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Extremely Large Telescope Prefocal Station A system concept
Author(s): S. A. E. Lewis; E. Brunetto; A. Förster; C. Frank; I. Guidolin; S. Guisard; P. Hammersley; R. Holzlöhner; P. Jolley; J. Kosmalski; U. Lampater; E. Marchetti; P. La Penna; T. Pfrommer; P. Zuluaga
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Paper Abstract

The Prefocal Station (PFS) is the last opto-mechanical unit before the telescope focal plane in the Extremely Large Telescope (ELT) optical train. The PFS distributes the telescope optical beam to the Nasmyth and Coudé instrument focal stations and it contains all of the sky metrology (imaging and wavefront sensing) that will be used by the active optics of the telescope and to support operations such as phasing the primary mirror (phasing and diagnostic station). It also hosts local metrology that will be used for coarse alignment and maintenance. We present the main results of a concept design study for the Nasmyth A prefocal station.

Paper Details

Date Published: 9 July 2018
PDF: 19 pages
Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 107001B (9 July 2018); doi: 10.1117/12.2313535
Show Author Affiliations
S. A. E. Lewis, European Southern Observatory (Germany)
E. Brunetto, European Southern Observatory (Germany)
A. Förster, European Southern Observatory (Germany)
C. Frank, European Southern Observatory (Germany)
I. Guidolin, European Southern Observatory (Germany)
S. Guisard, European Southern Observatory (Germany)
P. Hammersley, European Southern Observatory (Germany)
R. Holzlöhner, European Southern Observatory (Germany)
P. Jolley, European Southern Observatory (Germany)
J. Kosmalski, European Southern Observatory (Germany)
U. Lampater, European Southern Observatory (Germany)
E. Marchetti, European Southern Observatory (Germany)
P. La Penna, European Southern Observatory (Germany)
T. Pfrommer, European Southern Observatory (Germany)
P. Zuluaga , European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 10700:
Ground-based and Airborne Telescopes VII
Heather K. Marshall; Jason Spyromilio; Roberto Gilmozzi, Editor(s)

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