Claudio Chavez
A5058676035- CCD and CMOS Imaging Sensors
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Infrared Target Detection Methodologies
- Astrophysics and Cosmic Phenomena
- Photocathodes and Microchannel Plates
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Advanced Optical Sensing Technologies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Atomic and Subatomic Physics Research
- Adaptive optics and wavefront sensing
- Advanced X-ray and CT Imaging
- Nuclear Physics and Applications
- Advanced Sensor Technologies Research
- Advanced Semiconductor Detectors and Materials
- Spectroscopy and Laser Applications
- Particle Accelerators and Free-Electron Lasers
- Pulsars and Gravitational Waves Research
- Advanced Measurement and Detection Methods
- Medical Imaging Techniques and Applications
- Semiconductor Lasers and Optical Devices
- Sensor Technology and Measurement Systems
Universidad Nacional del Sur
2022-2025
Universidad Nacional de Asunción
2016-2025
Fermi National Accelerator Laboratory
2021-2025
Consejo Nacional de Investigaciones Científicas y Técnicas
2022-2024
We present results of a dark matter search performed with 0.6 kg d exposure the DAMIC experiment at SNOLAB underground laboratory. measure energy spectrum ionization events in bulk silicon charge-coupled devices down to signal 60 eV electron equivalent. The data are consistent radiogenic backgrounds, and constraints on spin-independent WIMP-nucleon elastic-scattering cross section accordingly placed. A region parameter space relevant potential from CDMS-II Si is excluded using same target...
The Coherent Neutrino-Nucleus Interaction Experiment (CONNIE) uses low-noise fully depleted charge-coupled devices (CCDs) with the goal of measuring low-energy recoils from coherent elastic scattering ($\mathrm{CE}\ensuremath{\nu}\mathrm{NS}$) reactor antineutrinos silicon nuclei and testing nonstandard neutrino interactions (NSI). We report here first results detector array deployed in 2016, considering an active mass 47.6 g (eight CCDs), which is operating at a distance 30 m core Angra 2...
We present direct detection constraints on the absorption of hidden-photon dark matter with particle masses in range $1.2--30\text{ }\mathrm{eV}\text{ }{c}^{\ensuremath{-}2}$ DAMIC experiment at SNOLAB. Under assumption that local is entirely constituted hidden photons, sensitivity to kinetic mixing parameter $\ensuremath{\kappa}$ competitive from solar emission, reaching a minimum value $2.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}$ $17\text{ }\text{ }{c}^{\ensuremath{-}2}$....
A bstract The Coherent Neutrino-Nucleus Interaction Experiment (CONNIE) is taking data at the Angra 2 nuclear reactor with aim of detecting coherent elastic scattering antineutrinos silicon nuclei using charge-coupled devices (CCDs). In 2019 experiment operated a hardware binning applied to readout stage, leading lower levels noise and improving detection threshold down 50 eV. results analysis are reported here, corresponding detector array 8 CCDs fiducial mass 36.2 g total exposure 2.2...
A novel readout architecture that uses multiple nondestructive floating-gate amplifiers (FGAs) to achieve subelectron noise in a thick, fully depleted silicon detector is presented. This multiple-amplifier sensing charge-coupled device (MAS-CCD) can perform independent charge measurements with each amplifier; then be combined further reduce the noise. allows getting operation less time compared single-nondestructive-amplifier CCDs. The performance of this demonstrated, emphasizing ability...
The CONNIE detector prototype is operating at a distance of 30 m from the core 3.8 GW$_{\rm th}$ nuclear reactor with goal establishing Charge-Coupled Devices (CCD) as new technology for detection coherent elastic neutrino-nucleus scattering. We report on results engineering run an active mass 4 g silicon. CCD array described, and performance observed during first year discussed. A compact passive shield was deployed detector, producing order magnitude reduction in background rate. remaining...
The CONNIE experiment uses fully depleted, high resistivity CCDs as particle detectors in an attempt to measure for the first time Coherent Neutrino-Nucleus Elastic Scattering of antineutrinos from a nuclear reactor with silicon nuclei. This talk, given at XV Mexican Workshop on Particles and Fields (MWPF), discussed potential perform this measurement, installation progress Angra dos Reis power plant, well plans future upgrades.
The CONNIE experiment is located at a distance of 30 m from the core commercial nuclear reactor, and has collected 3.7 kg-day exposure using CCD detector array sensitive to an ∼1 keV threshold for study coherent neutrino-nucleus elastic scattering. Here we demonstrate potential this low-energy neutrino as probe physics Beyond Standard Model, by recently published results constrain two simplified extensions Model with light mediators. We compare new limits those obtained same models neutrinos...
Abstract We present results from the characterization and optimization of Skipper charge-coupled devices (CCDs) for use in a focal plane prototype Southern Astrophysical Research Integral Field Spectrograph (SIFS). tested eight CCDs selected six SIFS based on performance results. The are 6k × 1k, 15 μ m pixels, thick, fully depleted, p -channel that have been thinned to ∼250 m, backside processed, treated with an anti-reflective coating. demonstrate single-sample readout noise <4.3 e −...
The development of the Skipper-charge-coupled devices (Skipper-CCDs) has been a major technological breakthrough for sensing very weak ionizing particles. sensor allows to reach ultimate sensitivity silicon material as charge signal by unambiguous determination collected each cell or pixel, even single electron–hole pair ionization. Extensive use technology was limited lack specific equipment operate at performance. A simple, single-board Skipper-CCD controller designed authors is presented...
