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MULTI-OBJECT adaptive optics FOR GIRMOS: FINAL DESIGN, RISKS MITIGATION, AND SCIENCE PERFORMANCE 9

MULTI-OBJECT ADAPTIVE OPTICS FOR GIRMOS: FINAL DESIGN, RISKS...

引用

Conference on adaptive optics Systems IX

作者： Conod, U. Jackson, K. Lardiere, O. Anthony, A. Ke, J. Lamb, M. Chapman, S. Sivanandam, S. Christie, S. Sivo, G. Veran, J-P Univ British Columbia Dept Phys & Astron 6224 Agr Rd Vancouver BC Canada NRC Herzberg Astron & Astrophys 5711 West Saanich Rd Victoria BC Canada Dunlap Observ 50 St George St Toronto ON Canada Gemini Observ AURA Colina El Pino S-NCasilla 603 La Serena Chile

ISBN: (纸本)9781510675186;9781510675179

We are presenting in this work, the final design of the Multi-Object adaptive optics system for the Gemini InfraRed Multi Object Spectrograph (GIRMOS). This report outlines key modifications made during the critical design phase as we progress towards the manufacturing assembly integration and testing stage. Our adjustments include in particular, the wavefront sensor subassembly through the selection of a new camera and by optimizing the number of sub-apertures and pixels. Additionally, recent advancements in the Gemini North adaptive optics (GNAO) design prompt a reassessment of Ground Layer adaptive optics (GLAO) and tomographic performance, thus influencing both multi-Objects adaptive optics (MOAO) and the GIRMOS imager. The final optical and mechanical design of the MOAO subsystem as well as the revisited performance is discussed. Since the beginning of the project, we have identified some risks associated to the MOAO system and developed mitigation strategies and activities. We report the progress made towards the mitigation of identified risks such as open-loop calibration and control, go-to errors, quasi-static errors, etc. A primary objective driving the development of GIRMOS is the survey of a substantial sample of high-redshift galaxies. Using AO observations of z similar to 2 galaxies, as seen with SINFONI at the Very Large Telescope, and employing image processing techniques with various GIRMOS simulated point spread functions (PSFs), we methodically explore the GIRMOS ability to detect and characterize star-forming clumps within high-redshift galaxies. This analysis provides valuable insights into optimal target selection based on their positioning in the field of view, on the observing conditions (such as seeing, zenith angle, etc.), and the intended scientific objectives.

关键词： adaptive optics Multi-Object adaptive optics open-loop adaptive optics Laser Tomography Gemini Observatory Integral Field Spectroscopy GIRMOS High Redshift Galaxies Star Forming Clumps

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STATUS OF THE GIRMOS MOAO DEMONSTRATOR 8

STATUS OF THE GIRMOS MOAO DEMONSTRATOR

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Conference on adaptive optics Systems VIII Part of SPIE Astronomical Telescopes and Instrumentation Conference

作者： Conod, U. Lardiere, O. Jackson, K. Chapman, S. Turri, P. Lamb, M. Sivanandam, S. Herriot, G. Veran, J. -P. Univ British Columbia Dept Phys & Astron 6224 Agr Rd Vancouver BC Canada NRC Herzberg Astron & Astrophys 5711 West Saanich Rd Victoria BC Canada Dunlap Observ 50 St George St Toronto ON Canada

ISBN: (纸本)9781510653528;9781510653511

We present the last developments of the Multi-Object adaptive optics (MOAO) demonstrator for the Gemini Infra-Red Multi-Object Spectrograph (GIRMOS). The GIRMOS MOAO system will able to deliver an image quality close to the diffraction-limit in the near-infrared (1.0-2.4 mu m) by taking advantage of the GLAO corrected wavefront delivered by the future Gemini North adaptive optics (GNAO) facility and performing an additional MOAO correction. MOAO is particularly challenging and risky because the DM is controlled in open-loop and usually subject to the so-called DM go-to-error which are difficult to model and manage. Therefore, as part of the preliminary design phase of the instrument, we decided to build a one-to-one scale demonstrator to mitigate some risks, exercise MOAO calibration techniques between two AO systems (GNAO and GIRMOS) and characterize of the MOAO performance. GIRMOS is a complex AO instrument and to circumvent the cost and complexity of such a system we are using a spatial light modulator (SLM) allowing the generation of turbulence in specific directions in the field without the need of pick-off system. In this paper, we present the status of the GIRMOS MOAO prototype. We exercised MOAO calibration and characterized the open-loop error and the GIRMOS MOAO performance in laboratory. We found, thanks to the GLAO- MOAO design, a very small open-loop error of about 60 nm rms. In addition, the GIRMOS MOAO design includes a figure source to compensate the DM accuracy errors. Using the figure source in laboratory, we compensated about 37 nm rms of go-to errors reducing the open-loop error down to 44 nm rms.

关键词： adaptive optics Multi-Object adaptive optics open-loop adaptive optics Laser Tomography Gemini Observatory Integral Field Spectroscopy GIRMOS

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Developing the prototype adaptive optics system for the Gemini Infra-Red Multi-Object Spectrograph 7

Developing the prototype Adaptive Optics system for the Gemi...

引用

Conference on adaptive optics Systems VII

作者： Conod, U. Jackson, K. Lardiere, O. Chapman, S. Turri, P. Lamb, M. Sivanandam, S. Sivo, G. Veran, J-P Univ British Columbia Dept Phys & Astron 6224 Agr Rd Vancouver BC Canada NRC Herzberg Astron & Astrophys 5711 West Saanich Rd Victoria BC Canada Dunlap Observ 50 St George St Toronto ON Canada Gemini Observ AURA Colina El Pino S-NCasilla 603 La Serena Chile

ISBN: (纸本)9781510636842

We present our development of the Multi-Object adaptive optics (MOAO) system for the Gemini Infra-Red Multi-Object Spectrograph (GIRMOS). The GIRMOS MOAO system consists of four identical arms patrolling over a large field-ofregard (2 arcmin) and able to deliver an image quality close to the diffraction-limit in the near-infrared. The AO system of GIRMOS will performed MOAO correction on top of the wavefront delivered by the Gemini North AO (GNAO) system. We are currently prototyping one arm in the laboratory in order to validate the simulated performances and characterize the hardware as well as different MOAO control strategies. GIRMOS MOAO is a complex AO system and a complete lab characterization would require a full GNAO simulator with a pick-off system and multiple wavefront sensors (WFS), light sources, etc. To circumvent the cost and complexity of such a system we are using a spatial light modulator (SLM) allowing the generation of residual turbulences in specific directions in the field without the need of pick-off system. Coupled with a numerical end-to-end model of the system, our bench is focused on open-loop control rather than tomography. In this paper, we review the GIRMOS MOAO preliminary design of the system, the baseline performances and the status of the testbed.

关键词： adaptive optics Multi-Object adaptive optics open-loop adaptive optics Laser Tomography Gemini Observatory Integral Field Spectroscopy GIRMOS

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