Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor

G. E. Granroth; M. Daum; A. A. Aczel; T. J. Williams; B. Winn; J. A. Fernandez-Baca; M. Mourigal; M. D. Lumsden

doi:10.1016/j.nima.2024.169440

Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor

G. E. Granroth, M. Daum, A. A. Aczel, T. J. Williams, B. Winn, J. A. Fernandez-Baca, M. Mourigal, M. D. Lumsden

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1 Scopus citations

Abstract

A modern cold triple axis spectrometer is being planned for the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Here, we describe the design of an incident beamline that will put a flux of ∼10[Formula presented] on a sample with an area of 2 cm × 2 cm. It takes current physical constraints at HFIR into account and it can accommodate both single and multiplexed analyzer-detector secondary spectrometers and large superconducting magnets. The proposed incident beamline includes a multi-channel guide with horizontal focusing, a neutron velocity selector, components to facilitate an incident beam polarization option, and a double-focusing pyrolytic graphite monochromator. This work describes the process of optimizing the guide system and monochromator and summarizes the expected performance of the incident beamline for non-polarized operation.

Original language	English
Article number	169440
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	1064
DOIs	https://doi.org/10.1016/j.nima.2024.169440
State	Published - Jul 2024

Funding

We are grateful for useful discussions with M. Hoffman, L. Robertson and L. Crow on building constraints. We had insightful discussions on instrument design concepts with T. Hong, C. Schanzer, L. Crow, and G. Sala. We thank T. Huegle for help with the tally components for determining the guide m value. We thank M. Frost for early access to the source parameters. We are grateful to S. Chi for providing flux measurements for the HB-3 spectrometer. B. McHargue provided current details on the neutron velocity selector design. The work of M. Daum was supported by the U.S. Department of Energy (USDOE), Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education for the DOE under contract number DE-SC0014664. This research used resources of the High Flux Isotope Reactor, which is an USDOE Office of Science User Facility.

Keywords

Neutron beam modeling
Neutron instrumentation
Neutron simulations
Triple axis spectrometer

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10.1016/j.nima.2024.169440

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Granroth, G. E., Daum, M., Aczel, A. A., Williams, T. J., Winn, B., Fernandez-Baca, J. A., Mourigal, M., & Lumsden, M. D. (2024). Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1064, Article 169440. https://doi.org/10.1016/j.nima.2024.169440

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title = "Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor",

abstract = "A modern cold triple axis spectrometer is being planned for the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Here, we describe the design of an incident beamline that will put a flux of ∼10[Formula presented] on a sample with an area of 2 cm × 2 cm. It takes current physical constraints at HFIR into account and it can accommodate both single and multiplexed analyzer-detector secondary spectrometers and large superconducting magnets. The proposed incident beamline includes a multi-channel guide with horizontal focusing, a neutron velocity selector, components to facilitate an incident beam polarization option, and a double-focusing pyrolytic graphite monochromator. This work describes the process of optimizing the guide system and monochromator and summarizes the expected performance of the incident beamline for non-polarized operation.",

keywords = "Neutron beam modeling, Neutron instrumentation, Neutron simulations, Triple axis spectrometer",

author = "Granroth, \{G. E.\} and M. Daum and Aczel, \{A. A.\} and Williams, \{T. J.\} and B. Winn and Fernandez-Baca, \{J. A.\} and M. Mourigal and Lumsden, \{M. D.\}",

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doi = "10.1016/j.nima.2024.169440",

language = "English",

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Granroth, GE, Daum, M, Aczel, AA, Williams, TJ, Winn, B, Fernandez-Baca, JA, Mourigal, M & Lumsden, MD 2024, 'Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 1064, 169440. https://doi.org/10.1016/j.nima.2024.169440

Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor. / Granroth, G. E.; Daum, M.; Aczel, A. A. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1064, 169440, 07.2024.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor

AU - Granroth, G. E.

AU - Daum, M.

AU - Aczel, A. A.

AU - Williams, T. J.

AU - Winn, B.

AU - Fernandez-Baca, J. A.

AU - Mourigal, M.

AU - Lumsden, M. D.

PY - 2024/7

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N2 - A modern cold triple axis spectrometer is being planned for the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Here, we describe the design of an incident beamline that will put a flux of ∼10[Formula presented] on a sample with an area of 2 cm × 2 cm. It takes current physical constraints at HFIR into account and it can accommodate both single and multiplexed analyzer-detector secondary spectrometers and large superconducting magnets. The proposed incident beamline includes a multi-channel guide with horizontal focusing, a neutron velocity selector, components to facilitate an incident beam polarization option, and a double-focusing pyrolytic graphite monochromator. This work describes the process of optimizing the guide system and monochromator and summarizes the expected performance of the incident beamline for non-polarized operation.

AB - A modern cold triple axis spectrometer is being planned for the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Here, we describe the design of an incident beamline that will put a flux of ∼10[Formula presented] on a sample with an area of 2 cm × 2 cm. It takes current physical constraints at HFIR into account and it can accommodate both single and multiplexed analyzer-detector secondary spectrometers and large superconducting magnets. The proposed incident beamline includes a multi-channel guide with horizontal focusing, a neutron velocity selector, components to facilitate an incident beam polarization option, and a double-focusing pyrolytic graphite monochromator. This work describes the process of optimizing the guide system and monochromator and summarizes the expected performance of the incident beamline for non-polarized operation.

KW - Neutron beam modeling

KW - Neutron instrumentation

KW - Neutron simulations

KW - Triple axis spectrometer

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JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

M1 - 169440

ER -

Incident beamline design for a modern cold triple axis spectrometer at the High Flux Isotope Reactor

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