Final assembly, metrology, and testing of the WEAVE fibre positioner
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
TL;DR
This paper details the final assembly, precise metrology, and initial testing of the WEAVE fibre positioner, a critical component for accurate fibre placement in a new wide-field spectroscopic instrument at the William Herschel Telescope.
Contribution
It introduces a new z-gantry design, improved metrology procedures, and initial lab commissioning results for the WEAVE fibre positioner system.
Findings
Enhanced positioning repeatability with new z-gantry
Successful lab commissioning of robot gantries
Initial software testing results show readiness
Abstract
WEAVE is the new wide-field spectroscopy facility 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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