Work

Permanent magnet array with reduced stray field designed for a neutron supermirror polarizer

Year: 2025

Type: article

Abstract: We present a design of a permanent magnet (PM) assembly for a large volume that allows the reduction of long-range external stray fields through magnetic self compensation while also yielding a higher central field. The array described here was developed for a neutron polarization analyzer comprising a large-area supermirror (SM) array. The resulting array is self-compensated because it utilizes two groups of PM with equal but opposite dipole moments and involves modification to a permanent magnet based window-frame magnet. The principles of self compensation with permanent magnets presented are generally applicable for other applicaitons where large volume magnetic fields with low stray field are required.

Source: Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

DOI: 10.1016/j.nima.2025.170552