APO 3.5-m Users Committee Phonecon, 10/15/07 Attending: Suzanne Hawley, Bruce Gillespie, Mark Klaene, Scott Anderson, Michael Strauss, Russet McMillan, John Bally, Bill Ketzeback, Jon Holtzman, Jon Fulbright Absent: Remy Indebetouw, Al Harper Minutes taken by Bruce Gillespie ********************************** User feedback, comments from institutional representatives: Princeton (Strauss) - Michael said everything has been fine, with nothing specific to report. UVa (Indebetouw) - Remy was unavailable for the telecon, but submitted this: "People here are happy with their observing experiences but wish the weather would improve, and I looked at the instrument web pages and thought they were much improved from the previous. So good that I didn't have any suggestions." Bruce added that UVa is taking a group of students to APO in November. UW (Anderson, Hawley) - Scott and Suzanne reported that recently had a 14-person student group at APO for training and orientation. The trip was very successful and they gave compliments to the APO staff. CU (Bally) - John had no user feedback to report, and he is also bringing a large student group to APO in a couple of weeks. JHU (Fulbright) - Jon had recently returned from a long trip and had not heard any feedback while he was away. NMSU (Holtzman) - Jon said that he recently hosted a group of first- year grad students at APO, which was very successful. UChicago (Harper) - No report. ********************************** Discussion of telescope/instruments report - Klaene: The report is given below. Mark walked through the highlights, and there was some discussion: Telescope pointing difficulties and intermittent problems with tertiary rotation clamp have been continuing minor irritations; the pointing now seems to be under control, but we have yet to understand the nature of the tertiary clamp misfires. On instruments, things are nominal and the NIC-FPS status is given below as a separate agenda item. The APOLLO laser has had difficulties lately, which are being addressed by Tom Murphy. Agile had some earlier problems with timing pulses that seem to have been fixed in hardware. For the CIF projects, the tertiary support redesign work has begun, the new instrument rotator motor was tested, and the new axis controller will be tested on the sky soon. Russell Owen has begun work on autofocus. ************************* 3.5-m Telescope, Instruments, and CIF Projects Highlights, 9/13/07 through 10/10/07 Mark Klaene 0) Overview: Higher than average humidity and clouds continued to disrupt observing, however we have seen the expected break from the summer monsoonal weather pattern. SDSS construction continues without interruption to day-to-day operations. 1) Telescope: The telescope came out of shutdown on time and even produced some science data during the post-shutdown recovery time. Post-shutdown problems included tertiary rotation issues and pointing problems. Both of these have improved substantially. Tertiary rotation issues are still being investigated for a single- source problem, but is being managed to an acceptable level. Pointing problems were traced to issues with motor and encoder tracking. These were corrected by realigning the altitude drive systems. Current pointing errors are near normal levels. We plan to correct the remaining errors with a pointing model during the October engineering time. 2) Instruments DIS: no problems this period. SPICam: no problems this period. NIC-FPS: Etalon working well in the lab, 16-channel readout also working well, expect to resume use of the instrument without Etalon characterization by the scheduled Oct 20th run [see Bally report, below]. CorMASS: no problems this period. Plan to remove from Observing level floor week of October 22nd. Agile: Timing pulse problem occurred, corrected but root cause still under investigation. GFP: Operational. Apollo: laser and RF unit repaired, RF unit may still be subject to overheating and fix in work. 3) CIF projects Axis Controller: significant progress made, plan on-sky testing during October engineering time on rotator. New Rotator Motor: Modifications to mount completed, waiting new axis controllers. Autofocus: Resumed work on software actor rewrite. Tertiary: Continuing investigation and project planning stage. Agile Rotation: started project to build rotator and mount for TR2 port. ********************************** Wide-field NIR instrument followup - Hawley, Gillespie: Suzanne and Bruce reported that they have received no comments from users expressing opinions on the proposed wide-field NIR camera. Scott said he had talked to a few UW users, one-third of whom were supportive, one-third of mixed opinion (they would prefer wide-field visible) and on-third were negative (didn't want to lose telescope time in return for instrument). John Bally has talked to the instrument's PI, who visited John at CU. It appears feasible that the instrument's optics and detector would fit into the NIC-FPS dewar, but there would be political hurdles related to the current funding for the instrument. Suzanne asked if there were more feedback to report from users. John Bally thought that CU would have users interested, and that the NIC- FPS science niche is its etalon mode. Michael Strauss asked what the costs to ARC would be, and Suzanne