[[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 || ||
|| '''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 || || ||
|| 03.10.2014 ||-- ||Tag der deutschen Einheit ||
|| 10.10.2014 || || ||
|| 17.10.2014 || || ||
|| 24.10.2014 || || ||
|| 31.10.2014 || || ||
|| 07.11.2014 || || ||
|| 14.11.2014 || Stefan Meister || Azubipreise 2011-2014 ||
|| 21.11.2014 || ?? Jörg-Uwe Pott  || ?? MICADO ||
|| 28.11.2014 || || ||
|| 05.12.2014 || || ||
|| 12.12.2014 || || ||
|| 19.12.2014 || || ||
|| 26.12.2014 ||-- || Weihnachten ||