10th International Workshop on Accelerator alignment, KEK,Tsukuba-february 2008

Survey and Alignment Concept for Installation of the SPIRAL2 Accelerator Devices at GANIL

This paper has focused mainly on the survey and alignment techniques selected for installation of the SPIRAL 2 accelerator devices. In such a project, the alignment aspects have to be studied very early. To determine the best technique for aligning any equipment, it is essential to know the precision required for the six degrees of freedom, and to understand the reasons for the requested precision. An object is “located” by its fiducial marks. The high quality of the mechanical connection to these marks is important in the final precision of the object location. The paper will also present instrumentations which will be used for alignment.

The Alignment Strategy for the SPIRAL2 Superconducting Linac Cryomodules

This poster covers exclusively the alignment strategy which will be used for the positioning and alignment of the LINAC superconducting cryomodules. Two types of superconducting cavities were are now under construction, quarter-wave resonators (QWR) and half-wave resonators (HWR). The solution adopted to support the LINAC components, is a welded-frame structure equipped with guide rails. One advantage of this solution is the possibility of bringing a component into a laboratory together with its support, for example, in order to do a realignment of the cavities in the cryostat then to put it back on the beam line under the same conditions, using the guide rails. During the process of assembly, the interior of the superconducting linear accelerator cavities cannot be accessed outside a clean room. As a result, the cavity will have to be equipped with optical targets mounted on an arm in order to facilitate its alignment inside the cryostat. For the final phase, a special target boxes (fiducials) will be adjusted to the sides of cryomodules supports to ensure their alignment on the guide rails. Alignment will be controlled at each stage of the assembly process.