Speaker
Dr
Helene Mainaud Durand
(CERN)
Description
The pre-alignmnet of CLIC consists in aligning the components of linacs and beam delivery systems (BDS) in the most accurate way possible, so that a first pilot beam can circulate and allow the implementation of the beam based alignment. Taking into account the precision and accuracy needed: 10 microns rms over sliding windows of 200m, this pre-alignment must be active and it can be divided into two parts:
- the determination of a straight reference over 20 km, thanks to a metrological network
- the determination of the components positions with respect to this reference and their adjustment.
The second part is the object of the paper, describing the steps of the proposed strategy: firstly the fiducialisation of the different components of CLIC; secondly, the alignment of these components on common supports and thirdly the active alignment of these supports using sensors and actuators. These steps have been validated on a test setup over a length of 4m, and the obtained results are analyzed.
Primary author
Dr
Helene Mainaud Durand
(CERN)