Monitoring of the Assembly of the BOS 98 Prototype MDT Chamber

A detailed description of the monitoring procedures and results during the construction of the BOS 98 prototype MDT chamber is given. The analysis of the optical monitoring data taken during the construction of the BOS 98 prototype chamber shows the importance of this information for the control of the assembly process. The data have been used to optimize the assembly procedure. The influence of the thermal environment in the assembly room on the chamber and on the optical monitors (laser beams) has been studied and understood in detail. The results of the analysis give confidence in the capability of the assembly method to achieve the required mechanical accuracy of the chambers in series production.