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Related Experiment Video

Updated: May 21, 2025

$Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2$

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

Published on: December 8, 2016

Optical design for the single crystal neutron diffractometer Pioneer.

Yaohua Liu¹, Peter Torres¹, Scott Dixon¹

¹Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

The Review of Scientific Instruments

|March 17, 2025

Summary

This summary is machine-generated.

Pioneer, a new neutron diffractometer, is designed for small samples and weak signals. Its optical design optimizes neutron transport and enhances weak signal detection using advanced collimators and components.

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Area of Science:

Neutron scattering
Materials science
Instrumentation

Background:

Oak Ridge National Laboratory's Second Target Station requires advanced instrumentation.
Small-volume samples and weak signals present significant challenges in neutron diffraction.

Purpose of the Study:

To present the preliminary optical design of the Pioneer neutron diffractometer.
To detail the design choices for optimizing performance with small samples and weak signals.

Main Methods:

Design of T0 and bandwidth disk choppers for neutron transport.
Integration of a guide and beam control system with a polarizing V-cavity.
Implementation of slit packages, absorbing panels, and specialized collimators (oscillating radial and fixed multi-cone).

Main Results:

Optimized chopper locations for maximized neutron transport.
Strategic gaps in guide design to accommodate essential components like maintenance shields and shutters.
Oversized collimators designed for translation into the beam path when optical components are retracted.
Placement of absorbing panels to minimize background noise.
Selection of specific collimators for vertical cylindrical and bottom flat detectors to enhance weak signal detection.

Conclusions:

The optical design of Pioneer effectively addresses challenges of small-volume samples and weak signals.
The instrument is poised to enable sensitive measurements even in complex sample environments.
Pioneer represents a significant advancement in neutron diffraction capabilities at Oak Ridge National Laboratory.