APO 3.5-m Users Committee Phonecon, 3/19/07 Attending: Suzanne Hawley, Bruce Gillespie, Scott Anderson, John Bally, John Fulbright, Al Harper, Remy Indebetouw Absent: Jon Holtzman, Michael Strauss Minutes taken by Bruce Gillespie ********************************** User feedback, comments from institutional representatives: Princeton - (Strauss) [e-mailed from Michael: "For the record, our recent observing has been problem-free; nothing to report on that front from Princeton] JHU (Fulbright) - John noted that recent JHU programs have had better observing weather, and that some student site orientation has occurred. Chicago (Harper) - Al mentioned that an increase in the Chicago demand for the 3.5-m can be attributed to a couple of new observers being added at Chicago in the past year, and some new SDSS-inspired follow-up observing programs. Washington (Anderson) - Scott reiterated the desire of their new users for a TUI interface to SPIcam. NMSU - (Holtzman) no report Virginia (Indebetouw) - Remy said he's received no recent user feedback. Colorado (Bally) - John talked about the recent fast sub-frame observing mode for NIC-FPS, which was implemented to support the Pluto occultation. One glitch discovered is that if you ask for full- frame exposures with Fowler sampling set to a large number, the instrument control computer crashes. John is also working on the NIC- FPS users manual with Jon Holtzman. ********************************** Discussion of telescope/instruments report - Gillespie: The report is given below; there was only a little discussion. ************************* 3.5-m Telescope, Instruments, and CIF Projects Highlights, 2/20/07 through 3/16/07 Bruce Gillespie 0) Overview It has only been three weeks since the last meeting, so there is not much to report. The weather at the site is beginning to be spring- like, with some unusually warm temperatures and some windy conditions. The telescope and instruments have been largely well- behaved, and the commissioning run of Agile (the UW high-speed photometer) has just begun. Various engineering activities and tests have made progress. 1) Telescope Other than routine maintenance and repairs, not much happened with the telescope during the period, and it performed very well. There was an isolated problem with one of the collimation/focus actuators on the secondary mirror, and tightening a coupling seemed to fix the problem. Some testing was done related to CIF projects (see below) 2) Instruments DIS: The recent troubles with warm-ups on the red camera appear to have been solved by the cryotiger work done last month. NIC-FPS: Tests were run to enable fast sub-framing operation of the detector, in support of the upcoming Pluto occultation observing program. Agile: [in commissioning--report to be given at the meeting by Suzanne] 3) Engineering and CIF projects Nick McDonald made additional measurements of the repeatability of the tertiary mirror rotation as part of the design studies for upgrading the tertiary mounting system--it now appears hopeful that the tertiary rotation is not making any significant contribution to pointing errors. He also has completed assembling the rebuilt "old" telescope drive boxes that are intended as hot-swappable spares for the telescope. Tests of the confocalness of the NA2 guider and the main image focal plan were continued, indicating that we may indeed be able to use the guider focus to slave the focus of the telescope, aka "auto-focus". Some software work needs to be done to continue this project. A new version of the TCC and TUI were released. 4) Miscellaneous The summer shutdown plans are firming up, which is being targeted for 20 August through 16 September (plus three days in July); the work list is given in the minutes of the last Users Committee meeting. The old tower anemometer was repaired (a broken optical fiber), and a new "backup" anemometer was installed on the roof of the Baldwin Operations Building. The two devices give different results due to their locations (the tower readings are higher), so a calibration correction is being researched to apply to the data from the backup system. ********************************** New plans for NIC-FPS - Bally: John reported that Stephane Beland is now working on NIC-FPS two days/ week--telescope staff and users should send problem reports to both John (bally@casa.colorado.edu) and Stephane (sbeland@colorado.edu). o The NIR Fabry-Perot etalon and controller have returned from England and are back at Boulder, and a dewar has been ordered to test the etalon at cryo temperatures. The etalon controller has been modified to have a slower x10 response time, in order to eliminate the oscillations seen earlier. A CU student is lined up to help with the tests, which will use the engineering-grade chip with the Rockwell controller (the one we didn't choose to use at APO). If the cryo test don't work, they will modify the F-P so that it runs at a warmer temperature, 180 to 200 degrees K. o The science-grade chip will most likely be sent to Rockwell to connect some leads that will enable reading all 16 channels of the array. This will reduce the read noise by allowing much faster multiple-read Fowler sampling, which we can't do now with the single- channel readout. Also, the video cards in the Leach controller will be replaced to handle the extra channels. There is some risk in having Rockwell work on the chip, but it is considered to be minimal, and the engineering-grade chip is a suitable backup if something bad happens to the science-grade chip. o CU proposes that ARC buy a second Leach controller for NIC-FPS, which then can be used for the tests in Boulder this summer, and then can be used as a spare at the site for both NIC-FPS and TripleSpec. Suzanne said that this proposal will be discussed in April during the engineering reviews being held at APO. John stated that the engineering work planned for NIC-FPS during the summer might keep the instrument in Boulder until ~October, and he will keep us posted on the schedule. ********************************** Agile update - Hawley: Agile, a high-speed blue/visible photometer is at APO for its initial commissioning runs. Everything fit together and it saw first light, but a cooling problem with the camera was encountered. A replacement camera is on its way and will hopefully be installed on the telescope for tonight's observing. Anjum Mukadum, Ed Mannery, and Russell Owen, all at UWash, are the team putting this instrument and software together. There were no non-Washington requests to use Agile in the 2nd quarter, but we hope that its usability will be proven to the level that it can be requested for use in the 3rd quarter by the general user community. Suzanne said that for a U=12 magnitude star, you can get 20,000 counts in U in about a second, and the read noise is expected to be ~10e. The chip is optimized for the UV and blue, but is also usably sensitive in the red. Anjum will send us a characterization of the instrument following its commissioning, which continues this week and later in May. ********************************** Actions from earlier meetings - group [open from previous months]: ACTION: Rene to collect history of 3.5-m publications, and Bruce will make a space for them on the APO website. STATUS: Gretchen and Don York have completed a draft the 3.5-m publications list. Once reviewed, it will be added as an appendix to the Futures Committee report (already available on the APO web site), and the list will also be placed in a stand-alone web location. Members of the Users Committee will be invited to check the list against known publications from the respective institutions. [new actions from last month]: ACTION: It would be good to do some tests to determine the accuracy of the [DIS grating] moves so users could evaluate if not checking after the move in special situations would be acceptable. STATUS: Mark Klaene is looking into this and will report back. ACTION: Suzanne will follow up with Russell Owen about TUI scripting. Users are encouraged to provide feedback to their users reps about integrating Spicam into TUI. STATUS: Suzanne talked to Russell and he is willing to put some modest number of scripts into TUI. He will talk to Jon Holtzman to discuss what scripts need to be ported, and how difficult it will be. Other users who use SPIcam scripts are encouraged to contact their users committee representative and Russell. ********************************** Update on Telescope Systems Workshop - Hawley: Suzanne added to the previous reports on the Workshop by saying that the mid-sized telescope Directors are planning to have a discussion about the possibility of future NSF funding in exchange for offering community access, particulary to "unique" capabilities, e.g., NIC-FPS Fabry-Perot. We are well positioned to take advantage of such a program because of our well-tested remote observing capability. ********************************** Next meeting: The next Users Committee phonecon will be on Monday, 16 April, at 8:30 AM Pacific Time. Agenda and other materials will be sent to the committee members during the preceding week. Topics will include reports on TripleSpec, the other engineering reviews being held in early April, and planned telescope improvement projects. 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