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Gabriela Petculescu
Louisiana Accelerator Center
University of Louisiana at Lafayette
Elastic Anisotropy in Additively Manufactured 316L Stainless Steel
The large parameter space in selective laser melting (SLM)
— an additive manufacturing (a.k.a., 3D printing) technology
— presents a challenge for property predictors. In this
seminar, a study of elastic and corrosion properties of SLM 316L
under constant 100 W laser power and variable laser speed (600 to
1200 mm/s) is presented. Property variations and their relation to
the change in material microstructure are analyzed. Resonant
ultrasound spectroscopy on mm-sized rectangular parallelepipeds was
used for measuring location-dependent elastic moduli. Complementary
pulse-echo measurements provided volume-integrated values for the
longitudinal elastic modulus. Cyclic potentiodynamic polarization
measurements were used to determine the corrosion potential, pitting
potential, repassivation current, and corrosion current density of
the fabricated samples. The microstructure was determined with
Electron Backscatter Diffraction. The range of properties observed,
understood through grain boundary density and misorientation
distribution analysis, reinforces the capabilities of materials
produced through SLM: the tuning of fabrication parameters enables
materials tailoring for optimal performance in specific applications. |
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Ish Gupta
Network for Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS)
University of California — Berkeley
Visiting Scholar, Northwestern University
The Journey of Neutron Star-Black Hole Mergers Through the Cosmos
In recent years, gravitational-wave observations of neutron
star-black hole (NSBH) mergers have pushed these events into the
limelight. The pronounced mass asymmetry in NSBH systems
activates higher-order harmonics in the gravitational-wavesignal,
significantly enhancing estimation of binary parameters, compared
to symmetric mass binary systems. This unique characteristic
positions NSBH mergers as critical sources for inferring
astrophysical properties and cosmological parameters. Moreover,if
the neutron star is tidally disrupted, NSBH mergers can produce
electromagnetic counterparts, making them potential
multi-messenger sources. In this talk, I will review the status
of NSBH observations and outline the role NSBH mergerscan play in
fulfilling the science goals of current detectors and
next-generation facilities.
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Frank Meier
Vossen Group
Duke University
Precision Flavor Physics in the Era of Artificial Intelligence
The Standard Model of particle physics (SM) is a powerful
theoretical framework. However, many fundamental questions like
the explanation for the large matter-antimatter asymmetry
observed in today's universe remain unanswered. Precision
measurements and indirect searches offer a promising path to
uncover new insights and potential signs of physics beyond the
SM. Recent advances in computational techniques now allow us to
exploit the large experimental datasets more effectively,
reaching unprecedented levels of precision. In my talk, I will
discuss how machine learning is reshaping these precision
measurements in flavor physics, with a focus on semileptonic
decays of heavy mesons. These decays play a central role in
determining fundamental parameters of the Standard Model and in
probing possible violations of lepton flavor universality. I will
describe how machine-learning-based reconstruction and
classification methods dramatically improve signal efficiency and
background suppression compared to traditional approaches. Using
examples from my work at the Belle II experiment, I will show how
these techniques have enabled more precise measurements.
Finally, I will discuss how these methods generalize beyond
flavor physics and outline future opportunities for applying
modern AI tools to a wide range of data-intensive problems across
experimental physics.here the particles are significantly
accelerated by the dissipation of the magnetic field associated
to a possible reconnection manifestation.
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Meghna Bhattacharya
Computational Science and AI Directorate
Fermilab
Probing the Unknown in the Era of AI
The past decade marked a big expansion in our knowledge across
physics, from discovering the Higgs boson to observing gravitational
waves and imaging black holes. These breakthroughs required
physicists to transition from small-team paradigms to
massive collaborations involving hundreds or thousands of scientists.
Today's large-scale scientific endeavors rely on complex
experimental devices and extensive infrastructures, sharing common
challenges, most notably, managing and analyzing vast datasets.
Addressing fundamental questions, such as the origin of matter, the
mechanisms behind supernovae, and the grand unification of
fundamental forces, requires a paradigm shift to leverage emerging
technologies for fast and efficient discoveries. Accelerator-based
neutrino experiments, utilizing liquid argon time projection
chambers (LArTPCs), are at the forefront of these efforts. In this
talk, I will present new searches using both existing and future
neutrino datasets, alongside AI and machine learning driven
approaches thatenable real time monitoring of rare and time
transient physics signals. I will also highlight cross frontier
computing research and development efforts spanning reconstruction,
inference as a service, and high performance computing that are
critical to acceleratingdiscovery. Together, these developments open
new directions for precision measurements, rapid multi messenger
response, and groundbreaking science with LArTPC detectors.
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