VLTI-UT vibrations effort and performances

Poupar, Sébastien; Haguenauer, Pierre; Alonso, Jaime; Schuhler, Nicolas; Henriquez, J. P.; Berger, J.‐P.; Bourget, P.; Brillant, S.; Castillo, R.; Gitton, Philippe B.; Gonté, Frederic; Lieto, Nicola Di; Lizon, Jean-Louis; Mérand, A.; Woillez, J.

doi:10.1117/12.2055435

Cited by 3 publications

(4 citation statements)

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“…As reported two years ago by both VLTI [20] and SPHERE [21] , the field stabilization control loop, which runs between the guide probe and the UT secondary mirror, was responsible for significant degradation of the wavefront delivered to high angular resolution instruments. The guide probe would send tip/tilt guiding offsets that would be instantly corrected by the high control bandwidth secondary mirror.…”

Section: The Impact Of the Telescope Secondary Mirrormentioning

confidence: 95%

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The 2nd generation VLTI path to performance

et al. 2016

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The upgrade of the VLTI infrastructure for the 2 nd generation instruments is now complete with the transformation of the laboratory, and installation of star separators on both the 1.8-m Auxiliary Telescopes (ATs) and the 8-m Unit Telescopes (UTs). The Gravity fringe tracker has had a full semester of commissioning on the ATs, and a first look at the UTs. The CIAO infrared wavefront sensor is about to demonstrate its performance relative to the visible wavefront sensor MACAO. First astrometric measurements on the ATs and astrometric qualification of the UTs are on-going. Now is a good time to revisit the performance roadmap for VLTI that was initiated in 2014, which aimed at coherently driving the developments of the interferometer, and especially its performance, in support to the new generation of instruments: Gravity and MATISSE.

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Section: The Impact Of the Telescope Secondary Mirrormentioning

confidence: 95%

“…Known to suffer more from vibrations, the UTs have been the focus of intense vibration mitigation efforts over the years [19], [20] . These efforts have continued over the past two years, motivated by the arrival of the Gravity instrument, and its challenging Galactic Center science case.…”

Section: Unit Array Performancementioning

confidence: 99%

The 2nd generation VLTI path to performance

et al. 2016

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“…The VLT and VLTI experiences with years of effort to understand and deal with vibrations 22,23 shaped the thinking and the approach to tackle the problem for ESO's ELT. The "mitigation" philosophy here differs from approaches where the effort is mainly put on finding ways to reduce the effects after already observing the "damage."…”

Section: Eso's Eltmentioning

confidence: 99%

Management of equipment vibration for extremely large telescopes

Adams

Fordham

Jakob

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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Management of equipment vibration will be a challenge for the upcoming generation of extremely large telescopes (ELTs) (GMT, TMT, and ESO's ELT) and is being dealt with proactively by all three projects. We document the approaches, techniques, and future efforts by all three ELTs in their attempts to manage vibration in their telescopes. We detail the approaches to developing component requirements, characterizing vibration sources, simulating telescope structural movements, and approaches to mitigating source vibrations. We illustrate the iterative approach taken by the three observatories with several examples of concrete processes, measurements, and other details of use to future observatories.

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“…Though still not optimum, this improves a lot the fringe's contrast at the interferometric focus. Recently, even more progresses have been made in the understanding of the UT vibrations phenomena, in particular thanks to a few night of VLTI-UT observations done with all UT instruments turned off 9 . These understandings have yet to lead to substantial decrease of the OPD jitter.…”

Section: Ut Vibrationsmentioning

confidence: 99%

VLTI status update: a decade of operations and beyond

Mérand¹,

Abuter²,

Aller-Carpentier³

et al. 2014

SPIE Proceedings

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We present the latest update of the European Southern Observatory's Very Large Telescope interferometer (VLTI). The operations of VLTI have greatly improved in the past years: reduction of the execution time; better offering of telescopes configurations; improvements on AMBER limiting magnitudes; study of polarization effects and control for single mode fibres; fringe tracking real time data, etc. We present some of these improvements and also quantify the operational improvements using a performance metric. We take the opportunity of the first decade of operations to reflect on the VLTI community which is analyzed quantitatively and qualitatively. Finally, we present briefly the preparatory work for the arrival of the second generation instruments GRAVITY and MATISSE.Comment: 10 pages, 7 figures, Proceedings of the SPIE, 9146-1

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VLTI-UT vibrations effort and performances

Cited by 3 publications

References 0 publications

The 2nd generation VLTI path to performance

The 2nd generation VLTI path to performance

Management of equipment vibration for extremely large telescopes

VLTI status update: a decade of operations and beyond

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