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This setup allows the use of THz time domain spectroscopy on analogs including refractory materials in the spectral range from 0.1 to 5.5\u00a0THz with a spectral resolution of up to 0.005\u00a0THz. Since the optical setup is mounted on a precision controlled x\/y-stage, imaging or spatial averaging can be performed. In this work, we present the design decisions and selection of components. Furthermore, the commissioning of the setup is described and the capabilities are shown. The system can reach pressures of 10\u22127 mbar and temperatures of 50\u00a0K. 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