4,923 research outputs found
Education and Training in St. Vincent and the Grenadines: A Partially Annotated Bibliography
No full textThis bibliography on “Education and Training in St. Vincent and the Grenadines” has been specifically prepared for the UWI School of Continuing Studies’ St. Vincent and the Grenadines Conference. It covers all aspects of education and training in St. Vincent and the Grenadines including: Academic achievement,economics of education, educational infrastructure, literacy and mathematics education
Analysis the MICADO-MAORY SCAO performance
No full textMICADO is the ELT near-infrared first light imager. It will provide diffraction limited images thanks to multi- conjugate adaptive optics (MCAO) and single-conjugate adaptive optics (SCAO) modes provided inside the MAORY module. The SCAO capability is jointly developed by MICADO and MAORY consortia and is motivated by scientific programs for which SCAO will deliver the best AO performance (e.g. exoplanets, solar system science, AGNs, etc) even for very faint objects. Numerical simulations were therefore required to assess the overall performance and explore WFS design parameters and associated calibration procedures. This study concluded to choose a Pyramid WFS (PWFS) working in the visible as the baseline for SCAO mode. We discuss the specific developments (PWFS diffractive model, ELT pupil shape, M4 geometry and influence functions, telescope perturbations...) implemented in the COMPASS simulation tool to achieve a fast and accurate ELT scale simulation. Thanks to its speed of computation we were able to span quickly a very large parameters space at the ELT scale. We explore the optimizations performed to deal with PWFS specific calibrations expected at the telescope (modal Basis, optical gains, NCPA management, island effect). We present a detailed error budget for each of the 5 turbulence conditions (seeing from 0.47" to 1.13") and guide star magnitudes between 10 to 17 (unresolved single star). We also studied the case of extended objects such as double stars or disk like source objects such as Titan. We finally conclude on the impact on performance using such extended objects for SCAO and PWFS
MICADO-MAORY SCAO Preliminary design, development plan & calibration strategies
No full textInternational audienceMICADO is the European ELT first-light imager, working in the NIR at the telescope diffraction limit. In addition to a wide-field MCAO correction provided by MAORY, the ELT first-light adaptive optics module, MICADO will also benefit from a SCAO correction developed under MICADO's responsibility and jointly by MICADO and MAORY. In a phased approach of the AO integration at the ELT, SCAO will be the first AO mode to be tested with MICADO at the telescope and will be ultimately offered as a MAORY mode. The SCAO module is made of a pyramid wave-front sensor, a real-time computer, a dedicated calibration unit, a dichroic plate and a specific mechanical structure, all of them being associated to their corresponding electronics and (either real-time or non real-time) software. MICADO and its SCAO module have successfully passed their preliminary design review last November (2018) at ESO. In this contribution, we first present the design of the SCAO module and its different subsystems as they have been validated by the PDR board. We also present the development plan of the SCAO module, emphasizing the key milestones with their specific tests during the AIT phase. These tests comprise an on-sky experiment with the SCAO pyramid wave-front sensor and RTC prototypes, using the CANARY demonstrator at the William Herschel Telescope, as well as successive validations in lab in France, in Germany and finally in Chile. We finally make a focus on the calibrations we plan to perform until and during the operations at the telescope
End-to-End simulations for the MICADO-MAORY SCAO mode
No full textInternational audienceMICADO is a E-ELT first light near-infrared imager. It will work at the diffraction limit of the telescope thanks to multi-conjugate adaptive optics (MCAO) and single-conjugate adaptive optics (SCAO) modes provided inside the MAORY AO module. The SCAO capability is a joint development by the MICADO and MAORY consortia, lead by MICADO, and is motivated by scientific programs for which SCAO will deliver the best AO performance (e.g. exoplanets, solar system science, bright AGNs, etc). Shack-Hartmann (SH) or Pyramid WFS were both envisioned for the wavefront measurement of the SCAO mode. In addition to WFS design considerations, numerical simulations are therefore needed to trade-off between these two WFS. COMPASS (COMputing Platform for Adaptive optics SyStems) is a GPU-based adaptive optics end-to-end simulation platform allowing us to perform numerical simulations in various modes (SCAO, LTAO, MOAO, MCAO...). COMPASS was originally bound to Yorick for its user interface and a major upgrade has been recently done to now bind to Python allowing a better long term support to the community. Thanks to the speed of computation of COMPASS we were able to span quickly a very large parameters of space at the E-ELT scale. We present the results of the study between WFS choice (SH or Pyramid), WFS parameters (detector noise, guide star magnitude, number of subapertures, number of controlled modes...), turbulence conditions and AO controls for the MICADO-MAORY SCAO mode
Norman Vincent Peale portrait
No full textPortrait of author and minister Norman Vincent Peale, ca. 1984. Peale was born on May 31, 1898, in Bowersville, Ohio. He graduated from Ohio Wesleyan University and became one of the most influential ministers of the twentieth century, known for his dynamic and energetic sermons. He preached an optimistic message that many Americans accepted during such trying events as the Great Depression, World War II, the Cold War, and the Civil Rights Movement. His sermons were broadcast on the radio and shown on television all across the United States. Peale also published forty-six books, his most popular being "The Power of Positive Thinking.
