A concept of a broadband inverted geometry spectrometer for the Second Target Station at the Spallation Neutron Source.

BWAVES is an acronym for Broadband Wide-Angle VElocity Selector spectrometer, indicating that a novel WAVES (Wide-Angle VElocity Selector) device will be used to select the velocity/wavelength of the detected neutrons after they are scattered by the sample. We describe a conceptual design of BWAVES, a time-of-flight broadband inverted-geometry neutron spectrometer for the Second Target Station at the Spallation Neutron Source operated by Oak Ridge National Laboratory. Being the first inverted geometry spectrometer where the energy of the detected neutrons can be chosen by a WAVES device mechanically, irrespective of the limitations imposed by the crystal analyzers or filters, BWAVES will feature a uniquely broad, continuous dynamic range of measurable energy transfers, spanning 4.5 decades. This will enable measurements of both vibrational and relaxational excitations within the same, continuous scattering spectra. Novel approaches that are necessary for the implementation of a WAVES device at the BWAVES spectrometer will result in a spectrometer with the design and characteristics much different from those displayed by the neutron spectrometers in existence today.

[1]  E. Mamontov,et al.  Low rotational barriers for the most dynamically active methyl groups in the proposed antiviral drugs for treatment of SARS-CoV-2, apilimod and tetrandrine , 2021, Chemical Physics Letters.

[2]  E. Mamontov,et al.  Hydration-Induced Disorder Lowers the Energy Barriers for Methyl Rotation in Drug Molecules. , 2020, The journal of physical chemistry letters.

[3]  K. Lefmann,et al.  McStas (ii): An overview of components, their use, and advice for user contributions , 2020, Journal of Neutron Research.

[4]  Kim Lefmann,et al.  McStas (i): Introduction, use, and basic principles for ray-tracing simulations , 2020, Journal of Neutron Research.

[5]  Timothy K. Soh,et al.  Inhibition of PIKfyve kinase prevents infection by Zaire ebolavirus and SARS-CoV-2 , 2020, Proceedings of the National Academy of Sciences.

[6]  Eytan Ruppin,et al.  Discovery of SARS-CoV-2 Antivirals through Large-scale Drug Repositioning , 2020, Nature.

[7]  E. Mamontov,et al.  Uncoupling between the lipid membrane dynamics of differing hierarchical levels. , 2020, Physical review. E.

[8]  Jiao Y. Y. Lin,et al.  Recent developments of MCViNE and its applications at SNS , 2019, Journal of Physics Communications.

[9]  A. Magerl,et al.  First results with the neutron backscattering and TOF spectrometer option BATS on IN16B , 2019, Physica B: Condensed Matter.

[10]  G. Kobinger,et al.  Ebola virus requires phosphatidylinositol (3,5) bisphosphate production for efficient viral entry. , 2018, Virology.

[11]  R. Guha,et al.  The phosphatidylinositol-3-phosphate 5-kinase inhibitor apilimod blocks filoviral entry and infection , 2017, PLoS neglected tropical diseases.

[12]  E. Mamontov,et al.  A neutron spectrometer concept implementing RENS for studies in life sciences. , 2017, Biochimica et biophysica acta. General subjects.

[13]  E. Mamontov.  A novel approach to neutron scattering instrumentation for probing multiscale dynamics in soft and biological matter , 2016, Journal of physics. Condensed matter : an Institute of Physics journal.

[14]  Jiao Y. Y. Lin,et al.  MCViNE – An object oriented Monte Carlo neutron ray tracing simulation package , 2015, 1504.02776.

[15]  E. Mamontov,et al.  Differential Microscopic Mobility of Components within a Deep Eutectic Solvent. , 2015, The journal of physical chemistry letters.

[16]  A. Sokolov,et al.  Protein dynamics: from rattling in a cage to structural relaxation. , 2015, Soft matter.

[17]  E. Mamontov,et al.  Nanoscopic dynamics of phospholipid in unilamellar vesicles: effect of gel to fluid phase transition. , 2015, The journal of physical chemistry. B.

[18]  E. Mamontov.  New opportunities for quasielastic and inelastic neutron scattering at steady-state sources using mechanical selection of the incident and final neutron energy , 2015 .

[19]  E. Mamontov.  Wide-angle mechanical velocity selection for scattered neutrons in inelastic neutron spectrometers , 2014 .

[20]  G. J. Schneider,et al.  SPHERES, Jülich's high-flux neutron backscattering spectrometer at FRM II. , 2012, The Review of scientific instruments.

[21]  A. Sokolov,et al.  Role of methyl groups in dynamics and evolution of biomolecules , 2012, Journal of Biological Physics.

[22]  Jeremy C. Smith,et al.  Three classes of motion in the dynamic neutron-scattering susceptibility of a globular protein. , 2011, Physical review letters.

[23]  E. Mamontov,et al.  A time-of-flight backscattering spectrometer at the Spallation Neutron Source, BASIS. , 2011, The Review of scientific instruments.

[24]  E. Mamontov,et al.  Recent Backscattering Instrument Developments at the ILL and SNS , 2010 .

[25]  P. A. Seeger,et al.  Resolution of VISION, a crystal-analyzer spectrometer , 2009 .

[26]  H. Frauenfelder,et al.  A unified model of protein dynamics , 2009, Proceedings of the National Academy of Sciences.

[27]  E. Mamontov,et al.  Proton dynamics in N,N,N',N'-Tetramethylguanidinium Bis(perfluoroethylsulfonyl)imide protic ionic liquid probed by quasielastic neutron scattering. , 2009, The journal of physical chemistry. B.

[28]  S. I. Campbell,et al.  Spectroscopic characteristics of the OSIRIS near-backscattering crystal analyser spectrometer on the ISIS pulsed neutron source. , 2005, Physical chemistry chemical physics : PCCP.

[29]  P. Gehring,et al.  The high-flux backscattering spectrometer at the NIST Center for Neutron Research , 2002, cond-mat/0209153.

[30]  F. Sacchetti,et al.  TOSCA neutron spectrometer: The final configuration , 2002 .

[31]  S. I. Campbell,et al.  Performance of the new pyrolytic graphite analyser bank on the near-backscattering spectrometer IRIS on the ISIS pulsed source , 2002 .

[32]  C. Carlile,et al.  The design of the IRIS inelastic neutron spectrometer and improvements to its analysers , 1992 .