33 | 33 | || '''28.10.2016''' || '''Santiago Barboza''' || '''The MICADO derotator and its test stand at MPIA'''[[BR]] [[BR]]The Multi-AO Imaging Camera for Deep Observations (MICADO), a first light instrument for the 39m European Extremely Large Telescope (E-ELT), is being designed and optimized to work with the Multi-Conjugate Adaptive Optics (MCAO) module MAORY using laser guide stars. The MICADO-MAORY configuration will provide diffraction limited imaging over a large 53arcsec field of view. [[BR]] [[BR]] The current concept of the MICADO instrument consists of a structural cryostat (2.1m diameter and 2m height) with the wavefront sensor (WFS) on top (cryostat + WFS ≈ 4.000kg). The cryostat is mounted via its central flange directly to a large 2.5m-diameter image derotator. The whole assembly is suspended above the E-ELT Nasmyth platform by a hexapod-type support structure, which is located underneath the MAORY bench.[[BR]] [[BR]] MPIA is responsible for the design and development of the MICADO derotator, a key mechanism that must precisely rotate the cryostat assembly around its optical axis with a differential angular positioning accuracy lower than 10 arcsec, in order to compensate the field rotation due to the alt-azimuth mount of the E-ELT. This device consists of a high precision bearing, gear wheels, motors, encoders and very stiff mechanical interfaces. The MICADO derotator is being developed using a custom-made high-precision four-point contact ball bearing. [[BR]] [[BR]] With the intention of probing the current concept of the derotator in an early phase of the project, a prototype has been built using a standard 1.2m-diameter bearing. The test campaign is about to start during the next days and we will figure out if the proposed concept is able to reach the challenging angular positioning accuracy and other key performance figures required by the MICADO instrument.[[BR]][[BR]]Presentation: English[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-10-28_MICADODerot.pdf Slides: English][[BR]]Questions: German, English || |
34 | 34 | || '''04.11.2016 '''[[BR]]'''[[span(style=color: #FF0000, HdA-Auditorium!!)]]''' || '''Stefan Hippler''' || '''Adaptive optics for VLT and E-ELT'''[[BR]][[BR]]This talk summarizes in a very general approach the principles of adaptive optics (AO) and its value in the astronomical application. In part one, Stefan Hippler will specifically and phenomenologically describe how images are formed up during an observation through optical turbulence. A brief historical summary highlighting the achieved experimental milestones will conclude this introduction. [[BR]][[BR]]In part two of the talk, the AO systems of the famous ESO observatories on Paranal (VLT) and Armazones (E-ELT) will be brought into focus. With NACO and CIAO, two examples of already running instruments will be described in detail. This also allows a foresight to the currently designed advanced systems for ESO's new flagship mission in the mid twenty-twenties. [[BR]][[BR]]Presentation: German [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-11-04_AOOverview_Part1.pdf Slides: English Part1] [https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-11-04_AOOverview_Part2.pdf Part2][[BR]]Questions: German, English || |