[[Image(instrum8_gr.jpg, left, 219px)]][[Image(alfa3.5.gif, 232px)]][[Image(instrum4_gr.jpg, 123px)]][[Image(pedv3_gr.jpg, 138px)]] The [wiki:WikiStart AstroTechTalk (ger)] offers a place to discuss, for '''all interested colleagues''' and especially for the technical departments, the project leaders, the administration and the scientists as the ultimately users: * status of instrumentation projects * scientific tasks and features of the instruments in construction or planned * new possible involvements * technical innovations and developments * technical problems and their solutions * logistical problems and their solutions * how to improve operation and observation * project standards. '''Time: Always Fridays 11:00 - 12:00 ''' '''Location: Hörsaal''' '''Outline:''' * Announcements (news, visitors, etc.) (mainly in German) * Talk of about 30 min about a selected topic (German or English, will be announced) * Follow up discussion and questions (German or English, depending on the speaker) [[BR]]Please send proposals for talks via e-mail to: gaessler, hofferbert - or also available in room 021 or 211. ||'''Date''' ||'''Speaker''' ||'''Topic''' || || '''12.09.2014''' || '''Martin Kürster''' || '''The project landscape of the technical departments'''[[BR]][[BR]]Here's another one of those funny names for a new instrument. But actually, [[BR]]what is it about? Do you also sometimes feel like this? Martin Kürster will [[BR]]give us an overview of the instruments we are building at MPIA. From this, [[BR]]we should be able to get the connection between those acronyms and the [[BR]]instruments. But not only that, after several years of heavy overbooking of [[BR]]the technical departments the mid-term future of the project landscape has [[BR]]recently become a bit unclear due to repeated delays of the European [[BR]]Extremely Large Telescope (E-ELT). Martin Kürster will also tell us about [[BR]]possible future initiatives, project acquisitions still under discussion, that will [[BR]]pose new challenges for the technical departments.[[BR]][[BR]]Talk: German [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/WikiStart/2014-09-12_instrumentation_projects.pdf Slides: English][[BR]]Questions: German, English || || '''19.09.2014''' || '''Ralf-Rainer Rohloff''' || '''Precision metal optics over a large temperature range '''[[BR]] [[BR]]Since long, metal optics are an important part of astronomical instruments. Often [[BR]]diamond turned mirrors of aluminum (Al6061) are used. But it is difficult to polish [[BR]]aluminum. Therefore, the mirror is coated with Nickle Phosphor layer, which can [[BR]]be polished more easily. This is very important at shorter wavelength. But the [[BR]]mirrors deform with temperature changes because of the different coeffient of [[BR]]thermal expansion between aluminum and NiP. [[BR]][[BR]]Ralf-Rainer will tell us about a collaboration between MPIA Heidelberg and IOF [[BR]]Jean, which developed and tested a new material to minimize the temperature [[BR]]related deformation of such mirrors. The material consists of an aluminum [[BR]]silicate, which has a coefficient of thermal expansion close to NiP. Thus, the [[BR]]deformation could be reduced drastically. But now the work just started. Is it [[BR]]possible to built a mirror of this material? Does the material change with time? [[BR]]The best answer would be the study could show that such mirror can be built [[BR]]and are stable over time! [[BR]][[BR]]Talk: German [[BR]]Slides: English [[BR]]Questions: German, English || || 26.09.2014 || Tom Herbst || '''LINC-NIRVANA''' || || 03.10.2014 ||-- ||Tag der deutschen Einheit || || 10.10.2014 || Casey Deen || '''Alignment challenges and strategies for the GRAVITY wavefront sensor cryostat and tower[[BR]]'''[[BR]]Aligning a handful of small mirrors,filters, and lenses with a laser shouldn't be [[BR]]so difficult, right? Surely no more than an afternoon! But after another week [[BR]]spent huddled in a dark laboratory, the light still does not end up in the correct [[BR]]position on the detector! In order to avoid this frustrating situation, an alignment[[BR]]strategy is an important part of building any instrument. Casey Deen presents [[BR]]the alignment concept for the GRAVITY wavefront sensor. This near-infrared [[BR]]sensor works on the Shack-Hartman Principle. Due to their wavelength [[BR]]range, near-infrared sensors have a larger selection of bright guide stars than [[BR]]do optical sensors, as most stars are brightest in the infrared. Optical light is [[BR]]also attenuated more by interstellar dust, making optical sensors impractical [[BR]]in dusty regions like the Galactic Center. The wavefront sensors are located [[BR]]in the Coude rooms of the Unit Telescopes of the Very Large Telescope (VLT). [[BR]]The location and the optical design of the wavefront sensors present several[[BR]]challenges for alignment. Casey and his colleagues present their strategy for [[BR]]alignment of the optics, and are looking forward to hearing opinions, advice [[BR]]and concerns from the assembled experts at MPIA. Expect a lively discussion [[BR]]and insight on what is laboratory work about! [[BR]][[BR]]Vortrag: Englisch [[BR]]Präsentation: Deutsch[[BR]]Fragen: Deutsch, Englisch || || 17.10.2014 || Klaus Meisenheimer ?? || PANIC[[BR]]?? || || 24.10.2014 || || || || 31.10.2014 || -- || GAIA Challange || || 07.11.2014 || Roland Gredel || '''LUCI''' || || 14.11.2014 || Stefan Meister || '''Azubipreise 2011-2014''' || || 21.11.2014 || Jörg-Uwe Pott || '''MICADO''' || || 28.11.2014 || Oliver Krause || '''SPICA-SAFARI''' || || 05.12.2014 || || PLC - The new ESO standart?? || || 12.12.2014 || Tom Herbst || '''All sky camera @LBT''' || || 19.12.2014 || -- || Christmas party || || 26.12.2014 ||-- || Christmas ||