Registration Room: 122:026

Message from the KTH Director

• Peter Gudmundson

Room: 122:026

KTH Partnerships

• Björn Birgisson (KTH)

Room: 122:026

Opportunities for Mesoscale Science: A MaRIE Perspective

• John Sarrao (Los Alamos)

Room: 122:026 Mesoscale science embraces the regime where atomic granularity and quantization of energy yield to continuous matter and energy, collective behavior reaches its full potential, defects, fluctuations and statistical variation emerge, interacting degrees of freedom create new phenomena, and homogeneous behavior gives way to heterogeneous structure and dynamics.1 Mesoscale science builds on the foundation of nanoscale knowledge and tools that the community has developed over the last decade and continues to develop. Mesoscale phenomena offer a new scientific opportunity: designing architectures and interactions among nanoscale units to create new macroscopic behavior and functionality. MaRIE, for Matter-Radiation Interactions in Extremes, is Los Alamos National Laboratory’s facility concept for addressing decadal challenges in materials, especially in extreme environments, through a focus on predicting and controlling materials microstructure at the mesoscale. MaRIE will be an international user facility and will enable unprecedented in-situ, transient measurements of “real” mesoscale materials in relevant extremes, especially dynamic loading and irradiation extremes. Concurrent advances in multi-scale modeling and computational resources hold great promise for rapid progress toward these goals. In this presentation we will discuss both the science questions that motivate the mesoscale opportunity and how a particular facility, MaRIE, can address a subset of these challenges. Importantly, theoretical and computational advances that enable effective data utilization are of comparable significance and challenge as the acquisition of said data. Our recent experience in attempting to pursue this vision of prediction and control at the mesoscale will form a central element of the presentation.

KTH Materials Platform

• Ulf Karlsson (KTH)

Room: 122:026

Experimental Capabilities of Highe Magnetic Fields at NHMFL Los Alamos

• Charles Mielke (LANL)

Room: 122:026 Magnetic fields have become an indispensable tool for science to better understand and manipulate ground states of electronic materials. As magnetic field intensities are increased the quantum nature of these materials become exponentially more likely to be observed and this is but one of the drivers to go further in high magnetic field generation. At the Los Alamos branch of the National High Magnetic Field Laboratory we have significant efforts in extremely high magnetic field generation and experimentation. In direct opposition with our efforts are the tremendous electro-mechanical forces exerted on our magnets. Challenges in magnetic field generation and research will be presented. Various method of pulsed high magnetic field generation and experimentation capabilities will be reviewed, including our recent "World Record" for the highest non-destructive magnetic field.

Materials Modeling at KTH

• Levente Vitos (KTH)

Room: 122:026

Materials Modeling

• Avadh Saxena (LANL)

Room: 122:026

Frontiers in AFM Imaging

• David Haviland (KTH)

Room: 122:026

Nanoscale SC

• Mikael Fogelström (Chalmers)

Room: 122:026

Round Table Discussion Room: 122:026

Nuclear Reactor Safety

• Sevostian Bechta (KTH)

Room: 122:026

Next Generation Nuclear Materials Management

• Michael Miller (LANL)

Room: 122:026 Nuclear energy continues to play a significant role in response to the increasing global demand for electricity, without adding to the accumulation of greenhouse gases. It is however, not without risks that must be properly managed. A key factor in the assurance of peaceful use in the deployment of nuclear power is robust nuclear materials management. The U.S. Department of Energy – Office of Nuclear Energy and the National Nuclear Security Agency are actively engaged in a broad-based program of research to detect, control, account for, and secure nuclear materials and to provide analysis and assessment tools. A review of these programs will be given, with particular emphasis on areas where advanced materials can play a role as well as the development of analyses and tools to support proliferation and terrorism risk assessment and used fuel management.

Material Development and Testing for High Dose Reactor Applications

• Stuart Maloy (LANL)

Room: 122:026 The Fuel Cycle Research and Development program is investigating methods of dealing with transuranics in various fuel cycle options and is supporting the development of next generation Light Water Reactor (LWR) fuels. To achieve this goal, new fuels and cladding materials must be developed and tested to high burnup levels (e.g. >20%) and under accident conditions. To achieve such high burnup levels the fast reactor core materials (cladding and duct) must be able to withstand very high doses (greater than 200 dpa) while in contact with the coolant and the fuel. Thus, these materials must withstand radiation effects that promote low temperature embrittlement, radiation induced segregation, high temperature helium embrittlement, swelling, irradiation creep, corrosion with the coolant, and chemical interaction with the fuel (FCCI). <br><br> To develop and qualify materials to a total fluence greater than 200 dpa requires development of advanced alloys and irradiations in fast reactors to test these alloys. Test specimens of ferritic/martensitic alloys (T91/HT-9) previously irradiated in the FFTF reactor up to 210 dpa at a temperature range of 350-700°C are presently being tested. This includes analysis of a duct made of HT-9 after irradiation to a total dose of 155 dpa at temperatures from 370 to 510°C. Advanced radiation tolerant materials are also being developed to enable the desired extreme fuel burnup levels. Specifically, coatings and liners are being developed to minimize FCCI, and research is underway to fabricate large heats of radiation tolerant oxide dispersion steels with homogeneous oxide dispersions. Recent progress in high dose irradiated materials testing and advanced radiation resistant materials development will be presented.

