A New Operating Neutron Scattering Facility CMRR in China

摘要

The China Mianyang Research Reactor (CMRR) with the power of 20 MW is located in Mianyang City, Sichuan Province. It is a multifunctional pool research reactor and has a liquid hydrogen cold neutron source, which began to work from September 2013. The thermal and cold fl uxes for neutron scattering experiments are measured to be 2.4 × 10~(14) n·cm~(-2)·s~(-1) and 109 n·cm~(-2)·s~(-1), respectively. CMRR is devoted to both fundamental and applied research. In the fi rst phase, eight neuron scattering instruments have been installed and started operation from the middle of 2014, as shown in Figure 1. Four thermal neutron instruments have been installed in the reactor hall, which are a high resolution neutron diffractometer (HRND), a residual stress neutron diffractometer (RSND), a thermal neutron radiography station (TNR) and a high pressure neutron diffractometer (HPND), respectively. Four cold neutron instruments have been installed in the neutron guide hall (i.e., the cold neutron scattering hall), which are a small-angle neutron spectrometer (SANS), a time-of-fl ight and polarized neutron refl ectometer (TPNR), a cold neutron triple-axis spectrometer (CTAS) and a cold neutron radiography station (CNR), respectively.