J. Metcalfe
A5086771757- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- CCD and CMOS Imaging Sensors
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Radiation Effects in Electronics
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Advanced Semiconductor Detectors and Materials
- Silicon and Solar Cell Technologies
- advanced mathematical theories
- Gamma-ray bursts and supernovae
- Advanced Data Storage Technologies
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
Argonne National Laboratory
2016-2025
Northern Illinois University
2016-2024
A. Alikhanyan National Laboratory
2024
SR Research (Canada)
2024
Federación Española de Enfermedades Raras
2024
Atlas Scientific (United States)
2024
The University of Adelaide
2014-2023
Goddard Space Flight Center
2022-2023
Nagoya University
2023
University of America
2023
The All-sky Medium Energy Gamma-ray Observatory (AMEGO) is a probe class mission concept that will provide essential contributions to multimessenger astrophysics in the late 2020s and beyond. AMEGO combines high sensitivity 200 keV 10 GeV energy range with wide field of view, good spectral resolution, polarization sensitivity. Therefore, key study astrophysical objects have unique signatures gamma-ray regime, such as neutron star mergers, supernovae, flaring active galactic nuclei....
The All-sky Medium Energy Gamma-ray Observatory eXplorer (AMEGO-X) is designed to identify and characterize gamma rays from extreme explosions accelerators. main science themes include: supermassive black holes their connections neutrinos cosmic rays; binary neutron star mergers the relativistic jets they produce; ray particle acceleration sources including Galactic supernovae; continuous monitoring of other astrophysical events over full sky in this important energy range. AMEGO-X will...
We present VMM1, the first prototype of a family front-end ASICs designed for ATLAS muon upgrade. The ASIC will operate with MICROMEGAS and TGC detectors, providing charge timing measurements along other features including sub-hysteresis discrimination, address event in real time, digital output per channel Time-over-Threshold measurements. shaper, via concept Delayed Dissipative Feedback (DDF), supports analog dynamic ranges excess 10 \thinspace000. With capacitance 200 pF nominal peaking...
A bstract The Compact Linear Collider (CLIC) is a proposed future high-luminosity linear electron-positron collider operating at three energy stages, with nominal centre-of-mass energies $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 380 GeV, 1 . 5 TeV, and 3 TeV. Its aim to explore the frontier, providing sensitivity physics beyond Standard Model (BSM) precision measurements of processes an emphasis on Higgs...
With the discovery of Higgs boson, spectrum particles in Standard Model (SM) is complete. It more important than ever to perform precision measurements and test for deviations from SM predictions electroweak sector. In this report, we investigate two themes arena measurements: observables (EWPOs) that particle content couplings minimal supersymmetric SM, involving multiple gauge bosons final state which provide unique probes basic tenets symmetry breaking. Among EWPOs focus our discussion on...
A next-generation medium-energy gamma-ray telescope targeting the MeV range would address open questions in astrophysics regarding how extreme conditions accelerate cosmic-ray particles, produce relativistic jet outflows, and more. One concept, AMEGO-X, relies upon mission-enabling CMOS Monolithic Active Pixel Sensor silicon chip AstroPix. AstroPix is designed for space-based use, featuring low noise, power consumption, high scalability. Desired performance of device include an energy...
Abstract For the proposed space based gamma-ray observatory All-sky Medium-Energy Gamma-ray Observatory eXplorer (AMEGO-X), a silicon tracker on novel High Voltage-CMOS (HV-CMOS) sensor called AstroPix, is currently being developed. Preliminary measurements with first full reticle prototype AstroPix3 show that power target of 1.5 mW/cm 2 can not be reached due to digital consumption 3.08 , while analog 1.04 and break down voltage over 350 V look promising. Based these results, design changes...
Multiboson production provides a unique way to probe Electroweak Symmetry Breaking (EWSB) and physics beyond the Standard Model (SM). With discovery of Higgs boson, default model is that EWSB occurs according mechanism. Deviations from SM in gauge boson properties due new at higher energy scale can be parameterized by higher-dimension operators an Effective Field Theory (EFT). We present sensitivity studies for dimension-6 dimension-8 EFT looking anomalous vector scattering triboson...
Gamma-rays, the most energetic photons, carry information from far reaches of extragalactic space with minimal interaction or loss information. They bring messages about particle acceleration in environments so extreme they cannot be reproduced on earth for a closer look. Gamma-ray astrophysics is complementary collider work that physicists and astroparticle are often one same. instruments, especially Fermi Space Telescope, have been pivotal major multi-messenger discoveries over past...
Space-based gamma-ray telescopes such as the Fermi Large Area Telescope have used single sided silicon strip detectors to track secondary charged particles produced by primary gamma-rays with high resolution. At lower energies targeted keV-MeV telescopes, two dimensional position information within a detector is required for event reconstruction - especially in Compton regime. This work describes development of monolithic CMOS active pixel sensors AstroPix novel technology use future...
For the potential use in future high luminosity applications energy physics (HEP) [e.g., Large Hadron Collider (LHC) upgrade], we evaluated radiation tolerance of a candidate technology for front-end readout application-specific integrated circuit (ASIC) silicon strip detectors. The devices investigated were first-generation silicon-germanium (SiGe) heterojunction bipolar transistors (HBTs). current gain as function collector has been measured at several stages: before and after irradiation...
We present VMM1, the first prototype of a family front-end ASICs designed for ATLAS muon upgrade. The ASIC will operate with MICRO MEG AS and TGC detectors providing charge timing measurements along number features including sub-hysteresis discrimination, address event in real time, digital output per channel Time-over-Threshold measurements. shaper, using concept Delayed Dissipative Feedback (DDF), allows analog dynamic ranges excess 10,000. With capacitance 200 pF nominal peaking time 25...
(1938). LVI. Pre-striking currents in a thyratron. The London, Edinburgh, and Dublin Philosophical Magazine Journal of Science: Vol. 25, No. 169, pp. 649-663.
Space-based gamma-ray telescopes such as the Fermi Large Area Telescope have used single sided silicon strip detectors to measure position of charged particles produced by incident gamma rays with high resolution. At energies in Compton regime and below, two dimensional information within a detector is required. Double are one option; however, this technology difficult fabricate large arrays susceptible noise. This work outlines development implementation monolithic CMOS active pixel...