Extremely Large Telescope Prefocal Station A system concept

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

doi:10.1117/12.2313535

9 July 2018 Extremely Large Telescope Prefocal Station A system concept

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

Author Affiliations +

Proceedings Volume 10700, Ground-based and Airborne Telescopes VII; 107001B (2018) https://doi.org/10.1117/12.2313535
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

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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, and P. Zuluaga "Extremely Large Telescope Prefocal Station A system concept", Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 107001B (9 July 2018); https://doi.org/10.1117/12.2313535

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