Upgrade of a small-angle neutron scattering spectrometer Suanni of China Mianyang Research Reactor

Abstract

The small-angle neutron scattering spectrometer, SANS-Suanni, of the 20 MW China Mianyang Research Reactor (CMRR), was upgraded recently to improve its performance and anti-risk capability. The major modifications include: (i) installing a new mechanical velocity selector consisting of a rotor with helical slots; (ii) a replacement of the front of the detector tank to decrease the minimum sample-to-detector distance; (iii) installing a laser locator and a set of fixed lenses in collimator chamber. After the modifications, firstly, a higher maximum-q (qmax) can be achieved up to 6.3 nm−1. With the help of rotating the detector tank, qmax can be further increased to 10.5 nm−1. Secondly, a higher neutron flux at sample position up to 1.18 ×107 cm−2s−1 (at neutron wavelength of 0.53 nm) is obtained. Thirdly, a convenient and user-friendly beam center finding operation for environmental devices is available. The actual performance after the modifications is demonstrated with the measurements of standard samples.

Solvated and Deformed Hairy Metal–Organic Polyhedron

“…SANS measurements were conducted in the spectrometer SANS-Suanni of the China Mianyang Research reactor (CMRR). 34 The MOP solutions for SANS measurements are 30 mg/mL THF-d 8 solutions. The obtained twodimensional (2D) SANS data were reduced to 1D absolute intensity profiles in the Igor Pro environment.…”

“…SANS measurements were conducted in the spectrometer SANS-Suanni of the China Mianyang Research reactor (CMRR) . The MOP solutions for SANS measurements are 30 mg/mL THF-d 8 solutions.…”

Cyclic tensile machine with wide speed range for in situ neutron/X-ray scattering study on elastomers

“…1(b). The center of the heating chamber is designed to be 10 mm away from the edge of BSS, considering that the typically chosen diameter of the neutron beam of the SANS-Suanni spectrometer [42][43][44] at China Mianyang Research Reactor 45 (CMRR) is 8 mm. A displacement sensor is used to detect the position of SU2, which can easily indicate possible errors of position after cyclic tension.…”

MyNeutronDAQ: A general program for data acquisition of neutron scattering spectrometers at China Mianyang Research Reactor and on‐line data‐analysis

“…1 High resolution neutron diffractometer (HRND) Xuanwu, 2 residual stress neutron diffractometer (RSND) Qilin, 3 thermal neutron radiography station (TNR), 4 and high-pressure neutron diffractometer (HPND) Fenghuang, 5 are installed in the reactor hall. Small-angle neutron scattering (SANS) Suanni, [6][7][8] time-of-flight and polarized neutron reflectometer (TPNR) Diting, 9 cold neutron triple-axis spectrometer (CTAS) Kunpeng, 10 and cold neutron radiography facility (CNRF) 11 are installed in the cold neutron scattering hall. Moreover, some spectrometers are under construction, such as ultra-small-angle neutron scattering (USANS), spin echo spectrometers, 12 thermal neutron triple-axis spectrometer, polarized SANS (PSANS), and so on.…”