Last night was our first night testing out the nulling and phasing system since December. Our first three nights, used for general commissioning and science, were rocky and plagued by poor seeing. We had several failures which has made working with the system more challenging. Our right fine alignment mirror stopped working, presumably due to a problem with cooling it down. Similarly, our right pupil alignment motor was found to have failed. These problems required us to warm and open the beamcombiner in order to fix the problems. On the AO side we are seeing an unusually high occurence of loop failures, which were affecting our productivity.
Sunday night started out similarly. However, by 11 pm or so the seeing had calmed down and the AO systems stopped misbehaving. In brief, we achieved several milestones:
- Automated measurement of the null depth for use in scripts.
- First testing of measuring the K band to N band setpoint automatically via a script
- Measured and reduced the intensity mismatch to reduce the effect by 5x (~1% to 0.2%)
- First testing of automated nodding via a script to allow nulling measurements in both beams (doubles our efficiency).
- Acquired lengthy dataset to measure setpoint variations over time and elevation.
We are now on the sky for a second night and have more commissioning planned.
/groups/lbti/search/index.rss?tag=hotlist/groups/lbti/search/?tag=hotWhat’s HotHotListHot!?tag=hot1/groups/lbti/sidebar/HotListAdded tag - hotphinzPhil Hinz2010-10-15 20:37:53+00:002010-10-15 20:37:53addTag3phinzPhil Hinz2010-10-15 13:18:40+00:002010-10-15 13:18:40updated2First createdphinzPhil Hinz2010-10-15 13:05:39+00:002010-10-15 13:05:39created1weblog2010-10-15T13:18:40+00:00groups/lbti/weblog/b808eFalseFirst Night Results/groups/lbti/weblog/b808e/First_Night_Results.htmlPhil Hinz3 updatesFirst Night Results
It was an eventful first night on the LBT. Network connections failed, hardware refused to turn on, all the typical problems of a new instrument. Aft...Falsephinz2010-10-15T13:18:40+00:00hot/groups/lbti/search/index.rss?sort=modifiedDate&kind=all&sortDirection=reverse&excludePages=wiki/welcomelist/groups/lbti/search/?sort=modifiedDate&kind=all&sortDirection=reverse&excludePages=wiki/welcomeRecent ChangesRecentChangesListUpdates?sort=modifiedDate&kind=all&sortDirection=reverse&excludePages=wiki/welcome0/groups/lbti/sidebar/RecentChangesListmodifiedDateallRecent ChangesRecentChangesListUpdateswiki/welcomeNo recent changes.reverse5searchlist/groups/lbti/calendar/Upcoming EventsUpcomingEventsListEvents1Getting events…