said those details would need to be worked out. As an example, GFP, which s a long-term visiting instrument at APO, gets about 3 DD half-nights per quarter. This is mostly invisible to the ARC partners since it is part of the regular DD allocation that comes off the top. Bruce added that the cash cost to ARC for optics, baffling, site integration support would likely be of order ~$100k. Michael said he'd try to go back to the PU users for feedback. Jon Holtzman said he had not yet received feedback from the NMSU faculty, and will retry. Suzanne said that she needs to hear that there is a strong science interest among the users for this instrument in order to continue the discussion with the instrument PI. ACTION: The decision on whether or not to proceed with moving forward on the wide-field NIR camera proposal will be deferred to the next Users Committee meeting. In the meantime, committee members should make one more pass at soliciting expressions of interest from their user communities. Suzanne and Bruce will apprise the instrument group on where we are. ********************************** NIC-FPS status - Bally: John reported that today things are looking hopeful. Last week, while characterizing the science-grade chip, a higher-than-hoped-for level of horizontal pattern noise was seen. This is largely due to noise in the Leach controller that sets biases differently on a line- by-line basis. Doing a global chip reset, instead of line-by-line, removed most of the problem, and the CU engineers are talking to the Leach people about noise in their power supplies, although some of the problem may be due to the CU lab environment. Power-conditioning filters may also help. There is also an edge gradient that Fowler sampling should ameliorate. If all goes well, NIC-FPS should be ready for transport to APO this week, and could be available for on- sky testing sometime next week. With the new 16-channel fast readout, all users should be taking data with Fowler sampling. Recommendations for NFS (Number of Fowler Samples) values will be forthcoming in the new instrument manual. ********************************** New web pages for user documentation - Holtzman: Jon described recent progress in improving the organization and content of user documentation at APO's web site. We recently sent the Users Committee the URL of a "concept" webpage for user information; Gabrelle Saurage is taking the lead on layout and format, and Jon is collecting the relevant content. Michael said he looked at the page and thought it looked like a good start. Jon added that it's still a work in progress, and should converge over the coming weeks. Users Committee members should look at the new user webpages, solicit feedback from their user communities, and forward comments regarding content and organization to John and Gabrelle. Suzanne plans to report on the new documentation at the annual ARC Board meeting on 12 November. She thanked Jon and Gabrelle for their efforts in getting this moving forward. ACTION: Committee members to look at the new user test pages, report back to Jon Holtzman and Gabrelle Saurage suggestions for content and organization. ********************************** Science Highlights from '07 - Hawley, Gillespie: The 1-page-each Science Highlights for the annual report are due today, and only a couple have been received. We can extend the deadline to no later than this Friday, 19 October, if you have highlights you want to be seen by the ARC Board at its 12 November meeting. ********************************** Actions from earlier meetings - group [open from previous months]: ACTION: Users interested in a wide-field NIR camera at APO should send a paragraph or two to their Users Committee representative with copies to Suzanne and Bruce with an expression of interest and/or questions regarding this proposed instrument. STATUS: Deferred to 19 November, see new action item, below. ACTION: We need each institution's Users Committee member to poll their users and send science highlights (since Oct. '06) to Suzanne and Bruce, not later than 15 October, for inclusion in the annual report to the ARC Board. STATUS: Deadline extended to 19 October. [new actions]: ACTION: The decision on whether or not to proceed with moving forward on the wide-field NIR camera proposal will be deferred to the November Users Committee meeting. In the meantime, committee members should make one more pass at soliciting expressions of interest from their user communities. Suzanne and Bruce will apprise the instrument PI on where we are. ACTION: Committee members to look at the new user webpages, and report back to Jon Holtzman and Gabrelle Saurage suggestions for content and organization. ********************************** Next meeting: The next Users Committee phonecon will be on Monday, 19 November, at 8:30 AM Pacific Time. The agenda and other materials will be sent to the committee members during the preceding week. APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 1065 in the apo35-general archive. You can find APO the archive on http://www.astro.princeton.edu/APO/apo35-general/INDEX.html APO To join/leave the list, send mail to apo35-request@astro.princeton.edu APO To post a message, mail it to apo35-general@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO