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3D-printed B₄C collimation for neutron pressure cells.

Bianca Haberl¹, Jamie J Molaison¹, Matthias Frontzek¹

¹Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

The Review of Scientific Instruments

|October 2, 2021

Summary

This summary is machine-generated.

We developed novel 3D-printed neutron collimators for high-pressure experiments. These advanced collimators offer improved performance and enable complex designs for neutron scattering instruments.

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Area of Science:

Materials Science
Neutron Scattering
High-Pressure Physics

Background:

Incident-beam collimators are crucial for neutron scattering experiments.
Traditional collimators have design limitations.
The Paris-Edinburgh pressure cell requires specialized collimators.

Purpose of the Study:

To design and fabricate novel incident-beam collimators for the Paris-Edinburgh pressure cell.
To evaluate the performance of 3D-printed and composite collimators.
To explore advanced collimator designs using 3D printing.

Main Methods:

Fabrication of collimators using reaction-bonded B4C and 3D-printing.
Characterization of four collimator types: B4C, 3D-printed, glue-infiltrated, glue-free tip, and enriched 10B4C tip.
Performance evaluation at Oak Ridge National Laboratory's neutron scattering facilities.

Main Results:

3D-printed collimators demonstrate comparable performance to traditional ones.
Composite collimators, particularly those with enriched 10B4C tips, show enhanced neutronic characteristics.
3D printing enables the creation of complex collimator geometries, including those for single-crystal samples in diamond anvil cells.

Conclusions:

3D-printed collimators are a viable and cost-effective alternative.
Composite designs offer superior performance for neutron scattering.
3D printing opens new possibilities for advanced collimator designs in high-pressure and extreme environment research.