TBA

• Nils Sandberg (SSM)

Room: 122:026

Sweden and the Nuclear Security Summit Process

• J. Lodding (Nonprolif. Dept., Swedish Ministry for Foreign Affairs)

Room: 122:026

Overview of the Center for Nonlinear Studies at Los Alamos

• Aric Hagberg (LANL)

Room: 122:026 The Center for Nonlinear Studies (CNLS) at Los Alamos National Laboratory supports and promotes research in interdisciplinary science. I will give an overview of how the CNLS integrates postdocs, students, visitors, and conferences to create a vibrant research center. I will highlight some of the latest results from the postdoctoral program and give a perspective on collaboration opportunities.

International Programs in Nuclear Physics at KTH

• Ramon Wyss (KTH)

Room: 122:026

Modeling of Cu Corrosion

• Anders Rosengren (KTH)
• Anatoly Belonoshko (KTH)

Room: 122:026

Public Outreach and Sustainable Nuclear Energy

• Galina Balatsky (LANL)

Room: 122:026 This presentation is about the importance of public outreach for a sustainable nuclear energy program. The Fukushima-Daichii incident of 2011 and its aftermath changed the course of the “Nuclear Renaissance” and brought back skepticism about nuclear energy and its future. Some countries decided to discontinue or slow down their nuclear energy generating plans while others remain committed to nuclear energy. The talk underscores the linkage of media reporting and public opinion on policy changes.

Round Table Discussion Room: 122:026

ARPES on Topological Insulators

• Oscar Tjernberg (KTH)

Room: 122:026

Spin Fluctuations and the Peak-Dip-Hump Structure in the Photoelectron Spectrum of Actinide Metals

• Matthias Graf (LANL)

Room: 122:026 We present first-principles based multiband spin-fluctuation calculations within the random-phase approximation for four isostructural intermetallic actinides, namely the superconductors PuCoIn5, PuCoGa5, PuRhGa5, and the paramagnet UCoGa5. The results show that a strong peak in the spin-fluctuation dressed self-energy is present around 0.5 eV in all materials, which is mostly created by 5f electrons. These fluctuations are coupled to electrons, which gives rise to the peak-dip-hump structure in the spectral function, characteristic of the coexistence of itinerant and localized electronic states. Our results are in quantitative agreement with available photoelectron spectra on PuCoGa5 [1] and UCoGa5 [2]. Our self-consistent intermediate Coulomb coupling GW calculations of the self-energy are performed within the fluctuation exchange approximation [3,4] using first-principles electronic structure input obtained from the density functional theory within the generalized gradient approximation (GGA). We find that the effective coupling of electrons to spin fluctuations creates a dip in the single-particle excitations due to strong scattering between spin-orbit split states. The lost spectral weight (dip) in the spectral function is distributed partially to the renormalized itinerant states at the Fermi level (peak), as well as to the strongly localized incoherent states at higher energy (hump). The coherent states at the Fermi level can still be characterized as Bloch waves, though strongly renormalized, whereas the incoherent electrons are localized in real space exhibiting the dispersionless hump structure. We will discuss the impact of our first-principles based intermediate coupling model for calculating electronic hot spots in the spectral function and the multiband spin-fluctuation spectrum relevant for electric and thermal transport in both actinide metals and nuclear fuel materials. This work was supported by the U.S. DOE under Contract No. DE-AC52-06NA25396 through the Office of Basic Energy Sciences (BES) and the LDRD Program at LANL. We acknowledge a NERSC computing allocation of the U.S. DOE under Contract No. DE-AC02-05CH11231. <br><br> [1] T. Das, J.-X. Zhu, and M.J. Graf (2012), Phys. Rev. Lett. 108, 137001. <br>[2] T. Das, T. Durakiewicz, J.-X. Zhu, J.J. Joyce, J. L. Sarrao, and M.J. Graf (2012), Phys. Rev. X 2, 041012. <br>[3] R.S. Markiewicz, T. Das, S. Basak, and A. Bansil (2010), J. Electron. Spectrosc. Relat. Phenom. 181, 23. <br>[4] T. Das, J.-X. Zhu, and M.J. Graf (2013), J. Materials Research 28, 659.

Spintronics at KTH, Spin Laser

• Vladislav Korenivski (Stockholm University)

Room: 122:026

Superconducting Laser

• Vladimir Krasnov (Stockholm University)

Room: 122:026

Lunch and Round Table Discussion at the AlbaNova Cafeteria Room: 122:026