| 32 | 32 | || '''21.10.2016 '''[[BR]]'''[[span(style=color: #FF0000, HdA-Auditorium!!)]]''' || '''Eike Guenther + Michael Pluto (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 Part1] [https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2016S2/2016-10-21_TLS-LOFAR.pdf Part2][[BR]]Questions: German, English || |
| 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 || |
