33 research outputs found
ELT instrumentation for seeing-limited and AO-corrected observations: A comparison
The next generation of large ground-based optical and infrared telescopes
will provide new challenges for designers of astronomical instrumentation. The
varied science cases for these extremely large telescopes (ELTs) require a
large range of angular resolutions, from near diffraction-limited performance
via correction of atmospheric turbulence using adaptive optics (AO), to
seeing-limited observations. Moreover, the scientific output of the telescopes
must also be optimized with the consideration that, with current technology, AO
is relatively ineffective at visible wavelengths, and that atmospheric
conditions will often preclude high-performance AO. This paper explores some of
the issues that arise when designing ELT instrumentation that operates across a
range of angular resolutions and wavelengths. We show that instruments designed
for seeing-limited or seeing-enhanced observations have particular challenges
in terms of size and mass, while diffraction-limited instruments are not as
straightforward as might be imagined.Comment: 8 pages, to appear in the SPIE proceedings "ELTs: Which
Wavelengths?", from the Lund Symposium on occasion of Arne Ardeberg's
retiremen
MAORY AO performances
The Multi-conjugate Adaptive Optics RelaY (MAORY) should provide 30% SR in K
band (50% goal) on half of the sky at the South Galactic Pole. Assessing its
performance and the sensitivity to parameter variations during the design phase
is a fundamental step for the engineering of such a complex system. This step,
centered on numerical simulations, is the connection between the performance
requirements and the Adaptive Optics system configuration. In this work we
present MAORY configuration and performance and we justify theAdaptive Optics
system design choices.Comment: 9 pages, 7 figures, 1 table. SPIE conference Astronomical Telescopes
and Instrumentation, 14 - 18 December 2020, digital foru
Status of the PSF Reconstruction Work Package for MICADO ELT
MICADO is a workhorse instrument for the ESO ELT, allowing first light
capability for diffraction limited imaging and long-slit spectroscopy at
near-infrared wavelengths. The PSF Reconstruction (PSF-R) Team of MICADO is
currently implementing, for the first time within all ESO telescopes, a
software service devoted to the blind reconstruction of the PSF. This tool will
work independently of the science data, using adaptive optics telemetry data,
both for Single Conjugate (SCAO) and Multi-Conjugate Adaptive Optics (MCAO)
allowed by the MORFEO module. The PSF-R service will support the
state-of-the-art post-processing scientific analysis of the MICADO imaging and
spectroscopic data. We provide here an update of the status of the PSF-R
service tool of MICADO, after successfully fulfilling the Final Design Review
phase, and discuss recent results obtained on simulated and real data gathered
on instruments similar to MICADO.Comment: to appear in the Proceedings 12185-149 of the SPIE conference
Adaptive Optics Systems VIII, Astronomical Telescopes+Instrumentation 2022
Montreal, Quebec, Canada; 6 pages, 1 figure, 1 table; updated affiliation
MAORY for ELT: preliminary design overview
MAORY is one of the approved instruments for the European Extremely Large Telescope. It is an adaptive optics module, enabling high-angular resolution observations in the near infrared by real-time compensation of the wavefront distortions due to atmospheric turbulence and other disturbances such as wind action on the telescope. An overview of the instrument design is given in this paper
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Simulations of AO for the E-ELT and its instruments
We present an overview of the latest simulation results obtained for the European Extremely Large Telescope's different Adaptive Optics systems. Different areas of the telescope and instruments are covered. Simulations showing how a single conjugated AO system can be used to detect a scalloping error is shown. We show that when the scalloping error modes are entered in the reconstruction modal basis, the DM shape can be used to estimate the scalloping error through a simple matrix vector multiply. Temporal averaging allows to get rid of the atmospheric noise on the scalloping measurement assuming a perfect “scalloping actuator” and to get a measurement accuracy of ~20nm rms. In a second part, we focus on a few results obtained on tomographic AO systems, like for example the sensitivity to the number of Deformable Mirrors and their pitch in multi-conjugate AO, and the impact of the outer scale of turbulence on Laser tomography AO