A5022854524- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Catalytic Processes in Materials Science
- CCD and CMOS Imaging Sensors
- Seismic Performance and Analysis
- Catalysis and Oxidation Reactions
- Concrete Corrosion and Durability
- Particle physics theoretical and experimental studies
- Catalysts for Methane Reforming
- Advanced Combustion Engine Technologies
- Superconducting and THz Device Technology
- Radiation Detection and Scintillator Technologies
- Geotechnical Engineering and Underground Structures
- Structural Behavior of Reinforced Concrete
- Catalysis and Hydrodesulfurization Studies
- Petroleum Processing and Analysis
- Photovoltaic System Optimization Techniques
- Structural Response to Dynamic Loads
- Combustion and flame dynamics
- Solar Thermal and Photovoltaic Systems
- Quantum Information and Cryptography
- Structural Engineering and Vibration Analysis
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Solar Radiation and Photovoltaics
California Institute of Technology
2021-2024
University of Chicago
2016-2023
Fermi National Accelerator Laboratory
2016-2023
Shell (Netherlands)
2010-2023
AIR Worldwide (United States)
2014-2021
National Institute of Solar Energy
2021
Alagappa Chettiar Government College of Engineering and Technology
2020
AIR Worldwide (United Kingdom)
2015
General Motors (India)
2008-2013
Georgia Institute of Technology
2010-2012
We report direct-detection constraints on light dark matter particles interacting with electrons. The results are based a method that exploits the extremely low levels of leakage current DAMIC detector at SNOLAB 2-6$\times$10$^{-22}$ A cm$^{-2}$. evaluate charge distribution pixels collect $<10~\rm{e^-}$ for contributions beyond may be attributed to interactions. Constraints placed so-far unexplored parameter space masses between 0.6 and 100 MeV$c^{-2}$. also present new hidden-photon in...
We report constraints on sub-GeV dark matter particles interacting with electrons from the first underground operation of DAMIC-M detectors. The search is performed an integrated exposure 85.23 g days, and exploits subelectron charge resolution low level current charge-coupled devices (CCDs). Dark-matter-induced ionization signals above detector are searched for in CCD pixels up to 7e^{-}. With this dataset we place limits mass between 0.53 1000 MeV/c^{2}, excluding unexplored regions...
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...
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 $2.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}$ $17\text{ }\text{ }{c}^{\ensuremath{-}2}$....
The European Spallation Source (ESS), presently well on its way to completion, will soon provide the most intense neutron beams for multi-disciplinary science. Fortuitously, it also generate largest pulsed neutrino flux suitable detection of Coherent Elastic Neutrino-Nucleus Scattering (CE$\nu$NS), a process recently measured first time at ORNL's Neutron Source. We describe innovative detector technologies maximally able profit from order-of-magnitude increase in provided by ESS, along with...
We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg-day target exposure DAMIC experiment at SNOLAB underground laboratory. The observed energy spectrum and spatial distribution ionization events with electron-equivalent energies $>$200 eV$_{\rm ee}$ in CCDs are consistent backgrounds natural radioactivity. An excess is above analysis threshold 50 ee}$. While origin this low-energy requires further investigation, our data exclude...
We report direction detection constraints on the presence of hidden photon dark matter with masses between 20-30 ueV using a cryogenic emitter-receiver-amplifier spectroscopy setup designed as first iteration QUALIPHIDE (QUantum LImited PHotons In Dark Experiment). A metallic dish sources conversion photons from kinetic mixing onto horn antenna which is coupled to C-band inductance traveling wave parametric amplifier, providing for near quantum-limited noise performance. demonstrate probing...
SUMMARY Probabilistic seismic analysis of structures involves the construction demand models, often stated as probabilistic models structural response conditioned on a intensity measure. The uncertainty introduced by model is result chosen This paper introduces concept using fractional order measures (IMs) in and uses single frame integral concrete box‐girder bridge class seismically designed multispan continuous steel girder case studies. IMs considered include peak ground spectral...
One of the critical needs a Three Way Catalyst (TWC) model is to be able predict light-off. This crucial for application studies and vehicle architectural because most emissions from TWC occur before light-off (called cold-start emissions). Laboratory experiments give detailed insights reaction mechanism analytical forms rate expressions as they are well-controlled well-behaved compared tests. However, on test, laboratory-estimated kinetic parameters not entirely capable various...
The development of single charge resolving, macroscopic silicon detectors has opened a window into rare processes at the $\mathcal{O}(\mathrm{eV})$ scale. In order to reconstruct energy given event, or model signal obtained for amount absorbed by electrons in detector, an accurate yield is needed. this paper we review existing measurements silicon, focusing particular on region below 1 keV. We highlight calibration gap between 12--50 eV (referred as ``UV-gap'') and employ phenomenological...
Multispan continuous steel girder bridges are one of the most common bridge types in central and southeastern United States. Seismic fragility curves for these highway essential risk assessment transportation networks exposed to seismic hazards. This study focuses on developing comparing seismically nonseismically designed that this region. The primary differences between column details bearings. Detailed three-dimensional (3-D) nonlinear analytical models, which account behavior column,...
We construct the first comprehensive radioactive background model for a dark matter search with charge-coupled devices (CCDs). leverage well-characterized depth and energy resolution of DAMIC at SNOLAB detector detailed geant4-based particle-transport simulation to both bulk surface backgrounds from natural radioactivity down 50 eVee. fit distributions observed ionization events differentiate constrain possible sources, example, 3H silicon cosmogenic activation 210Pb radon plate-out. observe...
Experiments aiming to directly detect dark matter through particle recoils can achieve energy thresholds of $\mathcal{O}(1\,\mathrm{eV})$. In this regime, ionization signals from small-angle Compton scatters environmental $\gamma$-rays constitute a significant background. Monte Carlo simulations used build background models have not been experimentally validated at these low energies. We report precision measurement scattering on silicon atomic shell electrons down 23$\,$eV. A skipper...
A heterogeneous one-dimensional model is used to simulate a three way catalytic converter (TWC). The mathematical consists of mass and energy balance equations in the gas solid phases accounts for 15 chemical reactions. Langmuir−Hinshelwood type kinetics represent most reaction rates. In this work, kinetic parameters various reactions occurring TWC are estimated using vehicle data based on genetic-algorithm-based optimization. method uses test estimate by minimizing deviation between...
An important source of background in direct searches for low-mass dark matter particles are the energy deposits by small-angle scattering environmental $\ensuremath{\gamma}$ rays. We report detailed measurements low-energy spectra from Compton rays bulk silicon a charge-coupled device (CCD). Electron recoils produced $^{57}\mathrm{Co}$ and $^{241}\mathrm{Am}$ radioactive sources measured between 60 eV 4 keV. The observed agree qualitatively with theoretical predictions, characteristic...
The DAMIC-M (DArk Matter In CCDs at Modane) experiment employs thick, fully depleted silicon charged-coupled devices (CCDs) to search for dark matter particles with a target exposure of 1 kg-year. A novel skipper readout implemented in the provides single electron resolution through multiple non-destructive measurements individual pixel charge, pushing detection threshold eV-scale. will advance by several orders magnitude exploration particle hypothesis, particular candidates pertaining...
Microcalorimeters that leverage microwave kinetic inductance detectors to read out phonon signals in the particle-absorbing target, referred as phonon-mediated (KIPM) detectors, offer an attractive detector architecture probe dark matter (DM) down fermionic thermal relic mass limit. A prototype KIPM featuring a single aluminum resonator patterned onto 1-gram silicon substrate was operated NEXUS low-background facility at Fermilab for characterization and evaluation of this architecture's...