eprintid: 10168654
rev_number: 7
eprint_status: archive
userid: 699
dir: disk0/10/16/86/54
datestamp: 2023-04-21 12:44:51
lastmod: 2023-04-21 12:44:51
status_changed: 2023-04-21 12:44:51
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Cunningham, MH
creators_name: Doel, P
creators_name: Brooks, D
creators_name: Brynnel, J
creators_name: De Jong, RS
creators_name: Frey, S
creators_name: Schroeck, M
creators_name: Gaebler, M
creators_name: Sablowski, D
creators_name: Barden, SC
title: Assembly and alignment of the 4-metre multi-object spectroscopic telescope wide field corrector
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F60
keywords: wide-field multi-object spectrograph facility; visible and infrared survey telescope
for astronomy; wide field corrector; 4-metre multi-object spectroscopic telescope
note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: The 4-metre multi-object spectroscopic telescope (4MOST) is a fiber-fed multi-object spectrograph for the VISTA telescope at the European Southern Observatory (ESO) Paranal Observatory in Chile. The goal of the 4MOST project is to create a general purpose and highly efficient spectroscopic survey facility for astronomers in the 4MOST consortium and the ESO community. The instrument itself will record 2436 simultaneous spectra over a 1/44.2 square deg field of view and consists of an optical wide-field corrector (WFC), a fiber positioner system based on a tilting spine design, and three spectrographs giving both high and low spectral dispersion. The WFC comprises of six lenses grouped into four elements, two of which are cemented doublets that act as an atmospheric dispersion corrector. The first lens element is 0.9 m in diameter while the diameter of the other elements is 0.65 m. For the instrument to meet its science goals, each lens was aligned to be well within 1/4100 μm - a major challenge. This was achieved using contact metrology methods supplemented by pencil beam laser probes. In particular, an off-axis laser beam system has been implemented to test the optics' alignment before and after shipment. This work details the alignment and assembly methods and presents the latest results on the achieved lens positioning and projected performance of the WFC.
date: 2023-02-14
date_type: published
publisher: SPIE-Intl Soc Optical Eng
official_url: https://doi.org/10.1117/1.JATIS.9.1.015002
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2016946
doi: 10.1117/1.JATIS.9.1.015002
lyricists_name: Doel, Andrew
lyricists_name: Brooks, David
lyricists_id: APDOE12
lyricists_id: DBROO45
actors_name: Flynn, Bernadette
actors_id: BFFLY94
actors_role: owner
full_text_status: public
publication: Journal of Astronomical Telescopes, Instruments, and Systems
volume: 9
number: 1
article_number: 15002
issn: 2329-4124
citation:        Cunningham, MH;    Doel, P;    Brooks, D;    Brynnel, J;    De Jong, RS;    Frey, S;    Schroeck, M;             ... Barden, SC; + view all <#>        Cunningham, MH;  Doel, P;  Brooks, D;  Brynnel, J;  De Jong, RS;  Frey, S;  Schroeck, M;  Gaebler, M;  Sablowski, D;  Barden, SC;   - view fewer <#>    (2023)    Assembly and alignment of the 4-metre multi-object spectroscopic telescope wide field corrector.                   Journal of Astronomical Telescopes, Instruments, and Systems , 9  (1)    , Article 15002.  10.1117/1.JATIS.9.1.015002 <https://doi.org/10.1117/1.JATIS.9.1.015002>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10168654/1/015002_1.pdf