VLTI Unit Telescope coudé train vibration control upgrade for GRAVITY+
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arXiv
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| Format: | Preprint |
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2024
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| author | Laugier, Romain Woillez, Julien Defrère, Denis Courtney-Barrer, Benjamin Salman, Muhammad Sedghi, Babak Abuter, Roberto Bigioli, Azzurra Fabricius, Maximilian Eisenhauer, Frank Gonté, Frédéric Schuhler, Nicolas Lutz, Dieter Riquelme, Miguel Bourget, Pierre Neuville, Philippe Lacour, Sylvestre Nowak, Mathias |
| author_facet | Laugier, Romain Woillez, Julien Defrère, Denis Courtney-Barrer, Benjamin Salman, Muhammad Sedghi, Babak Abuter, Roberto Bigioli, Azzurra Fabricius, Maximilian Eisenhauer, Frank Gonté, Frédéric Schuhler, Nicolas Lutz, Dieter Riquelme, Miguel Bourget, Pierre Neuville, Philippe Lacour, Sylvestre Nowak, Mathias |
| contents | Scaling up interferometry to 8m collectors should smooth-out the optical piston perturbations and allow a slow fringe tracker to obtain high precision correction on faint targets. In practice, the GRAVITY fringe tracker still observes high frequency OPD components that limit the exposure time, its precision and limiting magnitude. Perturbations seem to come from mechanical vibrations in the train of mirrors. As part of the GRAVITY+ efforts, accelerometers were added to all the mirrors of the coudé train to compensate in real-time the optical path using the main delay lines. We show their effectiveness on vibrations peaks between 40 and 200Hz and outline prospects for the upgrade of the deformable mirrors and the beam-compressor differential delay lines. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_17191 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | VLTI Unit Telescope coudé train vibration control upgrade for GRAVITY+ Laugier, Romain Woillez, Julien Defrère, Denis Courtney-Barrer, Benjamin Salman, Muhammad Sedghi, Babak Abuter, Roberto Bigioli, Azzurra Fabricius, Maximilian Eisenhauer, Frank Gonté, Frédéric Schuhler, Nicolas Lutz, Dieter Riquelme, Miguel Bourget, Pierre Neuville, Philippe Lacour, Sylvestre Nowak, Mathias Instrumentation and Methods for Astrophysics Scaling up interferometry to 8m collectors should smooth-out the optical piston perturbations and allow a slow fringe tracker to obtain high precision correction on faint targets. In practice, the GRAVITY fringe tracker still observes high frequency OPD components that limit the exposure time, its precision and limiting magnitude. Perturbations seem to come from mechanical vibrations in the train of mirrors. As part of the GRAVITY+ efforts, accelerometers were added to all the mirrors of the coudé train to compensate in real-time the optical path using the main delay lines. We show their effectiveness on vibrations peaks between 40 and 200Hz and outline prospects for the upgrade of the deformable mirrors and the beam-compressor differential delay lines. |
| title | VLTI Unit Telescope coudé train vibration control upgrade for GRAVITY+ |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2407.17191 |