Additive-Manufactured and Topology-Optimized Permanent-Magnet Spin Rotator for Neutron Interferometry

Author(s)
Wenzel Kersten, Laurids Brandl, Richard Wagner, Christian Huber, Florian Bruckner, Yuji Hasegawa, Dieter Suess, Stephan Sponar
Abstract

In neutron-interferometric experiments using polarized neutrons, coherent spin-rotation control is indispensable. In this article, we present a method for Larmor spin rotation around an axis parallel to the outer guide field using topology-optimized three-dimensional (3D) printed magnets. The use of 3D-printed magnets instead of magnetic coils avoids unwanted inductances and offers the advantage of no heat dissipation, which prevents potential loss in interferometric contrast (fringe visibility) due to temperature gradients in the interferometer. We use topology optimization to arrive at a design of the magnet geometry that is optimized for homogeneity of the magnetic action over the neutron-beam profile and adjustability by varying the distance between the 3D-printed magnets. We verify the performance in polarimetric and interferometric neutron experiments.

Organisation(s)
Physics of Functional Materials
External organisation(s)
Technische Universität Wien, Hokkaido University
Journal
Physical Review Applied
Volume
12
No. of pages
8
ISSN
2331-7019
DOI
https://doi.org/10.1103/PhysRevApplied.12.014023
Publication date
07-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
Quantum mechanics, Nuclear physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/additivemanufactured-and-topologyoptimized-permanentmagnet-spin-rotator-for-neutron-interferometry(53777698-18fc-4407-8cf1-ba1190a57a38).html