Changes between Version 233 and Version 234 of AstroTechTalk

Timestamp:

24 Oct 2016, 09:38:23 (8 years ago)

Author:

Ralph Hofferbert

Comment:

--

AstroTechTalk

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 || '''14.10.2016''' || '''Claudia Reinlein (Fraunhofer IOF, Jena)''' || '''Active and Adaptive Optics at the Fraunhofer IOF'''[[BR]][[BR]]Active and Adaptive Optics is more and more used in ground-based telescopes and also in discussion for space telescopes. For both types of systems there are completely different technological requirements. While space telescopes mainly aim for active optics, ground-based systems apply both active and adaptive optics.[[BR]][[BR]]This talk describes the technological features and the state of the art of "deformable mirrors / AO systems". And here the focus will be set onto research and development projects of the Fraunhofer IOF (Jena).[[BR]][[BR]]In the framework of an ESA project, a test breadboard is developed, in order to demonstrate the capability to compensate for static aberrations in using active mirrors in space telescopes. In the future, telescopes with a diameter of 4-16m will be used for the search for extraterrestrial life. In this context, IOF develops and investigates an active mirror with "set-and-forget" characteristics to compensate for aberrations conditional of manufacture and assembly. [[BR]][[BR]]For the European Extremely Large Telescope  (E-ELT) a technology development for extreme AO (X-AO)  is conducted. In this context, the talk will inform about a technological pre-investigation (design) of a deformable mirror with 11000 actuators.  [[BR]][[BR]]For laser communication between a ground-station and a geostationary satellite, the pre-compensation of aberrations is a technique to increase the signal intensity at the receiver and to attenuate disturbing speckles. The talk will also present the real-time AO of the Fraunhofer IOF and its compensatory efficiency as a function of the correction angle.[[BR]][[BR]]Presentation: German                  [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-10-14_AAO-Fraunhofer.pdf Slides: English][[BR]]Questions: German, English ||
 || '''21.10.2016 '''[[BR]]'''[[span(style=color: #FF0000, HdA-Auditorium!!)]]''' || '''Eike Guenther (TLS, Tautenburg)''' || '''Instrumentation projects of the [[BR]]Thüringer Landessternwarte''' '''Tautenburg '''[[BR]][[BR]]The Thüringer Landessternwarte (TLS) operates a 2m Alfred-Jensch telescope and a LOFAR radio telescope in Tautenburg and is involved in a number of instrumentation projects for various telescopes. In this talk the instrumentation of the telescopes in Tautenburg and other projects are reviewed. [[BR]][[BR]]Although the Alfred-Jensch telescope was built more than 50 years ago, it is continuously upgraded with new instrumentation. Currently in use are a high-resolution Echelle spectrograph, which is used for exoplanet-research, and a low-resolution faint-object spectrograph. Additionally, there is also a CCD camera in the prime-focus, which is used for imaging. Building on the experience with these instruments the TLS also participated in a number of international instrumentation projects. The first one was GROND, a multi-channel camera for the ESO/MPG 2.2m telescope at La Silla. Others were the HERMES spectrograph for the Mercator telescope in La Palma and the two calibration units for CARMENES. Still ongoing is the upgrade of CRIRES to CRIRES+, which is a high-resolution NIR spectrograph for the VLT. Being studied is GTI, a multi-channel camera that is specifically designed for the follow-up observations of exoplanet candidates of TESS and PLATO. [[BR]][[BR]]The TLS also hosts a LOFAR station. LOFAR is the Low-Frequency Array, an instrument for performing radio astronomy in the wavelength range from 1.2 to about 10 m. It is being built by ASTRON, the Netherlands Institute for Radio Astronomy and its international partners, and operated by ASTRON's radio observatory of the Netherlands Organisation for Scientific Research. About 40 stations are located in the Netherlands, additional ones are in Great Britain, France, Sweden, and Germany.[[BR]][[BR]]Presentation: German                  [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-10-21_TLS.pdf Slides: English][[BR]]Questions: German, English ||
-|| '''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: German                  [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-10-28_MICADODerot.pdf Slides: English][[BR]]Questions: German, English ||
+|| '''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 ||
 || '''04.11.2016''' || '''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 phenomenoligically descibe 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.pdf Slides: English][[BR]]Questions: German, English ||
 || 11.11.2016 || Vianak Naranjo || Characterization of Infrared Detectors - What is that? ||