Speaker
Bruno Wittmer
(I. Physikalisches Institut (B) - Rheinisch-Westfaelische Technis)
Description
In the CMS Microstrip Tracker the algorithms that are used for the online
track reconstruction, require the alignment of the tracker modules on a level
of better than 100 μm. A Laser Alignment System has been developed that
is able to detect possible movements or deformations of the Tracker
mechanical structure with this level of precision. This system works with
infrared laser beams which are detected by the silicon microstrip sensors,
allowing to monitor movements of a subset of the tracker modules with
respect to each other. In this presentation an overview of the Laser
Alignment System is given, and first measurements with the integrated
system are presented. The system has been shown to work properly and it
confirms the expected mounting precision of the sensor modules in the
detector endcaps. During one cooling cycle no significant deformation of the
endcap structure was observed.
Author
Bruno Wittmer
(I. Physikalisches Institut (B) - Rheinisch-Westfaelische Technis)
