ORNL High Flux Isotope Reactor GP-SANS Polarizer

AMENDMENT 02: Extends Date Offers Due to 08/03/2026. CORRECTS Drawing Number in Attachment A - HFIR GP-SANS V-Cavity Equipment Specification Corrected.ADDS Attachment G - Drawing CG2-M-20-U-0018-R00 and Subdrawings. The High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) is a high-flux research reactor that, in addition to isotope production, serves as a steady-state neutron source for a suite of neutron scattering instruments. Among these, the General-Purpose Small-Angle Neutron Scattering (GP-SANS) instrument is being upgraded to incorporate incident beam polarization capabilities. This enhancement will enable spin-resolved SANS measurements, allowing for the separation of nuclear and magnetic scattering components and facilitating studies of magnetic order, spin textures, and correlated spin structures. A critical component of this upgrade is the integration of a polarizing cavity, which utilizes magnetized supermirrors or transmission-based polarizers to produ…

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