17 research outputs found
Low Threshold Acquisition Controller for Skipper Charge Coupled Devices
Get PDFIn this work, the design and preliminary results of the first specially design Skipper-CCD controller, aimed for low threshold particle and astronomy experiments, is presented. The system integrates on a single board: the generation of the clock and bias signals for the sensor; four high-speed analog-to-digital converters to digitize the video channels of the CCD; Artix-7 FPGA to perform pixel calculation and board control; a front panel connector for all the signal inspection; and Ethernet port for full operation and data collection through standard network connection to a PC. The system has been fully tested and sample images were taken for both conventional and Skipper-CCDs.Fil: Fernández Moroni, Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; ArgentinaFil: Chierchie, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; ArgentinaFil: Sofo Haro, Miguel Francisco. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Stefanazzi, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; ArgentinaFil: Soto, Angel Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; ArgentinaFil: Paolini, Eduardo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; ArgentinaFil: Cancelo, Gustavo Indalecio Eugenio. Fermi National Accelerator Laboratory; Estados UnidosFil: Treptow, K.. Fermi National Accelerator Laboratory; Estados UnidosFil: Wilcer, N.. Fermi National Accelerator Laboratory; Estados UnidosFil: Zmuda, Ted. Fermi National Accelerator Laboratory; Estados UnidosFil: Estrada, Juan. Fermi National Accelerator Laboratory; Estados UnidosFil: Tiffenberg, Javier Sebastian. Fermi National Accelerator Laboratory; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina2019 Argentine Conference on Electronics - CAE2019Mar del PlataArgentinaUniversidad CAEC
Mitigation of pulse-width-modulation distortion using a digital predistorted based on memory polynomials
Get PDFThis paper presents an adaptive digital predistorter(DPD)that significantly reduces the baseband distortion of digital pulse width modulation (PWM), typically used in switching (class-D) amplifiers. A generalized Hammerstein structure (also known as power filter) composed by static nonlinearities and FIR filters is used to model the baseband behavior of PWM. We show that the contribution of the higher order terms of the nonlinearity are negligible and therefore, for practical applications, only the first three or four odd powers should be retained. The convergence of the DPD is studied and the performance is demonstrated and compared with other approaches. Good results are obtained for typical signals even when using low-orderFIR filters in the DPD. Measurement results obtained using a digital signal processor are also presented aiming to validate the proposed approach
La agricultura familiar en el área hortícola de La Plata, Berazategui y Florencio Varela: Diversas formas de dependencia y el camino de construcción de su autonomía
Get PDFLos horticultores familiares del Área Hortícola de La Plata, Berazategui y Florencio Varela, viven y trabajan en una situaciónde dependencia multicausal. La publicación que aquí se presenta analiza cómo esta condición se traduce en la situación de acceso y tenencia de la tierra, las formas de producción, sus estrategias de comercialización, la utilización de energías y la posibilidad de acceso al agua segura. Asimismo, plantea las alternativas posibles al sistema de producción intensivo, con amplia utilización de invernáculos. Presenta diferentes alternativas que sedesarrollan tanto desde el INTA, junto a otras instituciones, como desde organizaciones de productores, que coadyuvan a ladisminución de esa dependencia en pos de fortalecer la autonomía. El diagnóstico, como así también las alternativas productivas que aquí se presentan, fueron construidas a partir de fuentes bibliográficas, entrevistas semi-estructuradas en profundidad a informantes calificados y agricultores familiares de laregión, así como de resultados de investigaciones finalizadas (yalgunas en curso) de las diferentes líneas de investigación delIPAF Región Pampeana.Fil: Fingermann, Luciana. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Muscio, Luciana. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Hall, Marcos Fernando. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Perez, R.. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Pérez, Maximiliano. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Dumrauf, Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Giordano, Gabriel Alejandro. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Prividera, Guido. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: González, Edgardo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Justianovich, Sergio Hernan. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Muzi, M. E.. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Córdoba, Joaquín Alejandro. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Ocampo, F.. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Lavarello Herbin, Agustina. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Castro, A.. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Castro, A. S.. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Battista, Edurne. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Chierchie, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Novelli, M.. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Hang, Sofía. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria; Argentin
Skipper-CCD deployment inside a nuclear power plant
No full textIn light of the success of the Skipper-CCD technology used for Dark Matter searches [1], its extension to neutrino detection becomes natural. CCDs are being used for reactor neutrino experiments and they have already shown their potential in constraining new physics models [2]. The perspective of a Skipper-CCD experiment to look for standard and beyond standard model physics has been recently evaluated for different benchmark scenarios [3, 4]. Also, the shape of the background measured by a Skipper-CCD at ground level was exhaustively studied [5]. As a result, a uniform spectrum down to 5 electrons was observed, in tension with the excess observed by other experiments at such low energies [6]. The same Skipper-CCD was moved from Fermilab to Buenos Aires, Argentina, where it was installed inside the dome of Atucha II, a nuclear power reactor 100 km north of Buenos Aires City. This system, composed of a single Skipper-CCD of 0.675 gr effective-active mass enclosed in a 5 cm lead shielding, was placed at 12 meters from the center of the reactor core. The detector is operated on continuous readout mode with a sub-electron readout noise of 0.17 e. We discuss the challenges involved in the commissioning of the detector and present preliminary data acquired during reactor-ON and reactor-OFF periods.
