For the ELT, a total of 931 M1 Segment Assemblies will be manufactured. These will be of 133 different types, 7 copies each, with different optical and mechanical properties. The manufacturing of the segment support, the glass blank and the polishing will be done by industrial partners. ESO will be responsible for the shipment of the Segment Assemblies to Chile, for the integration of the edge sensors and their electronics, and for the cleaning and coating. After performing several health- and quality-checks, the Segment Assemblies will be temporarily stored in the warehouse, before being installed at the telescope and eventually recoated around every 2 years. The telescopes and instruments for optical astronomy are usually prototypes, while a new approach is required to manage such a series production of crucial components, which differ in small but significant aspects. In this paper, we will present the processes we have developed to manage the series production of M1 Segment Assemblies for the ELT, starting from the reception of the Segment Assemblies in Chile, inspection, installation of sub-components, health-checks, storage, and installation at the telescope.
The construction of the ELT is now in full swing. This is true both for the construction of the Dome and Main Structure (DMS) in Chile, but also for all the other sub-systems manufactured by industrial partners in Europe. While the DMS is entirely managed by the industrial consortium, the shipment to Chile and the installation at the telescope of the other subsystems is mostly under the responsibility of ESO. The shipment of these components from Europe to Chile has started recently and will soon reach a level of ~10'000 components/month. All these components will need to be tracked during their shipment, incoming inspections will need to be performed, health-checks and integration with other components will need to be done. The components will then be stored temporarily at the warehouse, before being installed at the telescope. We will present the approach for the logistics, infrastructure, and the tools set up to manage the status and location of all these components and to keep the link to their associated latest documentation.
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