This paper describes a preliminary engineering design for the European Extremely Large Telescope (E-ELT) enclosure.
The sheer size of the E-ELT enclosure has provoked an engineering led design approach to re-assess and resolve some
conventional telescope enclosure design issues. By drawing on other large scale movable structure design experience, the
proposed engineering solution fulfils the design requirements both technically and economically. Throughout the study
the design approach has attempted to minimise development risks and maximise reliability of the movable systems
wherever possible.
All the key elements of the enclosure design are discussed. Emphasis is, however, placed on describing the unusual
aspects of the design, which include: a unique system of nested panels for opening the viewing slot; and a curved gantry
crane giving extensive coverage of the telescope and enclosure. The paper also proposes a possible construction method,
and addresses the specific requirements associated with fabricating and maintaining a large movable structure located at
high altitude.
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