MEASUREMENTS OF THE LiCAS SYSTEM

The Linear Collider requires precision survey and alignment during construction and operation. The TESLA collider is one proposed design with a vertical alignment tolerance of 200μm over 600m and a horizontal alignment tolerance of 500μm over 600m [1]. This demanding tolerance cannot be achieved with conventional surveying techniques which are limited by the refraction of light in air. The Linear Collider Alignment and Survey (LiCAS) group in collaboration with the DESY applied geodesy group have been developing a Rapid Tunnel Reference Surveyor (RTRS) to overcome the limitations of conventional surveying techniques [2]. The LiCAS group has been developing novel optical metrology techniques. The status of the laboratory test systems is discussed in this paper. There is an additional paper describing the simulation and performance of the LiCAS system inside the RTRS [3].