6th European Conference on Neutron Scattering | |
7C2, the new neutron diffractometer for liquids and disordered materials at LLB | |
Cuello, G.J.^1 ; Darpentigny, J.^2 ; Hennet, L.^2,3 ; Cormier, L.^4 ; Dupont, J.^2 ; Homatter, B.^2 ; Beuneu, B.^2 | |
Institut Laue Langevin, av des Martyrs 71, Grenoble | |
38042, France^1 | |
Laboratoire Léon Brillouin, CEA-CNRS, CEA Saclay, Gif sur Yvette Cedex | |
91191, France^2 | |
CEMHTI, University of Orléans, Orléans Cedex 02 | |
45071, France^3 | |
Institut de Minéralogie de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7590, Museum National d'Histoire Naturelle, IRD UMR 206, 4 place Jussieu, Paris | |
75005, France^4 | |
关键词: Comparative advantage; Cylindrical surface; Diffraction measurements; Diffractograms; Disordered materials; Multi-detectors; Neutron diffractometer; Sample position; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012020/pdf DOI : 10.1088/1742-6596/746/1/012020 |
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来源: IOP | |
【 摘 要 】
The disordered-materials diffractometer 7C2 at the Laboratoire Leon Brillouin (LLB), Saclay, France has been upgraded through the replacement of its detector. The old one, a banana like BF3detector, has been replaced by a new ensemble of3He tubes arranged on a cylindrical surface concentric with the sample position, covering an angular range of 133°, with an angular step of 0.52°. At the shortest wavelength, 0.57 Å, this represents a maximum momentum transfer of 20 Å-1. The gas pressure in the3He tubes is 30 bars, which increases the efficiency to 80% for 0.72 Å neutrons, compared to 17% for the previous detector. A larger solid angle of detection and an improved efficiency have increased the total counting rate by a factor of 22, thereby reducing random error in the diffraction measurements. The banana-like multidetector gives to 7C2 the possibility of registering a complete diffractogram over the whole angular range in one shot, which is a comparative advantage with respect to other hot-neutrons two-axis diffractometers.
【 预 览 】
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7C2, the new neutron diffractometer for liquids and disordered materials at LLB | 4650KB | download |