Materials that undergo controllable structural and property changes upon external stimuli are known as stimuli-responsive or “smart” materials. Understanding the transitional pathway and the out-of-equilibrium state of their micro-structures are crucial for the establishment of a dynamic structure-property relationship. With increasing neutron flux, time-resolved small angle neutron scattering...
High Current Accelerator driven Neutron Sources (HiCANS) are considered as the next generation medium flux neutron facility taking over the role of today’s national neutron sources. The High Brilliance Source HBS will provide dedicated target stations delivering ~ 100 kW proton beam power, where the instruments around the target station define the pulse and spectral properties of the neutrons...
We have been developing a 3He neutron spin filter (NSF) for the efficient utilization of pulsed neutrons, since the 3He NSF is effective for neutrons in the wide energy range. The 3He NSF is effective especially for neutrons with energy higher than several-tens-meV. It also can cover a large solid angle and polarize neutrons without deflecting them from their original trajectory, it is...
As one of the important auxiliary devices for neutron scattering instruments, sample environment provides various experimental conditions to enhance the research capabilities of the instruments. The sample environment at the Chinese Spallation Neutron Source (CSNS) has been providing in-situ experimental services since the commissioning of the instrument in 2018. It has evolved from initially...
Spherical Neutron Polarimetry (SNP) is a powerful technique which can measure the variation of polarization directions between incident and scattered neutron. Using this technique, the directional and phase information of the magnetic structure factor can be determined. This technique has been achieved by Meissner effect or high permeability alloys to produce zero-field environment.
We are...
High pressure is an important pathway to access and understand the properties of materials as well as their various phases in the fields ranging from mineral physics inside the earth to cooperative many-body quantum phases emerging in crystals.
At PSI we combine the high-pressures with accelerator-based scattering and resonance methods in order to explore, understand and control theses...
Conventional neutron scattering techniques encounter limitations when measuring scattering events characterized by small momentum or energy transfers due to the inherent trade-off between resolution and useable flux. To address this challenge, we explore the innovative utilization of neutron spin Larmor precession. By harnessing this phenomenon, it becomes possible to encode neutron momentum...
Muon spin spectroscopy, known as a collection of muon spin rotation, relaxation and resonance (μSR) techniques, uses highly polarized muons to study the microscopic magnetic structure and dynamics of condensed matter. The interaction between muon spins and the local field inside materials forms the physical basis of μSR techniques. Such information is extracted by the detection of positrons...
There are two neutron facilities at Oak Ridge national laboratory(ORNL): High Flux Isotope Reactor(HFIR) with the world’s highest continuous neutron brightness and Spallation Neutron Source(SNS) with the world’s highest peak neutron brightness. Supported by the powerful neutron sources of SNS and HFIR, the diffraction instruments at ORNL have developed world leading capabilities on high...