Changes between Version 17 and Version 18 of AstroTechTalk

Timestamp:

18 Sep 2014, 15:33:48 (10 years ago)

Author:

gaessler

Comment:

typo

AstroTechTalk

@@ -27 +27 @@
 || '''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, 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.[[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 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. [[BR]][[BR]]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! [[BR]][[BR]]Talk: German                                          [[BR]]Slides: English                              [[BR]]Questions: German, English ||
-|| 26.09.2014 || '''Tom Herbst''' || '''LINC-NIRVANA[[BR]][[BR]]'''[[BR]]LINC-NIRVANA is an ambitious high resolution imager for the LBT, and it is  currently the largest single instrument contribution at the MPIA. We  are also also the Principal Investigator institute, and hence are  responsible for the complex integration and testing phase now underway.[[BR]][[BR]]LN uses Multi-Conjugate Adaptive Optics (MCAO) for high-sky-coverage diffraction-limited imagery and (eventually) interferometric beam combination. The last two years have seen both successes and challenges. On the one hand, final integration is proceeding well in the lab. We also achieved First Light at the LBT with the Pathfinder experiment. On the other hand, funding constraints have forced a significant re-planning of the overall instrument implementation. Tom Herbst presents the  progress and plans for bringing the remainder of the instrument online  at the telescope in the next year.'''[[BR]][[BR]]'''Talk: Englisch                  [[BR]]Slides: German??[[BR]]Questions: German, Englisch ||
+|| 26.09.2014 || '''Tom Herbst''' || '''LINC-NIRVANA[[BR]][[BR]]'''[[BR]]LINC-NIRVANA is an ambitious high resolution imager for the LBT, and it is  currently the largest single instrument contribution at the MPIA. We  are also the Principal Investigator institute, and hence are  responsible for the complex integration and testing phase now underway.[[BR]][[BR]]LN uses Multi-Conjugate Adaptive Optics (MCAO) for high-sky-coverage diffraction-limited imagery and (eventually) interferometric beam combination. The last two years have seen both successes and challenges. On the one hand, final integration is proceeding well in the lab. We also achieved First Light at the LBT with the Pathfinder experiment. On the other hand, funding constraints have forced a significant re-planning of the overall instrument implementation. Tom Herbst presents the  progress and plans for bringing the remainder of the instrument online  at the telescope in the next year.'''[[BR]][[BR]]'''Talk: Englisch                  [[BR]]Slides: German??[[BR]]Questions: German, Englisch ||
 || 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 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 severalchallenges 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! [[BR]][[BR]]Talk: Englisch                  [[BR]]Slides: German[[BR]]Questions: German, Englisch ||