CHESS: The future direct geometry spectrometer at the second target station

G. Sala, M. Mourigal, C. Boone, N. P. Butch, A. D. Christianson, O. Delaire, A. J. Desantis, C. L. Hart, R. P. Hermann, T. Huegle, D. N. Kent, J. Y.Y. Lin, M. D. Lumsden, M. E. Manley, D. G. Quirinale, M. B. Stone, Y. Ze

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

CHESS, chopper spectrometer examining small samples, is a planned direct geometry neutron chopper spectrometer designed to detect and analyze weak signals intrinsic to small cross sections (e.g., small mass, small magnetic moments, or neutron absorbing materials) in powders, liquids, and crystals. CHESS is optimized to enable transformative investigations of quantum materials, spin liquids, thermoelectrics, battery materials, and liquids. The broad dynamic range of the instrument is also well suited to study relaxation processes and excitations in soft and biological matter. The 15 Hz repetition rate of the Second Target Station at the Spallation Neutron Source enables the use of multiple incident energies within a single source pulse, greatly expanding the information gained in a single measurement. Furthermore, the high flux grants an enhanced capability for polarization analysis. This enables the separation of nuclear from magnetic scattering or coherent from incoherent scattering in hydrogenous materials over a large range of energy and momentum transfer. This paper presents optimizations and technical solutions to address the key requirements envisioned in the science case and the anticipated uses of this instrument.

Original languageEnglish
Article number065109
JournalReview of Scientific Instruments
Volume93
Issue number6
DOIs
StatePublished - Jun 1 2022

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). G.S. acknowledges useful discussions with A. Khaplanov (ORNL), P. Deen (ESS), R. Bewley (ISIS), K. Kaneko, S. Ohira-Kawamura and K. Nakajima (J-PARC), and M. Janoschek (PSI). G.S. is also very grateful to all users who supported CHESS during the STS instrument selection process. Work at ORNL’s Spallation Neutron Source by G.S., C.B., A.D.C., C.L.H., D.N.K., J.Y.Y.L., M.D.L., D.G.Q., and M.B.S. was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy (DOE). Work by A.D.C., R.P.H., and M.E.M. was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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