A proposal for the mechanical design of the LumiCal detector

The LumiCal calorimeter will be located in very forward region of the future detector at the International Linear Collider (ILC). It is compose of tungsten plates and thirty silicon detector planes. It will be used for precisely luminosity measurement. The requirement for the position stability of the silicon detectors is very high. The actual position of each silicon detector plane relative to each other and of the calorimeter relative to the beam line and the interaction point should be known with accuracy of a few micrometers. To achieve this goal the structure of the calorimeter has to be very stiff. Moreover, the support and the temperature of the calorimeter have to be stable. The aim of this paper is to describe the mechanical structure of the detector which can fulfill the requirement of the structure stiffness. For the proposed structure appropriate calculations of deformations under the dead load have been carried out. From presented here results of calculations it is concluded that the proposed structure can be accepted from the stiffness point of view. (author)