Abstract
A neutron reflectometer is installed at Tsing-Hua Open Pool Reactor (THOR) W3 beam port in NTHU (National Tsing Hua University). This is the first neutron scattering beamline at THOR for 40 years operation. The neutron reflectometer can be used to measure the atomic and magnetic depth profiles of the polymer and magnetic thin films. Neutron mainly interacts with the nuclei and magnetic moments; and X-ray interacts with electron clouds, respectively. They are important and complementary tools on the research work of condensed matter physics. The non-polarized neutron reflectometer is finished constructed, and the polarized one is in process currently. For the polarized neutron reflectometer, a Heusler crystal will be used to monochromate and polarize neutron; Or to polarize the neutron by using Fe/Si supermirror after monochromated by the graphite crystal. The preliminary results show that the maximum counting rate is 10^5 cps at the sample stage, the background is 0.2 cps, and the maximum dynamic range can be achieved up to 10^4–10^5.