Changes between Version 11 and Version 12 of AstroTechTalk

Timestamp:

15 Sep 2014, 17:27:19 (10 years ago)

Author:

gaessler

Comment:

casey abstract, link to slides martin

AstroTechTalk

@@ -25 +25 @@
 
 ||'''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]]Slides: English                              [[BR]]Questions: German, English ||
+|| '''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]]Vortrag: Englisch                  [[BR]]Präsentation: Deutsch[[BR]]Fragen: Deutsch, Englisch ||
+|| 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 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 ||
+|| 31.10.2014 || -- || GAIA Challange ||
 || 07.11.2014 || Roland Gredel || '''LUCI''' ||
 || 14.11.2014 || Stefan Meister || '''Azubipreise 2011-2014''' ||