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Search Results: 1 - 10 of 461838 matches for " A. Monfardini "
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INHIBITORY EFFECT OF BIOCIDES ON ENVIRONMENTAL S. AUREUS STRAINS
S. Monfardini,A. Traversa,A. Bellio,D. Adriano
Italian Journal of Food Safety , 2012, DOI: 10.4081/ijfs.2012.4.99
Abstract: The aim of this study was to evaluate the inhibitory effect of biocides on S.aureus strains isolated in dairy environment. After a contact time of 5' all tested molecules showed total growth inhibition of bacteria; for lower contact time results were depending on strains and biocides.
High-speed phonon imaging using frequency-multiplexed kinetic inductance detectors
L. J. Swenson,A. Cruciani,A. Benoit,M. Roesch,C. S. Yung,A. Bideaud,A. Monfardini
Physics , 2010, DOI: 10.1063/1.3459142
Abstract: We present a measurement of phonon propagation in a silicon wafer utilizing an array of frequency-multiplexed superconducting resonators coupled to a single transmission line. The electronic readout permits fully synchronous array sampling with a per-resonator bandwidth of 1.2 MHz, allowing sub-$\mu$s array imaging. This technological achievement is potentially vital in a variety of low-temperature applications, including single-photon counting, quantum-computing and dark-matter searches.
Investigation of peak shapes in the MIBETA experiment calibrations
E. Ferri,S. Kraft-Bermuth,A. Monfardini,A. Nucciotti,D. Schaeffer,M. Sisti
Physics , 2012, DOI: 10.1140/epja/i2012-12131-5
Abstract: In calorimetric neutrino mass experiments, where the shape of a beta decay spectrum has to be precisely measured, the understanding of the detector response function is a fundamental issue. In the MIBETA neutrino mass experiment, the X-ray lines measured with external sources did not have Gaussian shapes, but exhibited a pronounced shoulder towards lower energies. If this shoulder were a general feature of the detector response function, it would distort the beta decay spectrum and thus mimic a non-zero neutrino mass. An investigation was performed to understand the origin of the shoulder and its potential influence on the beta spectrum. First, the peaks were fitted with an analytic function in order to determine quantitatively the amount of events contributing to the shoulder, also depending on the energy of the calibration X-rays. In a second step, Montecarlo simulations were performed to reproduce the experimental spectrum and to understand the origin of its shape. We conclude that at least part of the observed shoulder can be attributed to a surface effect.
In-situ measurement of the permittivity of helium using microwave NbN resonators
G. J. Grabovskij,L. J. Swenson,O. Buisson,C. Hoffmann,A. Monfardini,J. -C. Villégier
Physics , 2008, DOI: 10.1063/1.2996263
Abstract: By measuring the electrical transport properties of superconducting NbN quarter-wave resonators in direct contact with a helium bath, we have demonstrated a high-speed and spatially sensitive sensor for the permittivity of helium. In our implementation a $\sim10^{-3}$ mm$^3$ sensing volume is measured with a bandwidth of 300 kHz in the temperature range 1.8 to 8.8 K. The minimum detectable change of the permittivity of helium is calculated to be $\sim6\times$$10^{-11}$ $\epsilon_0$/Hz$^{1/2}$ with a sensitivity of order $10^{-13}$ $\epsilon_0$/Hz$^{1/2}$ easily achievable. Potential applications include operation as a fast, localized helium thermometer and as a transducer in superfluid hydrodynamic experiments.
High-energy interactions in Kinetic Inductance Detectors arrays
A. D'Addabbo,M. Calvo,J. Goupy,A. Benoit,O. Bourrion,A. Catalano,J. F. Macias-Perez,A. Monfardini
Physics , 2015, DOI: 10.1117/12.2056441
Abstract: The impacts of Cosmic Rays on the detectors are a key problem for space-based missions. We are studying the effects of such interactions on arrays of Kinetic Inductance Detectors (KID), in order to adapt this technology for use on board of satellites. Before proposing a new technology such as the Kinetic Inductance Detectors for a space-based mission, the problem of the Cosmic Rays that hit the detectors during in-flight operation has to be studied in detail. We present here several tests carried out with KID exposed to radioactive sources, which we use to reproduce the physical interactions induced by primary Cosmic Rays, and we report the results obtained adopting different solutions in terms of substrate materials and array geometries. We conclude by outlining the main guidelines to follow for fabricating KID for space-based applications.
