GMS measurement of B1 liner deformation

The GMS system is successfully used to measure gaps between the liner tube and the disc in the B1 hole. GMS was designed for evaluation of minimum tube diameter. In this report measured results are used to evaluate the tube deformation as a function of salt pressure acting on the liner tube from outside. The salt pressure corresponding to the minimum ovality is compared with the pressure derived from the tube compression in the report ECN-I--92-044. A good agreement is found between both results. A significant increase of the minimum ovality in time is observed. This fact suggests that a subtle deformation of the B1 liner tube has built up in the course of time. The validity of this statement is not influenced by the uncertainty in the salt pressure, only by the measurement accuracy. A significant minimum ovality simply means that there is no circular liner tube solution for the measured gap dimensions. (author). 2 refs., 50 figs., 37 tabs