2020 Review of the Instrument Suite for Spectroscopy at the Spallation Neutron Source and High Flux Isotope Reactor September 17–18, 2020 CONTENTS CONTENTS .................................................................................................................................................... iii LIST OF FIGURES ........................................................................................................................................... xi LIST OF TABLES ......................................................................................................................................... xviii 1. Introduction to the Spectroscopy Suite at SNS / HFIR .......................................................................... 1 1.1 Recommendations from the 2017 Suite Review ........................................................................ 2 1.2 Triple-Axis Spectrometers ........................................................................................................... 3 1.3 Direct Geometry Spectrometers ................................................................................................. 4 1.4 Chemical Spectroscopy ............................................................................................................... 6 1.5 Upgrades and Developments ...................................................................................................... 8 Triple-Axis Spectroscopy ............................................................................................................. 8 Direct Geometry Spectroscopy ................................................................................................... 9 Chemical Spectroscopy ............................................................................................................. 10 1.6 Critical needs for new instruments ........................................................................................... 11 New instruments for HFIR ......................................................................................................... 11 New instruments for FTS .......................................................................................................... 12 New instruments for STS .......................................................................................................... 13 1.7 Software .................................................................................................................................... 14 Data Reduction ......................................................................................................................... 14 Data Acquisition ........................................................................................................................ 14 Data Visualization and Analysis ................................................................................................ 15 1.8 Staffing ...................................................................................................................................... 16 2. HFIR HB-1 Polarized Triple-axis Spectrometer Beamline Status and Planning Summary .................. 18 2.1 Overview/Current Status .......................................................................................................... 18 2.2 Scientific Focus .......................................................................................................................... 19 2.3 Scientific Highlights ................................................................................................................... 20 New capabilities in high-resolution neutron Larmor diffraction at ORNL. ............................... 20 High-resolution phonon energy shift measurements with the inelastic neutron spin echo technique. ........................................................................................................... 21 Dual nature of Magnetism in a uranium heavy-fermion system .............................................. 22 Origin of net magnetic moment in LaCoO3 ............................................................................... 23 Unique helical magnetic order and field-induced phase in trillium lattice antiferromagnet EuPtSi. ............................................................................................... 24 2.4 General User Program .............................................................................................................. 25 2.5 Update on Instrument Development Activities ........................................................................ 25 2.6 Sample Environment ................................................................................................................. 26 2.7 Software .................................................................................................................................... 26 2.8 Update on Impact of Discretionary Beamtime ......................................................................... 26 2.9 Outreach and Expansion Activities ........................................................................................... 26 2.10 Vision ......................................................................................................................................... 26 2.10.1 Near-term Vision (1-3 years) ........................................................................................ 26 2.10.2 Strategic Vision (3-10 years) and Alignment with NScD/ORNL Strategic Plans ........... 27 2.11 Funding/Resource Needs .......................................................................................................... 27 2.11.1 Future Funding Opportunities ..................................................................................... 27 2.12 Self-assessment ......................................................................................................................... 28 Strengths ................................................................................................................................... 28 iii Weaknesses (Limitations) ......................................................................................................... 28 Opportunities ............................................................................................................................ 28 Threats 28 2.13 Executive Summary ................................................................................................................... 29 2.13.1 Comparison of instrument specifications to similar instrument worldwide ............... 30 2.13.2 Comparison of sample environment capabilities with similar instruments worldwide .................................................................................................................... 31 2.13.3 Data and computing capabilities ................................................................................. 31 3. HFIR HB-3 Triple Axis Spectrometer Beamline Status and Planning Summary .................................. 33 3.1 Overview/Current Status .......................................................................................................... 33 Team Structure ......................................................................................................................... 33 3.2 Scientific Focus .......................................................................................................................... 34 3.3 Scientific Highlights ................................................................................................................... 35 Temperature dependence of low-E magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As ....................................................................................................... 35 Supersonic propagation of lattice energy by phasons in fresnoite .......................................... 36 f-Electron States in PrPd5Al2 ..................................................................................................... 37 Low-T anharmonicity and the thermal conductivity of cesium iodide ..................................... 38 Anharmonic Eigenvectors and Acoustic phonon Disappearance in Quantum Paraelectric SrTiO3 ........................................................................................................................... 39 3.4 General User Program .............................................................................................................. 40 3.5 Update on Instrument Development Activities ........................................................................ 41 Omega shielding around the sample position. ......................................................................... 41 Velocity Selector ....................................................................................................................... 42 New analyzer tank wedge lifter system .................................................................................... 42 3.6 Sample Environment ................................................................................................................. 42 3.7 Software .................................................................................................................................... 42 3.8 Impact of Discretionary Beam Time .......................................................................................... 43 3.9 Outreach and Expansion Initiatives .........................................................................................