The HANARO neutron reflectometer with horizontal sample geometry

Recently, due to increased interest of Biotechnology (BT) and Nanotechnology (NT), measurement techniques for the interface characterization of the thin film structure and depth profiling are known to be extremely important. In fact, nanosize measurement and characterization techniques are mainly targeting development of the instruments for measurement method of nano structured materials, atomic/molecular structures and magnetic/chemical/physical characterization. Reflectivity measurement, which is located in center of these divisions, is a powerful technique for the study on surfaces and interfaces of materials due to its high spatial resolution perpendicular to the surface. Most of the reflectometers now in Korea have a vertical-sample geometry, and, as a result, are suitable only for solid samples. Hence, a reflectometer with a horizontal-sample geometry is currently in great demand for various frontier researches in Korea. Thus, if a neutron liquid spectrometer is constructed in HANARO then will it be a popular instrument for liquid samples. In this paper, preliminary conceptual designs for the new reflectometer with a horizontal sample geometry at the ST3 thermal port of HANARO (REF-H), and a MCSTAS simulation for the cold source-based reflectometer (BIO-REF) are addressed. The most important concern is the reinstallation of the machine, which was originally designed for the HFBR and utilized for several years, and to adapt its functions to maximize its capabilities under the specific environment of HANARO