Improved Modelling of the Thermo-Mechanical behavior of the CLIC Two Beam Module

Micron-level stability of the Compact LInear Collider(CLIC) two-beam modules, two-meter repetitive units constituting the main linacs, is one of the most important requirements to achieve the final luminosity target. High power dissipation during normal operation modes of modules will result in misalignments in and between different elements of the linacs, thus affecting the final resulting luminosity. In this paper, updated finite element models of CLIC two-beam modules are presented and the structural behaviour of them is studied in more detail than in the earlier simulations. In particular, the models have been refined by improving the modelling of actuators and bellows as well as studying the most updated versions of CLIC modules. Based on the main operation modes of the CLIC collider, the results of thermal and structural analysis of two-beam modules are presented. These numerical results will be validated by experimental tests to be performed in 2012 with full-scale CLIC prototype modules. They will allow for better understanding the thermo-mechanical behaviour and they will be propagated back to numerical modelling