The 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)

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 Here's another one of those funny names for a new instrument. But actually, what is it about? Do you also sometimes feel like this? Martin Kürster will give us an overview of the instruments we are building at MPIA. From this, we should be able to get the connection between those acronyms and the instruments. But not only that, after several years of heavy overbooking of the technical departments the mid-term future of the project landscape has recently become a bit unclear due to repeated delays of the European Extremely Large Telescope (E-ELT). Martin Kürster will also tell us about possible future initiatives, project acquisitions still under discussion, that will pose new challenges for the technical departments. Talk: German Slides: English Questions: German, English
19.09.2014	Ralf-Rainer Rohloff	Precision metal optics over a large temperature range Since long, metal optics are an important part of astronomical instruments. Often diamond turned mirrors of aluminum (Al6061) are used. But it is difficult to polish aluminum. Therefore, the mirror is coated with Nickle Phosphor layer, which can be polished more easily. This is very important at shorter wavelength. But the mirrors deform with temperature changes because of the different coeffient of thermal expansion between aluminum and NiP. Ralf-Rainer will tell us about a collaboration between MPIA Heidelberg and IOF Jean, which developed and tested a new material to minimize the temperature related deformation of such mirrors. The material consists of an aluminum silicate, which has a coefficient of thermal expansion close to NiP. Thus, the deformation could be reduced drastically. But now the work just started. Is it possible to built a mirror of this material? Does the material change with time? The best answer would be the study could show that such mirror can be built and are stable over time! Talk: German Slides: English 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 Aligning a handful of small mirrors,filters, and lenses with a laser shouldn't be so difficult, right? Surely no more than an afternoon! But after another week spent huddled in a dark laboratory, the light still does not end up in the correct position on the detector! In order to avoid this frustrating situation, an alignment strategy is an important part of building any instrument. Casey Deen presents the alignment concept for the GRAVITY wavefront sensor. This near-infrared sensor works on the Shack-Hartman Principle. Due to their wavelength range, near-infrared sensors have a larger selection of bright guide stars than do optical sensors, as most stars are brightest in the infrared. Optical light is also attenuated more by interstellar dust, making optical sensors impractical in dusty regions like the Galactic Center. The wavefront sensors are located in the Coude rooms of the Unit Telescopes of the Very Large Telescope (VLT). The location and the optical design of the wavefront sensors present several challenges for alignment. Casey and his colleagues present their strategy for alignment of the optics, and are looking forward to hearing opinions, advice and concerns from the assembled experts at MPIA. Expect a lively discussion and insight on what is laboratory work about! Vortrag: Englisch Präsentation: Deutsch Fragen: Deutsch, Englisch
17.10.2014	Klaus Meisenheimer ??	PANIC ??
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