 5.0 μm and will be capable of obtaining spectra of more than a 100 objects simultaneously, as well as fixed slit high contrast spectroscopy of individual sources. It also features an integral field unit for 3D spectroscopy. The key scientific objectives of the instrument include studies of star formation and chemical abundances of young distant galaxies and tracing the creation of the chemical elements back in time. In this paper, we present the status of the NIRSpec instrument as it is currently being prepared for its extensive ground calibration campaign later in 2010.

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Paolo Strada

European Space Research and Technology Centre

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Y. Mellier

Institut d'Astrophysique de Paris

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Eric Prieto

Aix-Marseille University

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