Uniform non-stoichiometric titanium nitride thin films for improved kinetic inductance detector array
G. Coiffard,K-F. Schuster,E. F. C. Driessen,S. Pignard,M. Calvo,A. Catalano,J. Goupy,A. Monfardini
Physics , 2015,
Abstract: We describe the fabrication of homogeneous sub-stoichiometric titanium nitride films for microwave kinetic inductance detector (mKID) arrays. Using a 6 inch sputtering target and a homogeneous nitrogen inlet, the variation of the critical temperature over a 2 inch wafer was reduced to <25 %. Measurements of a 132-pixel mKID array from these films reveal a sensitivity of 16 kHz/pW in the 100 GHz band, comparable to the best aluminium mKIDs. We measured a noise equivalent power of NEP = 3.6e-15 Hz/Hz^(1/2). Finally, we describe possible routes to further improve the performance of these TiN mKID arrays.
Electronics and data acquisition demonstrator for a kinetic inductance camera
O. Bourrion,A. Bideaud,A. Benoit,A. Cruciani,J. F. Macias-Perez,A. Monfardini,M. Roesch,L. Swenson,C. Vescovi
Physics , 2011, DOI: 10.1088/1748-0221/6/06/P06012
Abstract: A prototype of digital frequency multiplexing electronics allowing the real time monitoring of kinetic inductance detector (KIDs) arrays for mm-wave astronomy has been developed. It requires only 2 coaxial cables for instrumenting a large array. For that, an excitation comb of frequencies is generated and fed through the detector. The direct frequency synthesis and the data acquisition relies heavily on a large FPGA using parallelized and pipelined processing. The prototype can instrument 128 resonators (pixels) over a bandwidth of 125 MHz. This paper describes the technical solution chosen, the algorithm used and the results obtained.
Niobium Silicon alloys for Kinetic Inductance Detectors
M. Calvo,A. D'Addabbo,A. Monfardini,A. Benoit,N. Boudou,O. Bourrion,A. Catalano,L. Dumoulin,J. Goupy,H. Le Sueur,S. Marnieros
Physics , 2013, DOI: 10.1007/s10909-013-1072-6
Abstract: We are studying the properties of Niobium Silicon amorphous alloys as a candidate material for the fabrication of highly sensitive Kinetic Inductance Detectors (KID), optimized for very low optical loads. As in the case of other composite materials, the NbSi properties can be changed by varying the relative amounts of its components. Using a NbSi film with T_c around 1 K we have been able to obtain the first NbSi resonators, observe an optical response and acquire a spectrum in the band 50 to 300 GHz. The data taken show that this material has very high kinetic inductance and normal state surface resistivity. These properties are ideal for the development of KID. More measurements are planned to further characterize the NbSi alloy and fully investigate its potential.
Lumped element kinetic inductance detectors maturity for space-borne instruments in the range between 80 and 180~GHz
A. Catalano,A. Benoit,O. Bourrion,M. Calvo,G. Coiffard,A. D'Addabbo,J. Goupy,H. Le Sueur,J. Macìas-Pérez,A. Monfardini
Physics , 2015,
Abstract: This work intends to give the state-of-the-art of our knowledge of the performance of LEKIDs at millimetre wavelengths (from 80 to 180~GHz). We evaluate their optical sensitivity under typical background conditions and their interaction with ionising particles. Two LEKID arrays, originally designed for ground-based applications and composed of a few hundred pixels each, operate at a central frequency of 100, and 150~GHz ($\Delta \nu / \nu$ about 0.3). Their sensitivities have been characterised in the laboratory using a dedicated closed-circle 100~mK dilution cryostat and a sky simulator, allowing for the reproduction of realistic, space-like observation conditions. The impact of cosmic rays has been evaluated by exposing the LEKID arrays to alpha particles ($^{241}$Am) and X sources ($^{109}$Cd) with a readout sampling frequency similar to the ones used for Planck HFI (about 200~Hz), and also with a high resolution sampling level (up to 2~MHz) in order to better characterise and interpret the observed glitches. In parallel, we have developed an analytical model to rescale the results to what would be observed by such a LEKID array at the second Lagrangian point.
High speed readout electronics development for frequency-multiplexed kinetic inductance detector design optimization
O. Bourrion,C. Vescovi,A. Catalano,M. Calvo,A. D'Addabbo,J. Goupy,N. Boudou,J. F. Macias-Perez,A. Monfardini
Physics , 2013, DOI: 10.1088/1748-0221/8/12/C12006
Abstract: Microwave Kinetic Inductance Detectors (MKID) are a promising solution for spaceborne mm-wave astronomy. To optimize their design and make them insensitive to the ballistic phonons created by cosmic-ray interactions in the substrate, the phonon propagation in silicon must be studied. A dedicated fast readout electronics, using channelized Digital Down Conversion for monitoring up to 12 MKIDs over a 100MHz bandwidth was developed. Thanks to the fast ADC sampling and steep digital filtering, In-phase and Quadrature samples, having a high dynamic range, are provided at ~2 Msps. This paper describes the technical solution chosen and the results obtained.
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