19 Apr

High-Field Superconductors and Superconducting Magnets for Electron Cyclotron Resonance Ion Source and Frontier Nuclear Physics

19 April 2024 - 3:00 PM
1221A and 1221B FRIB Laboratory
Lawrence Berkeley National Laboratory

Tengming Shen

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FRIB and LBNL have been collaborating to build high-field superconducting ECR ion source (ECRIS). Out of this collaboration, the first 28 GHz all superconducting Nb-Ti based ECRIS magnet has been in operation at FRIB since 2022 and the designing and prototyping efforts in using a higher-field Nb3Sn conductor are ongoing. This talk will discuss performance, design, design and simulation tools, fabrication methods used for these magnets, and their limits. This talk will also discuss characteristics of practical high field superconductors (Nb-Ti, Nb3Sn, and high-temperature superconductors), a new MARS-ECRIS magnet concept being prototyped at LBNL, the possibility of utilizing high-temperature superconductors for building ECRIS and frontier nuclear physics.

23 Apr

Tentative Thesis Title:
Precision Mass Measurement of Proton Halo Candidate 22Al and the Development of the Single Ion Penning Trap

23 April 2024 - 2:00 PM
1200 FRIB Laboratory
FRIB Graduate Research Assistant

Scott Campbell

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Committee: Ryan Ringle (Chairperson), Kei Minamisono, Scott Pratt, Reinhard Schwienhorst, Hui-Chia Yu.
26 Apr

Probing Dense Matter in Neutron Stars

26 April 2024 - 10:00 AM
2025 FRIB Laboratory and Online via Zoom
Goethe University Frankfurt

Juergen Schaffner-Bielich

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*Please note that this seminar will take place at 10am Eastern Time Neutron Stars are born in core-collapse supernovae being the endpoint of stellar evolution of massive stars. Their extreme properties allow for the study of dense matter in the sky. In recent years the advancement of astrophysical observations has been so tremendous that the properties of neutron stars can be constrained nowadays to an unprecedented level. I will summarize the basic observations of neutron star masses from pulsar data, the constraints on radii from x-ray measurements, and the first detection of gravitational waves from a neutron star merger. On the other hand, I will discuss the nuclear and particle physics aspects of the equation of state of neutron star matter which is firmly limited at low and high energy densities. Chiral effective field theory puts a stringent constraint up to about saturation density for pure neutron matter. Perturbative QCD calculations narrow the equation of state at ultimately high densities. Finally, I will address the possible existence of new phases in the core of neutron stars which can be revealed from the mass-radius relation of neutron stars. I will argue that it is in principle impossible to rule out phase transitions in neutron stars from observations based on general relativity alone. Speaker Homepage: https://astro.uni-frankfurt.de/schaffner/
30 Apr

Quantum Algorithms for Simulating Nuclear Effective Field Theories

30 April 2024 - 11:00 AM
1200 FRIB Laboratory and Online via Zoom
University of Maryland

James Watson

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Quantum computers offer the potential to simulate nuclear processes that are classically intractable. With the goal of understanding the necessary quantum resources, we employ state-of-the-art Hamiltonian-simulation methods, and conduct a thorough algorithmic analysis, to estimate the qubit and gate costs to simulate low-energy effective field theories (EFTs) of nuclear physics. In particular, within the framework of nuclear lattice EFT, we obtain simulation costs for the leading-order pionless and pionful EFTs. We consider both static pions represented by a one-pion-exchange potential between the nucleons, and dynamical pions represented by relativistic bosonic fields coupled to non-relativistic nucleons. We examine the resource costs for the tasks of time evolution and energy estimation for physically relevant scales. We account for model errors associated with truncating either long-range interactions in the one-pion-exchange EFT or the pionic Hilbert space in the dynamical-pion EFT, and for algorithmic errors associated with product-formula approximations and quantum phase estimation. Our results show that the pionless EFT is the least costly to simulate and the dynamical-pion theory is the costliest. We demonstrate how symmetries of the low-energy nuclear Hamiltonians can be utilized to obtain tighter error bounds on the simulation algorithm. By retaining the locality of nucleonic interactions when mapped to qubits, we achieve reduced circuit depth and substantial parallelization. This work highlights the importance of combining physics insights and algorithmic advancement in reducing quantum-simulation costs.
09 May


09 May 2024 - 8:00 AM
1221A and 1221B FRIB Laboratory
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The STREAMLINE (SmarT Reduction and Emulation Applying Machine Learning In Nuclear Environments) collaboration aims to advance the frontiers of theoretical and computational research on the nuclear many-body problem using ML. The scientific problems we address are among the most challenging in computational nuclear many-body theory and the collaboration is aligned with the U.S. government initiative to build a broad-based, multidisciplinary, multi-agency program for a sustained national AI structure. STREAMLINE will advance large nuclear physics computations to dramatically increase predictive power and improve our understanding of nuclear structure and dynamics, dense nucleonic matter, and emergent many-body phenomena -- this includes the properties of heavy neutron-rich nuclei and related astrophysical environments at the Facility for Rare Isotope Beams (FRIB); structure and reactions of nuclei and nuclear astrophysics at the Argonne Tandem Linac Accelerator System (ATLAS); neutron distributions in nuclei and few-body systems at Thomas Jefferson National Accelerator Facility (TJNAF); properties of fission at Los Alamos Neutron Science Center (LANSCE); and nuclear structure, reactions, and astrophysics at Association for Research at University Nuclear Accelerator facilities (ARUNA).
12 May

Nuclear Science Summer School

12 May 2024 - 5:00 PM
1221A and 1221B FRIB Laboratory
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The Nuclear Science Summer School (NS3) is a summer school that introduces undergraduate student participants to the fields of nuclear science and nuclear astrophysics. NS3 is hosted by FRIB on the campus of Michigan State University (MSU). The school will offer lectures and activities covering selected nuclear science and astrophysics topics.