Installation of the soft X-ray multi-camera tomography system (XMCTS) in the Wendelstein 7-X stellarator

•Assembly procedure of twenty pinhole camera X-ray tomography system.•Welding of in-vessel pipe systems for cooling water, compressed air and signals.•Tests and installation of the Bourdon spring shutter systems.•Integration and assembly of the preamplifier electronics and signal cables.•Measurements of amplitude and phase responses of X-ray silicon diode arrays. The soft X-ray multi-camera tomography system (XMCTS) is currently under preparation for commissioning and first operation in the next experimental campaign of the Wendelstein 7-X stellarator. The diagnostic consists of a set of 20 X-ray cameras installed inside the plasma vessel. For design, engineering and manufacturing of the mechanic and electronic components extensive requirements had to be met, which are specific for operation in a long pulse plasma device. This includes for instance compatibility with high levels of microwave stray radiation, the need for active cooling and the handling of sputtering of wall material. This paper describes the final preassembly and provides a summary of major technical issues. The key work packages are the welding of the pipe systems (water cooling, compressed air, signal) and the integration of the electronic components including signal and supply cables.