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In all configurations, the diffraction grating will lose a greater fraction of scientific light than any other single optic in the instrument. Additionally, manufacturers are often unable to measure the fraction of transmitted light at HARMONI's longest wavelengths. For these reasons, we have developed a setup to measure the efficiencies of transmission diffraction gratings across HARMONI's bandpass. The setup uses modulated signals, a single detector, and a lock-in amplifier to minimize sources of systematic errors. A modified version of this setup may be used to measure stray light. These setups and initial results are presented.
Once the system architecture has been developed it can be partitioned into a hierarchical product breakdown structure consisting of sub-systems, modules, assemblies, sub-assemblies, and components. Thereafter the product breakdowns structure can be partitioned into a logical work breakdown structure. By using the knowledge and understanding of the development workflows for each of the engineering disciplines required, a single product and work breakdown structure can be used to develop a robust project schedule. In addition, we will show how the processes of configuration management (CMII) are used to integrate the work elements of the various engineering disciplines into a coherent project plan to finalise the designs of parts, modules, assemblies, sub-systems or systems to a level where these parts can either be made or procured for further assembly and integration. Using project planning software such as Microsoft Project, the general shape and critical path of the project can be determined.
Typically, the development of ground based and space astronomical facilities are stretched over many years, even decades. Therefore it is easy to waste a lot of time during the early development phases of the project on nugatory and non-essential tasks. We have adopted the Agile software development methodology to prepare, execute and monitor short term plans (sprints) to ensure progress is being made and that all work elements contributes to the end goal of the project.
We illustrate how these novel techniques have and still are being used in the development of the HARMONI Integral Field Spectrograph. HARMONI was selected as one of the Extremely Large Telescope (ELT) first light instruments. The ELT will be the European Southern Observatory’s (ESO) next generation telescope and observatory and will be built in Chile on Cerra Armazones. The instrument completed its preliminary design phase and the team is now detailing the designs as part of the detailed design phase of the project.
A major objective of this paper is also to show that one single structure, namely the product breakdown structure, is all that is required to plan the development, construction, verification and validation, installation and commissioning of any scientific product. By associating the engineering artefacts required to either procure or build each of the components a robust project time-line can be develop by creating integrated work flows covering all the tasks required to progress the system from conception to a working instrument on sky.
In this context of efficiency and quality improvement of operations within the SciOps department, we had identified a strong need to optimize the management of daily operation tasks, via the development of a daily activity monitoring integrated tool, so this paper details the findings of the Daily Activity Monitoring Integrated Tool (DAMIT), the proof of Concept phase and the first delivered phase. The technical proof of concept was the first phase in development of a daily operation-monitoring tool for the science operations department. The primary objective of this phase was to evaluate the viability and impact of such a tool to improve the quality and efficiency of SciOps at Paranal.
This tool is running after overcoming the first phase of development, after followed an on-site technical analysis of the SciOps daily operation (day and night), the current procedures to certify the completeness and quality of the daily operations, and requirements for this new daily operation monitoring tool.
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