[1] O. Abramoff, L. Barak, I. M. Bloch, L. Chaplinsky, M. Crisler, Dawa, A. Drlica-Wagner, R. Essig, J. Estrada, E. Etzion, and et al., “Sensei: Direct-detection constraints on sub-GeV dark matter from a shallow underground run using a prototype skipper CCD,” Physical Review Letters 122 (2019). [2] CONNIE Collaboration • Alexis Aguilar-Arevalo (Mexico U.) et al. Search for light mediators in the low-energy data of the CONNIE reactor neutrino experiment. JHEP 04 (2020), 054. [3] G.. Fernandez-Moroni, P. A. N. Machado, I. Martinez-Soler, Y. F. Perez-Gonzalez, D. Rodrigues, and S. RosauroAlcaraz. The physics potential of a reactor neutrino experiment with Skipper CCDs: Measuring the weak mixing angle. JHEP, 03:186, (2021). [4] G. Fernandez-Moroni, R. Harnik, P. A. N. Machado, I. Martinez-Soler, Y. F. Perez-Gonzalez, D. Rodrigues, and S. Rosauro-Alcaraz. The physics potential of a reactor neutrino experiment with Skipper-CCDs: Searching for new physics with light mediators. J. High Energ. Phys. 2022, 127 (2022). [5] G. Fernandez Moroni, F. Chierchie, J. Tiffenberg, A. Botti, M. Cababie, G. Cancelo, E. L. Depaoli, J. Estrada, S. E. Holland, D. Rodrigues, I. Sidelnik, M. Sofo Haro, L. Stefanazzi, and S. Uemura. The skipper ccd for low-energy threshold particle experiments above ground, (2022). in press. [6] P. Adari et. al. Excess workshop: Descriptions of rising low-energy spectra, 2022. arXiv:2202.0509
Deployment and performance of a Low-Energy-Threshold Skipper-CCD inside a nuclear reactor
Get PDFCharge Coupled Devices (CCD) are used for reactor neutrino experiments and
already shown their potential in constraining new physics models. The prospect
of a Skipper-CCD experiment looking for standard and beyond standard model
physics (BSM) in a nuclear reactor has been recently evaluated for different
benchmark scenarios. Here we report the installation of the first 2 g
Skipper-CCD inside the containment building of a 2 GW nuclear power
plant, positioned 12 meters from the center of the reactor core. We discuss the
challenges involved in the commissioning of the detector and present data
acquired during reactor ON and reactor OFF periods, with the detector operating
with a sub-electron readout noise of 0.17 e-. The ongoing efforts to improve
sensitivities to CEvNS and BSM interaction are also discussed.Comment: 12 pages, 7 figures, 1 tabl
Deployment and performance of a Low-Energy-Threshold Skipper-CCD inside a nuclear reactor
No full textAbstract Charge Coupled Devices (CCD) are being used for reactor neutrino experiments and have already demonstrated their potential in constraining new physics models. The prospect of a Skipper-CCD experiment looking for standard and beyond standard model (BSM) physics in a nuclear reactor has been evaluated for different benchmark scenarios. Here, we report the first installation of a 2-g Skipper-CCD inside the containment building of a 2 GW th nuclear power plant and analyze its performance throughout its first 18 months of operation. The sensor was successfully deployed at Atucha II, in Argentina, 12 meters away from the center of the reactor core. We discuss the challenges involved in the commissioning of the detector and present data acquired during reactor ON and reactor OFF periods, with the sensor functioning with a sub-electron readout noise of 0.17 e−. Based on an exposure of 56.8 g day reactor ON and two reactor OFF data sets with a total exposure of 118.1 g day we characterize the system and evaluate the sensitivity to CEvNS. We achieved a background rate of 33 kdru and a low threshold of 45 eV ee . The ongoing efforts to improve sensitivities to CEvNS and BSM interaction are also discussed
First results from a multiplexed and massive instrument with sub-electron noise Skipper-CCDs
Get PDFWe present a new instrument composed of a large number of sub-electron noise
Skipper-CCDs operated with a two stage analog multiplexed readout scheme
suitable for scaling to thousands of channels. New, thick, Mpix sensors,
from a new foundry, are glued into a Multi-Chip Module (MCM) printed circuit
board on a ceramic substrate which has 16 sensors each. The instrument, that
can hold up-to 16 MCMs, a total of 256 Skipper-CCD sensors (called a
Super-Module with grams of active mass and Mpix), is part
of the RD effort of the OSCURA experiment which will have
super-modules. Experimental results with MCMs and Skipper-CCDs
sensors are presented in this paper. This is already the largest ever build
instrument with single electron sensitivity CCDs using nondestructive readout,
both, in terms of active mass and number of channels.Comment: Corrected minor typo
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Sub-electron noise multi-amplifier sensing CCDs for spectroscopy
No full textDetectors with sub-electron noise open new possibilities for the spectroscopy of Earth-like exoplanets, probing the faintest signatures of dark energy and dark matter with high-redshift galaxies, and observing fast-evolving transients. Multi-amplifier sensing (MAS) charge-coupled devices (CCDs) offer the capability to achieve ultra-low readout noise floors together with a readout rate comparable to current CCDs employed in observatories. This is achieved by distributing a chain of Skipper floating-gate amplifiers along the serial register, allowing charge to be read repeatedly, non-destructively, and independently. We show recent progress in optimizing the MAS CCD for use in astronomy. These include reducing noise to sub-electron levels with faster read times than Skipper CCDs, optical characterization results, and a discussion of the range of astronomical science cases and facilities that would be enabled by MAS CCDs