A bstract Oscura is a planned light-dark matter search experiment using Skipper-CCDs with total active mass of 10 kg. As part the detector development, collaboration plans to build Integration Test (OIT), an engineering test 10% mass. Here we discuss early science opportunities OIT for millicharged particles (mCPs) NuMI beam at Fermilab. mCPs would be produced low energies through photon-mediated processes from decays scalar, pseudoscalar, and vector mesons, or direct Drell-Yan productions....
Millicharged particles, proposed by various extensions of the standard model, can be created in pairs high-energy photons within nuclear reactors and interact electromagnetically with electrons matter. Recently, existence a plasmon peak interaction cross section silicon eV range was highlighted as promising approach to enhance low-energy sensitivities. The CONNIE Atucha-II reactor neutrino experiments utilize Skipper-CCD sensors, which enable detection interactions range. We present...
Abstract Oscura is a proposed multi-kg skipper-CCD experiment designed for dark matter (DM) direct detection search that will reach unprecedented sensitivity to sub-GeV DM-electron interactions with its 10 kg detector array. planning operate at SNOLAB 2070 m overburden, and aims background goal of less than one event in each electron bin the 2–10 ionization-signal region full 30 kg-year exposure, radiation rate 0.01 dru.[1 dru (differential unit) corresponds 1 event/kg/day/keV.] In order...
The Oscura experiment will lead the search for low-mass dark matter particles using a very large array of novel silicon Charge Coupled Devices (CCDs) with threshold two electrons and total exposure 30 kg-yr. R&D effort, which began in FY20, is currently entering design phase goal being ready to start construction late 2024. have unprecedented sensitivity sub-GeV that interact electrons, probing matter-electron scattering masses down 500 keV absorbed by 1 eV. effort has made some significant...
The Skipper-in-CMOS image sensor integrates the non-destructive readout capability of Skipper Charge Coupled Devices (Skipper-CCDs) with high conversion gain a pinned photodiode in CMOS imaging process, while taking advantage in-pixel signal processing. This allows both single photon counting as well frame rate through highly parallel first results obtained from 15 x um^2 pixel cell fabricated Tower Semiconductor's commercial 180 nm Image Sensor process are presented. Measurements confirm...
Detectors with sub-electron noise open new possibilities for the spectroscopy of Earth-like exoplanets, probing faintest signatures dark energy and matter high-redshift galaxies, observing fast-evolving transients. Multi-amplifier sensing (MAS) charge-coupled devices (CCDs) offer capability to achieve ultra-low readout floors together a rate comparable current CCDs employed in observatories. This is achieved by distributing chain Skipper floating-gate amplifiers along serial register,...
The non-destructive readout capability of the Skipper Charge Coupled Device (CCD) has been demonstrated to reduce noise limitation conventional silicon devices levels that allow single-photon or single-electron counting. reduction is achieved by taking multiple measurements charge in each pixel. These come at cost extra time, which a for broader adoption this technology particle physics, quantum imaging, and astronomy applications. This work presents recent results novel sensor architecture...
We present a new instrument composed of large number sub-electron noise Skipper-CCDs operated with two stage analog multiplexed readout scheme suitable for scaling to thousands channels. New, thick, $1.35$ Mpix sensors, from foundry, are glued into Multi-Chip Module (MCM) printed circuit board on ceramic substrate which has 16 sensors each. The instrument, that can hold up-to MCMs, total 256 Skipper-CCD (called Super-Module $\approx 130$ grams active mass and $346$ Mpix), is part the R$\&$D...
Oscura is a proposed multi-kg skipper-CCD experiment designed for dark matter (DM) direct detection search that will reach unprecedented sensitivity to sub-GeV DM-electron interactions with its 10 kg detector array. planning operate at SNOLAB 2070 m overburden, and aims background goal of less than one event in each electron bin the 2-10 ionization-signal region full 30 kg-year exposure, radiation rate 0.01 dru. In order achieve this goal, must address potential source events, including...
The development of the Skipper Charge Coupled Devices (Skipper-CCDs) has been a major technological breakthrough for sensing very weak ionizing particles. sensor allows to reach ultimate sensitivity silicon material as charge signal by unambiguous determination collected each cell or pixel, even single electron-hole pair ionization. Extensive use technology was limited lack specific equipment operate at performance. In this work simple, single-board Skipper-CCD controller is presented, aimed...
With Skipper-CCD detectors it is possible to take multiple samples of the charge packet collected on each pixel. After averaging samples, noise can be extremely reduced allowing exact counting electrons per In this work we present an analog circuit that, with a minimum number components, applies double slope integration (DSI), and at same time, averages producing its output pixel value sub-electron noise. For prupose, introduce technique using DSI integrator capacitor add skipper samples. An...
Many applications for light tight CCDs A skipper-CCD shield X-ray detection in space 3. Testing setup 4. Monochromator results 1.Why do we need CCDs? 2. Aluminum Direct silicon: • Space (i.e.
We present the first on-sky results from an ultra-low-readout-noise Skipper CCD focal plane prototype for SOAR Integral Field Spectrograph (SIFS). The consists of four 6k×1k, 15μm pixel, fully-depleted, p-channel devices that have been thinned to ∼250μm, backside processed, and treated with anti-reflective coating. These CCDs were configured astronomical spectroscopy, i.e., a single-sample readout noise <4.3 e<sup>−</sup> rms/pixel, ability achieve multi-sample ≪ 1 full-well capacities...