MOPLS —  Monday Poster Session-Lake Superior   (02-Sep-19   16:30—18:00)
Paper Title Page
Spectroscopic Correlations to Resistive Switching of Ion Beam Irradiated Films  
SUPLH08   use link to see paper's listing under its alternate paper code  
  • K.N. Rathod, N.A. Shah, P.S. Solanki
    Saurashtra University, Rajkot, India
  • K. Asokan
    IUAC, New Delhi, India
  • K.H. Chae, J.P. Singh
    Korea Institute of Science and Technology, Advanced Analysis Center, Seoul, Republic of Korea
  Researchers concentrated on resistive random access memories (RRAMs) due to excellent scalability, high integration density, quick switching, etc*,**. Intrinsic physical phenomenon of RRAMs is resistive switching. In this work, ion beam irradiation was used as a tool to modify resistive switching of pulsed laser deposited (PLD) Y0.95Ca0.05MnO3/Si films. Ion irradiation induced optimal resistive switching with spectroscopic correlations has been attributed to oxygen vacancy gradient. Resistive switching ratio is estimated to be increased for the film irradiated with fluence 1×1011 ions/cm2 due to irradiation induced strain and oxygen vacancies verified by X’ray diffraction (XRD), Raman, atomic force microscopy (AFM), Rutherford backscattering spectrometry (RBS) and near-edge X-ray absorption fine structure (NEXAFS) measurements. Strain relaxation and oxygen vacancy annihilation have been realized for higher fluence (1×1012 and 1×1013 ions/cm2) owing to local annealing effect. Present study suggests that the films understudy can be considered as emerging candidates for RRAMs.
* X.J. Zhu et al., Front. Mater. Sci. 6 (2012) 183, 206.
** D.S. Jeong et al., Rep. Prog. Phys. 75 (2012) 076502:1,31.
poster icon Poster MOPLS01 [0.741 MB]  
MOPLS06 Mu*STAR: An Accelerator-Driven Subcritical Modular Reactor -1
  • R.P. Johnson, R.J. Abrams, M.A. Cummingspresenter, T.J. Roberts
    Muons, Inc, Illinois, USA
  We present a conceptual design for a new modular, accelerator-driven subcritical reactor based on a molten salt. Mu*STAR is a reactor, that without re-design, can burn a variety of nuclear fuels, with the beam tuned to that fuel. We will discuss the elements of this system: the accelerator, the reactor, the spallation target, and the fractional distillation to separate volatile fission products. Our GAIN project with ORNL is successfully completed, with a design of the Fuel Processing Plant that will convert spent nuclear fuel into the molten-salt fuel for Mu*STAR.  
Commissioning of an Accelerator-Driven High-Brightness Source for Fast Neutron Imaging  
  • B. Rusnak, R.A. Marshpresenter
    LLNL, Livermore, California, USA
  Funding: This work performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.
Lawrence Livermore National Laboratory (LLNL) is building an intense, high-brightness fast neutron source to create sub-millimeter-scale neutron radiographs and images. An intense source (2x1010 n/s/sr at 0 degrees) of fast neutrons allows for penetrating very thick, dense objects while preserving the ability to create good image contrast in low density features within the object and maintaining high detector response efficiency. Fast neutrons will be produced using a pulsed 4 MeV, 150 microamp average-current commercial ion accelerator that will deliver deuteron bunches to a neutron producing target. Progress on the building of the lab-scale demonstration machine shall be presented, along with commissioning progress and current status.
MOPLS08 Error Tolerance Characterization for the HUST MeV Ultrafast Electron Diffraction System -1
  • Y. Song, K. Fan, C.-Y. Tsaipresenter
    HUST, Wuhan, People’s Republic of China
  Ultrafast electron diffraction (UED) is a powerful tool for probing atomic dynamics with a femtosecond resolution. Such a spatiotemporal resolution requires error tolerance for the UED system which includes the RF system, the laser system, the beamline elements, etc. To characterize the error tolerance of the required spatiotemporal resolution for the 1.4-cell MeV UED we are developing, we use ASTRA to simulate the UED model with errors including initial transverse beam centroid offset, RF amplitude jitter and injection phase jitter, etc. By performing simulations with different errors omitted, we can characterize the contribution of each error and thus set the tolerance for each error to obtain the required performance of UED experiment. In the end, we present the error tolerance for 10% emittance growth and 100 fs time of flight variation to maintain the required spatiotemporal resolution.  
MOPLS09 Engineering Design of Gallium-Nickel Target in Niobium Capsule, with a Major Focus on Determining the Thermal Properties of Gallium-Nickel Through Thermal Testing and FEA, for Irradiation at BLIP -1
  • S.K. Nayak, S. Bellavia, H. Chelminski, C.S. Cutler, D. Kim, D. Medvedev
    BNL, Upton, New York, USA
  Funding: Funding:This abstract is authored by BSA operated under contract number DE-SC0012704. This research is supported by the U.S. DOE Isotope Program, managed by the Office of Science for Nuclear Physics.
The Brookhaven Linac Isotope Producer (BLIP) produces several radioisotopes using a variable energy and current proton beam. The targets irradiated at BLIP are cooled by water and required to be isolated in a target capsule. During the design stage, thermal analysis of the target and cladding is carried out to determine the maximum beam power a target can handle during irradiation without destruction. In this work we designed a capsule for Gallium-Nickel (Ga 80%, Ni 20%) alloy target material and irradiated the target at the BLIP to produce the radioisotope Ge-68. Since no literature data is available on Ga4Ni’s thermal conductivity (K) and specific heat (C), measurements were carried out using thermal testing in conjunction with Finite Element Analysis (FEA). Steady-state one dimensional heat conduction method was used to determine the thermal conductivity. Transient method was used to calculate the specific heat. The test setup with same methodologies can be used to assess other targets in the future. Here, we will detail these studies and discuss the improved design and fabrication of this target.
poster icon Poster MOPLS09 [0.688 MB]