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HARMONI Science Path Optics: predicting and analysing the expected as-built performance with and end-to-end optical model

SPIE, the international society for optics and photonics (2020) 370

Authors:

Matthias Tecza, Álvaro Menduiña-Fernández, David M Henry, Hermine Schnetler, Fraser Clarke, Patrick Smith, Miguel A Cagigas García, Alexandre Jeanneau, John I Capone
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Integration and early testing of WEAVE: the next-generation spectroscopy facility for the William Herschel Telescope

Proceedings of SPIE Society of Photo-optical Instrumentation Engineers 11447:2020 (2020) 1144714

Authors:

Gavin Dalton, Scott Trager, Don Carlos Abrams, Ian Lewis, Shoko Jin, Alireza Molaeinezhad, Ellen Schallig, Sarah Hughes, Matthew Brock, David Terrett

Abstract:

We present an update on the overall integration progress of the WEAVE next-generation spectroscopy facility for the William Herschel Telescope (WHT), now scheduled for first light in early-2021, with almost all components now arrived at the observatory. We also present a summary of the current planning behind the 5-year initial phase of survey operations, and some detailed end-to-end science simulations that have been implemented to evaluate the final on-sky performance after data processing. WEAVE will provide optical ground-based follow up of ground-based (LOFAR) and space-based (Gaia) surveys. WEAVE is a multi-object and multi-IFU facility utilizing a new 2-degree prime focus field of view at the WHT, with a buffered pick-and-place positioner system hosting 1000 multi-object (MOS) fibres, 20 mini integral field units, or a single large IFU for each observation. The fibres are fed to a single (dual-beam) spectrograph, with total of 16k spectral pixels, located within the WHT GHRIL enclosure on the telescope Nasmyth platform, supporting observations at R~5000 over the full 370-1000nm wavelength range in a single exposure, or a high resolution mode with limited coverage in each arm at R~20000.
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HARMONI: first light spectroscopy for the ELT: simulating the alignment of a three-mirror anastigmat

SPIE, the international society for optics and photonics (2020) 352

Authors:

John I Capone, David Freeman, James Lynn, James Kariuki, Matthias Tecza, Andrea Hidalgo Valadez
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Final assembly, metrology, and testing of the WEAVE fibre positioner

(2020)

Authors:

Sarah Hughes, Ellen Schallig, Ian J Lewis, Gavin Dalton, David Terrett, Don Carlos Abrams, J Alfonso L Aguerri, Georgia Bishop, Piercarlo Bonifacio, Matthew Brock, Esperanza Carrasco, Kevin Middleton, Scott C Trager, Antonella Vallenari
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HARMONI - first light spectroscopy for the ELT: spectrograph camera lens mounts

(2020)

Abstract:

HARMONI is the first light visible and near-infrared (NIR) integral field spectrograph for the Extremely Large Telescope(ELT). The HARMONI spectrograph will have four near-infrared cameras and two visible, both with seven lenses of various materials and diameters ranging from 286 to 152 mm. The lens mounts design has been optimized for each lens material to compensate for thermal stresses and maintain lens alignment at the operational temperature of 130 K. We discuss their design and mounting concept, as well as assembly and verification steps. We show initial results from two prototypes and outline improvements in the mounting procedures to reach tighter lens alignments. To conclude, we present a description of our future work to measure the decentering of the lenses when cooled down and settled.
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