Letteratura scientifica selezionata sul tema "Instrumentation cryogénique"
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Tesi sul tema "Instrumentation cryogénique":
Prêle, Damien. "Instrumentation cryogénique bas bruit et large bande en technologie SiGe". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2006. http://tel.archives-ouvertes.fr/tel-00332421.
Pedurand, Richard. "Instrumentation for Thermal Noise Spectroscopy". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1356.
The resolution limit of gravitational wave interferometers is set by their mirrors' Brownian motion – or thermal noise - in the central part of their detection band, from 10Hz to 1kHz. This thermal noise frequency distribution is given by the mechanical energy dissipation mechanisms it originates from, in agreement with the fluctuation-dissipation theorem. This dissipation mainly derives from the optical coatings deposited on the mirrors to give them their reflectivity. To reduce this thermal noise, a new generation of gravitational wave detectors employing mirrors cooled to cryogenic temperature has been suggested. The development of new optical thin-film materials with low mechanical dissipation, operating at both room and cryogenic temperatures, therefore requires new experimental tools. The main object of this thesis is the construction of a new instrument, the CryoQPDI, which is an association between a high-resolution interferometer and a cryostat based on a pulse tube cooler. It can directly measure the Brownian motion of a microcantilever between 300 K and 7 K. By combining measurements made on a microcantilever before and after the deposition of a thin film, it is possible to characterize the internal mechanical dissipation of this thin film. This instrument will eventually contribute to the optimisation of optical coatings of future gravitational wave detectors, aiming at minimizing the limitations due to thermal noise
Goutailler, Florent. "Polarisation dynamique nucléaire a basse température et fort champ magnétique pour des applications biomédicales en imagerie spectroscopique par résonance magnétique". Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00684287.
Volpe, Angela. "Développement d'un réfrigérateur à dilution en boucle fermée pour expériences d'astrophysique dans l'espace". Phd thesis, Université de Grenoble, 2014. http://tel.archives-ouvertes.fr/tel-00993970.
Grockowiak, Audrey. "Supraconductivité et propriétés physiques du silicium très fortement dopé". Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00858585.
Florea, Ovidiu. "Développement d'un magnétomètre nanofabriqué très basse température (30 mK) et fort champ magnétique (16 T) : étude de nouveaux états magnétiques apparaissant dans les nanoaimants frustrés". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY061/document.
The objective of this work was to develop a Faraday force magnetometer to measureabsolute values of the magnetization at very low temperatures (30 mK) andhigh applied magnetic fields (16 T) with a high sensitivity (10-5 emu). This magnetometer will be especially dedicated to the study of the field induced properties of frustrated magnets.In a first part, I present the development of this magnetometer. It involves the optimization of the dilution refrigerator and field gradient coils, and the development of a capacitive detection with a cold amplifier stage to improve the measurement sensitivity. Preliminary magnetic measurements are shown. The changes in the design required to make the magnetometer operational are discussed.In a second part, I focus on experimental studies of frustrated magnets: Gadolinium garnets, described by classical spins, and Copper based frustrated molecular compounds, to probe quantum effects. These measurements were performed from 70 mK to 300 K, with the existing magnetometers at the Institut Neel.In Gd3Ga5O12, we have complemented the H-T phase diagram. This phase diagram was proven to be robust by our study on the isomorphous compound, Gd3Al5O12. We evidence the convergence of all the observed phases to a unique point in both samples.In quantum systems, we performed preliminary studies on Cu44 clusters with tetrahedral motives, and on a triangular system Cu3. Although promising, these studies were not pursued due to sample problems
MADET, Karine. "Mesure du rayonnement cosmologique : Préparation et étalonnage des instruments Archeops et Planck". Phd thesis, 2002. http://tel.archives-ouvertes.fr/tel-00004190.
Capitoli di libri sul tema "Instrumentation cryogénique":
Bosseboeuf, Alain, Pierre Etienne Allain, Fabien Parrain, Serge Jacob, Alexis Poisat, Nathalie Isac, Sylvain Perrot e Arnaud Walther. "Système de flexion 4 points de puce semiconductrice pour une station sous pointes cryogénique". In Instrumentation et Interdisciplinarité, 307–14. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1206-6-039.
Bosseboeuf, Alain, Pierre Etienne Allain, Fabien Parrain, Serge Jacob, Alexis Poisat, Nathalie Isac, Sylvain Perrot e Arnaud Walther. "Système de flexion 4 points de puce semiconductrice pour une station sous pointes cryogénique". In Instrumentation et Interdisciplinarité, 307–14. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1206-6.c039.