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

Publication Type
Journal
Journal Name
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication Date
Page Number
169440
Volume
1064

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 ~ 10^8 n/cm^2/s on a sample with an area of 2 cm x 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.