[en] ○ Development of high power THz FEL based on compact accelerator - Compact microtron accelerator - Beam optics and radiation shielding system - Helical undulator - Low-loss cylindrical waveguide in THz range ○ Development of high-speed THz-imaging technology - Design of high-speed imaging system with high-power THz wave - Research on the spectroscopic imaging method - Design of remote irradiation system - Advancement of THz imaging technology ○ Development of table-top high-speed THz image inspection system technology - Compact, high-speed, image inspection system - Study on the system compactization and spectroscopic imaging technology with multi-foil THz generation technology.