The MICADO first light imager for the ELT: overview of the SCAO module at its final design
No full textInternational audienceMICADO is the ELT first light instrument, an imager working at the diffraction limit of the telescope thanks to two adaptive optics (AO) modes: a single conjugate one (SCAO), available at the instrument first light and developed by the MICADO consortium, and a multi conjugate one (MCAO), developed by the MORFEO consortium. This contribution presents an overview of the SCAO module while MICADO and its SCAO are in the last phase of their final design review. We focus on the SCAO architecture choices and present the final design of the SCAO subsystems: the Green Doughnut structure, the SCAO wavefront sensor, the SCAO calibration unit, the SCAO ICS (i.e. AOCS) and the SCAO RTC. We also present the SCAO global performance in terms of AO correction, obtained from an error budget that includes contributors estimated from AO end-to-end simulations as well as instrumental contributors. Finally, we present the current SCAO subsystems prototyping and the main milestones of the SCAO AIT plan
Tests and characterisations of the ALPAO 64×64 deformable mirror, the MICADO-MAORY SCAO AIT facility
No full textInternational audienceMICADO is the ELT near-infrared first light imager. It will provide diffraction limited images using the singleconjugate adaptive optics (SCAO) mode developed inside the MAORY AO module. Although the MICADO-MAORY SCAO mode uses during regular operations the ELT wavefront correction capabilities (M4 & M5 adaptive mirrors), the SCAO system will not be able to work with them until the final instrument commissioning. Since it is crucial to test and validate the SCAO system during various AITs phases in Europe, the need of a high order deformable mirror with comparable number of degrees of freedom is required to test both spatial and temporal behaviour of the SCAO mode. For that purpose, the SCAO AITs in Europe will use the newly developed ALPAO 64×64 actuators deformable mirror (DM). Before using this deformable mirror in the context of the SCAO mode (i.e controlled by a non-linear pyramid WFS, we built a classical Shack-Hartmann WFS to ensure a proper linear wavefront measurement in the lab and perform the DM characterisation of its 3228 actuators. We present the preliminary results of the tests performed on this DM in a classical closed loop scheme. In particular we study the spatial wavefront correction, actuators additivity and linear response, maximum amplitude range (stroke), hysteresis and temporal stability
François Vincent
No full textGrandbois introduces Vincent's paintings and prints from 1992 to 1998, analysing the artist's main source of inspiration - the body - while describing his use of the three studios he frequents. Includes a text by Vincent on humour in art. Texts in English, French and Japanese. Biographical notes on artist and author
MICADO SCAO: to be or not to be... in MAIT
No full textInternational audienceMICADO SCAO: to be or not to be... in MAI
Kara Gust interviews author Jeff Vande Zande
No full textAuthor Jeff Vande Zande talks about teaching and writing, poems vs. short stories, developing characters in his stories based on his personal experience, and his current projects. Vande Zande is interviewed by Michigan State University Librarian Kara Gust for the MSU Libraries' Michigan Writer Series
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