Work

Magnetic-lens-generated polarized neutron beam with enhanced intensity and Q resolution for small-angle neutron scattering

Year: 2025

Type: article

Abstract: We installed a 30 mm-bore 3.2 m-long magnetic lens in the small-angle neutron scattering diffractometer (SANS-J) at the Japan Research Reactor 3 to focus the neutron beam near the sample position for measurements at Q > 0.1 nm −1 . The focused beam at the sample position was over three times more intense than the standard non-focused beam, while the Q resolution was improved. The positive spin component of the neutron beam was focused near the sample, whereas the negative spin component was defocused and blocked by the slit just in front of the sample, producing a polarized beam. The 8 mm-diameter focusing polarized beam achieved a polarization of 0.95–0.96 and an intensity up to 22 times greater than that of a non-focusing polarized beam with the same collimation length. Using this beam with a remanent supermirror-coated spin analyser, we demonstrate that polarization analysis measurements of hydrogen-containing samples can be completed within tens of minutes.

Source: Journal of Applied Crystallography

DOI: 10.1107/s1600576725010246

Authors: Kosuke Hiroi, Rintaro Nakabe, Takayuki Oku, Takayuki Kumada, Ryuhei Motokawa

Institutions: Japan Atomic Energy Agency, Japan Proton Accelerator Research Complex

Language: English

Topic: Nuclear Physics and Applications

Subfield: Radiation

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $5,110

Funder: Ministry of Education, Culture, Sports, Science and Technology