Integration and early testing of WEAVE: the next-generation spectroscopy facility for the William Herschel Telescope

Dalton, Gavin; Trager, S. C.; Abrams, Don Carlos; Bonifacio, P.; Aguerri, J. A. L.; Vallenari, A.; Bishop, Georgia; Middleton, Kevin; Benn, Chris; Dee, Kevin; Mignot, Shan; Lewis, Ian; Pragt, J.; Picó, Sergio; Walton, N. A.; Rey, Juerg; Prieto, C. Allende; Lhomé, Émilie; Balcells, M.; Terrett, D. L.; Brock, Matthew; Ridings, Andy; Skvarč, J.; Verheijen, Marc; Steele, I. A.; Stuik, Remko; Kroes, Gabby; Tromp, Neils; Kragt, Jan; Lesman, Dirk; Mottram, Chris; Bates, Stuart; Gribbin, Frank; Burgal, José Alonso; Herreros, J. M.; Delgado, José Miguel; Martín, Carlos; Cano, Diego; Navarro, Ramón; Irwin, M. J.; Arriba, L. Peralta de; O'Mahoney, Neil; Bianco, Andrea; Moleinezhad, Alireza; Horst, Rik ter; Molinari, E.; Lodi, M.; Guerra, J.; Baruffalo, Andrea; Carrasco, E.; Farcas, Szigfrid; Schallig, Ellen; Hughes, Sarah; Hill, V.; Smith, Dan; Drew, J. E.; Poggianti, Bianca M.; Iovino, A.; Pieri, Matthew M.; Jin, Shoko; Palmero, Lillian Dominguez; Fariña, C.; Martin, Adrian P.; Worley, C. C.; Murphy, D. N. A.; Guest, Steve; Morris, Huw; Elswijk, Eddy; Haan, Menno de; Hanenburg, Hiddo; Salasnich, Bernardo; Mayya, Y. D.; Izazaga-Pérez, Rafael; Gafton, E.; Caffau, E.; Horville, D.; Chinchón, Francisco Paz; Falcon-Barosso, Jesus; Gänsicke, B. T.; Juán, J. San; Hernández, N.

doi:10.1117/12.2561067

Cited by 16 publications

(8 citation statements)

References 4 publications

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“…Fiber-related activities are coming to an end with efforts now on publishing the as-built documentation and final analysis of all the test data. Concerning the instrument, the interested reader is advised to turn the paper [5] describing the overall status of WEAVE in these proceedings.…”

Section: Discussionmentioning

confidence: 99%

“…The MOS and mIFU buttons and MOS, mIFU and LIFU slitlets were high-precision mechanics because the instrument concept did not offer ways of accommodating all the geometrical defects leading to optical misalignment of the fibers 5 , even in the frame of the optical alignment realized using the gluing bench. They were high precision mechanics needed in large numbers.…”

Section: Mechanicsmentioning

confidence: 99%

“…WEAVE is a project for installing a multi-object wide-band dual-resolution spectrograph on the William Herschel Telescope in La Palma, part of the Canary Islands in the North hemisphere. Initiated early in the years 2010, the project has been making significant progress [1][2][3][4][5] and is now nearing completion with first light envisaged for early 2021. This paper focuses on the fiber optics system and particularly on the 2016-2020 phase during which it was assembled, tested and integrated.…”

Section: Introductionmentioning

confidence: 99%

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Fibre links for the WEAVE instrument: the making of

Mignot

Bonifacio

Fasola

et al. 2020

Modeling, Systems Engineering, and Project Management for Astronomy IX

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The WEAVE instrument nearing completion for the William Herschel Telescope is a fiber-fed spectrograph operating in three different modes. Two comprise deployable fibers at the prime focus for point-like objects and small integral field units (IFU), the third is a large IFU placed at the center of the field. Three distinct fiber systems support these modes and route the photons to the spectrograph located on the Nasmyth platform 33m away: the first features 960+940 fibers and is duplicated to allow configuring the fibers on one plate while observation is carried out on the other, the second has 20 hexagonal IFUs featuring 37 fibers each, the third is a large array of 609 fibers with twice the former's diameter. The large number of fibers and the diversity of their instantiation have made procurement of the parts and assembly of the custom cables a challenge. They involve project partners in France, the UK and the Netherlands and industrial partners in France, Canada, the USA and China to combine know-how and compress the schedule by parallelizing assembly of the cables. Besides the complex management that this induces, it has called for revising the fibers' handling to relax tolerances and for a rigorous assessment of the conformity of the products. This paper tells the story of the making of the fiber links, presents the overall organization of the procurement and assembly chains together with the inspection and testing allowing for assessing the conformance of the hardware delivered.

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Section: Discussionmentioning

confidence: 99%

Section: Mechanicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fibre links for the WEAVE instrument: the making of

Mignot

Bonifacio

Fasola

et al. 2020

Modeling, Systems Engineering, and Project Management for Astronomy IX

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“…We expect a large number of such stars to be observed in the course of wide-field surveys such as WEAVE (Dalton et al 2020) and 4MOST (de Jong et al 2019). The findings of our investigation can be used to select these stars from the wide surveys.…”

Section: Introductionmentioning

confidence: 99%

Young giants of intermediate mass

Lombardo

François

Bonifacio

et al. 2021

A&A

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Context. In the search of a sample of metal-poor bright giants using Strömgren photometry, we serendipitously found a sample of 26 young (ages younger than 1 Gyr) metal-rich giants, some of which have high rotational velocities. Aims. We determined the chemical composition and rotational velocities of these stars in order to compare them with predictions from stellar evolution models. These stars where of spectral type A to B when on the main sequence, and we therefore wished to compare their abundance pattern to that of main-sequence A and B stars. Methods. Stellar masses were derived by comparison of the position of the stars in the colour-magnitude diagram with theoretical evolutionary tracks. These masses, together with Gaia photometry and parallaxes, were used to derive the stellar parameters. We used spectrum synthesis and model atmospheres to determine chemical abundances for 16 elements (C,

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confidence: 99%

Final assembly, metrology, and testing of the WEAVE fibre positioner

Hughes

Schallig

Lewis

et al. 2020

Ground-Based and Airborne Instrumentation for Astronomy VIII

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WEAVE is the new wide-field spectroscopy facility 1,2,3 for the prime focus of the William Herschel Telescope at La Palma, Spain. Its fibre positioner is essential for the accurate placement of the spectrograph's 960 fibre multiplex. We provide an overview of the final assembly and metrology of the fibre positioner, and results of lab commissioning of its robot gantries. A completely new z -gantry for each positioner robot was acquired, with measurements showing a marked improvement in positioning repeatability. We also present the first results of the configuration software testing, and discuss the metrology procedures that must be repeated after the positioner's arrival at the observatory.

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Integration and early testing of WEAVE: the next-generation spectroscopy facility for the William Herschel Telescope

Cited by 16 publications

References 4 publications

Fibre links for the WEAVE instrument: the making of

Fibre links for the WEAVE instrument: the making of

Young giants of intermediate mass

Final assembly, metrology, and testing of the WEAVE fibre positioner

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