Speaker
Description
Neutron scattering is an established method for investigating the static and dynamic properties of materials. However, many interesting studies can only be performed on small samples and typically require bulky, extreme environments. Furthermore, since the brilliance of existing neutron sources is limited for technical reasons, sophisticated neutron optics are needed to transport and focus the neutrons and select their polarization. Key elements in this field are high-performance supermirror coatings, whose properties can be largely tailored to specific requirements.
This poster presents novel optical neutron components that improve neutron beam guidance by optimizing brilliance transfer and preserving phase space. First, methods for the efficient transport of neutron beams from the moderator to the sample are introduced. Then, an overview of various concepts for beam extraction and guidance, as well as for focusing neutron beams using nested mirror optics (NMOs), is provided. NMOs enable phase-space selection (beam size, divergence) of neutrons far from the sample position, thereby increasing the available scattering intensity and reducing background noise. Polarizing supermirrors with excellent reflectivity allow the fabrication of highly efficient transmission polarizers, even for divergent neutron beams. This minimizes beam losses in the polarization system while preserving phase space. Finally, combinations of polarizers and RF spin flippers, known as spin selectors, result in devices that do not require complex optimization during use.