Neutron Imaging Development at China Academy of Engineering Physics (CAEP)

Effect of the Heterogeneity on Sorptivity in Sandstones with High and Low Permeability in Water Imbibition Process

“…The imbibition of water imbibition in specimens W1 and S1 were imaged using the cold neutron radiography facility (CNRF), which was installed at the end of the neutron catheter hall C1 catheter in the China Mianyang Research Reactor (CMRR). The CMRR is an advanced pool-type research reactor that has 20 MW of power, six horizontal tubes, 21 vertical tubes, and a D-T accelerator neutron source, established by the Institute of Nuclear Physics and Chemistry (INPC) of the China Academy of Engineering Physics (CAEP) [34]. The most probable neutron wavelength and the maximum neutron flux is 2.7 Å and 8.0 × 10 6 n/cm 2 /s for CNRF at an imaging position with L/D = 400 (L is the collimator tube length; D is the aperture diameter).…”

“…Figure 3 illustrates the schematic of the neutron imaging facility. More detailed information of the neutron imaging facility has been reported in Hang et al [34]. The experimental process was described as follows: (i) obtain…”

“…Figure 3 illustrates the schematic of the neutron imaging facility. More detailed information of the neutron imaging facility has been reported in Hang et al [34]. The experimental process was described as follows: (i) obtain one dark-current image (shutter closed, no neutron illumination), which is denoted as I (DF) , and one flat-field image (open shutter, without specimen), which is denoted as I (OB) [35]; (ii) fix specimen W1 or S1 on the specimen holder respectively (see Figure 3), the distance of the specimen was 10 mm away from the scintillator screen; (iii) take one image of the dried specimen, denoted as I (Dry) ; and (iv) keep the shutter open and slowly lift the container until the bottom of specimen was in contact with the water surface-this moment is defined as the baseline (zero) time [12].…”

“…Figure 3. Schematic of experimental arrangement for monitoring water imbibition by neutron radiography: (1) Neutron source; (2) Collimator; (3) Neutron beam; (4) Specimen holder; (5) Specimen; (6) Aluminum container; (7) Lifting platform; and (8) Imaging system[34].…”

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

“…Nowadays, eight spectrometers have been completed and come into service in the CMRR-based neutron center. 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.…”