Sourcing and reducing sample environment background in low-temperature high-pressure neutron scattering experiments

Zhanwen Ma*, Jakob Lass, Daniel Mazzone, Gediminas Simutis, Sascha Thürsam, Tom Fennell, Ekaterina Pomjakushina, Marek Bartkowiak, Stanislav Nikitin, Mads Bertelsen, Peter Willendrup, Uwe Filges, Christine Klauser

*Corresponding author for this work

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Abstract

Neutron scattering in high-pressure environments offers unique opportunities to measure the physical properties of matter but faces challenges due to low signal intensity and high background noise. In this study, Monte Carlo simulations were employed to identify background sources in low-temperature and high-pressure sample environments at the SINQ instrument CAMEA. Simulation results suggest that the piston pressure cell (PC) contributes significantly to the background noise in neutron scattering experiments. To counter this background, a compact radial neutron collimator was developed to reduce background in the sample environment, and its performance was evaluated experimentally. Measurements show that the collimator reduces the background generated by the PC effectively, especially for low q. Noise from the collimator was observed, and strategies to address this issue were discussed.

Original languageEnglish
Article number169634
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume1066
Number of pages8
ISSN0168-9002
DOIs
Publication statusPublished - 2024

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