exTAS: a new concept in three axis spectroscopy for small samples

International Workshop on Neutron Optics and Detectors

Piovano, A.^1 ; Roux, S.^1 ; Kulda, J.^1

Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France^1

关键词: Characterization techniques;    Delivery systems;    Momentum resolutions;    Neutron focusing;    Neutron spectroscopy;    Positioning accuracy;    Sample environment;    Sensitivity limit;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/528/1/012027/pdf
DOI  :  10.1088/1742-6596/528/1/012027

来源: IOP

【 摘 要 】

The progress in neutron delivery systems and in neutron focusing techniques has made possible neutron studies of excitations in sub-cm3-sized single crystals, which are still much larger than crystal sizes needed for standard laboratory characterization techniques. In an effort to further reduce this gap we are proposing the exTAS project, which intends to stimulate a paradigm shift towards the use of mm3-sized samples in neutron spectroscopy. The exTAS project aims to boost the TAS sensitivity limits by combining sharp mm-sized focal spots, minimizing penumbra effects in sample environment illumination, with a spectrometer layout downscaled to a tabletop size and enclosed in a shielding casemate. The reduced spectrometer dimensions will provide enhanced flexibility in adapting the momentum resolution to the problem being studied and will facilitate the sub-millimetre positioning accuracy of its components, matching the reduced focal spot size.