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/HotListphinzPhil Hinz2014-10-05 06:41:02+00:002014-10-05 06:41:02updated7Added tag - hotphinzPhil Hinz2014-10-05 06:40:59+00:002014-10-05 06:40:59addTag6phinzPhil Hinz2014-10-04 03:51:08+00:002014-10-04 03:51:08updated5phinzPhil Hinz2014-10-04 03:48:32+00:002014-10-04 03:48:32updated4phinzPhil Hinz2014-10-04 03:43:21+00:002014-10-04 03:43:21updated3phinzPhil Hinz2014-10-04 03:28:04+00:002014-10-04 03:28:04updated2First createdphinzPhil Hinz2014-10-04 03:21:14+00:002014-10-04 03:21:14created1weblog2014-10-05T06:41:02+00:00groups/lbti/weblog/74d8cFalseLBTI October Run: Night 2/groups/lbti/weblog/74d8c/LBTI_October_Run__Night_2.htmlPhil Hinz7 updatesLBTI October Run: Night 2
Night 2 of our run was clear and calm. We continued Kepler followup in the first half of the night. Justin Crepp and his team were here to obs...Falsephinz2014-10-05T06:41:02+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…