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--- uc:uc20240206_february_6_2024 [2024/02/12 17:55]
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 === Introductions ===
-We started by introducing Mark Croom, our newest part-time Observing Specialist. Mark is an upper level Astronomy graduate student at NMSU and spent the majority of his career as an aerospace engineer at NASA Langley Research Center before pursuing his passion for astronomy. Although he has been a long-term user of the 3.5m at APO, he began his training as an Obs-spec in January 2024. We look forward to working with him!
+We started by introducing Mark Croom, our new part-time Observing Specialist. Mark is an upper level Astronomy graduate student at NMSU and spent the majority of his career as an aerospace engineer at NASA Langley Research Center before pursuing his passion for astronomy. Although he has been a long-time user of the 3.5m at APO, he began his training as a 3.5m obs-spec in January 2024. We look forward to working with him!
 === User feedback and comments from institutional representatives ===
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 ) Operations
-.5m Telescope:
 .5m Telescope: Telescope is working well, motion errors seem to be of the seasonal type.
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 General  updates: Jamey thanked to Kevin and other APO users for stopping by the APO booth at the January 2024 AAS meeting; it was nice to meet folks in person after only knowing them through Zoom. The weather at APO has been terrible in December-January. The DSSI team will be here this month, and we are looking ahead to a class visit from CU next month (thanks for CU and OU for being proactive and doing the early planning for their class visits in March and April, respectively). We have been seeing some seasonal motion errors on the  3.5m. The 0.5m has an issue with syncing the time; we are still working on it. The new slits for KOSMOS arrived; after making some small adjustments they are now mounted and available for use.
-Snow on the roof issue: The recent winter weather has impacted our ability to open, even during clear nights, due to the accumulation of snow on the enclosure roof. [If we open the enclosure when there is snow on the roof, it will fall down onto the telescope.] There are heaters on the edge of the dome building (not across the top), which we use to help melt the snow. However, the main mechanism for snow removal is the sunshine; if it's not sunny (as it has not been shortly after the recent snow storms), it won't melt. Previously we have had staff members go onto the roof while wearing safety harnesses to shovel it off. This raised safety concerns from NMSU's Environmental Health and Safety (EHS) office during their annual safety training. An EHS representative is coming to site this week to inspect and discuss the situation; we may need to modify the hook points used for attaching the people wearing harnesses. We are looking at other options as well, e.g. using long pole to reach the snow, possibly adding more heaters (but we need to be careful about ruining dome seeing). We recently put in cameras so we can see the snow on top and know how much there is. The heaters have to be shut off at -2 C. If we operate them when the temperatures are near freezing then we run a risk of building up ice later from the melt. This makes it less likely to have snow blowing onto the telescope but more likely to cause damage if ice falls. This is also why some we have some wintertime opening restrictions where the wind speeds must be low. If the winds are below our normal limit but still above that special wintertime/snow limit then we must stay closed, which we recognize is frustrating for users. One person asked if it would be possible to add some sort of structure with sloped sides onto the existing roof? Jamey replied that this would require not only changing the roof but the doors (to accommodate the additional weight), so it is likely cost prohibitive. The bottom line is that we recognize that these closures are frustrating for our users, We are committed to identifying a strategy that can help us remove the snow fairly soon after it falls while ensuring the continued safety of our staff and telescope.
+Snow on the roof issue: The recent winter weather has impacted our ability to open, even during clear nights, due to the accumulation of snow on the enclosure roof. [If we open the enclosure when there is snow on the roof, it will fall down onto the telescope.] There are heaters on the edges of the dome building (not across the top), which we use to help melt the snow. However, the main mechanism for snow removal is sunshine; if it's not sunny -- which has been the case after the recent snow storms -- the snow on the roof won't melt. Previously we have had staff members go onto the roof while wearing safety harnesses to shovel it off. This raised safety concerns from NMSU's Environmental Health and Safety (EHS) office during their annual safety training. An EHS representative is coming to site soon (their visit last week was postponed due to inclement weather) to inspect and discuss the situation; we may need to modify the hook points used for attaching the people wearing harnesses. We are looking at other options as well, e.g. using long poles to reach the snow, or possibly adding more heaters (but we need to be careful about ruining dome seeing). We recently put in cameras so we can see the snow on the roof and know how much there is. The heaters don't work well at temperatures below -2 C. If we operate them when the temperatures are near freezing then we run the risk of building up ice from the snow melt. This makes it less likely to have snow blowing onto the telescope but more likely to cause damage if that ice falls. This is also why we sometimes have wintertime opening restrictions where the wind speeds must be low. If the winds are below our normal limit but still above that special wintertime/snow limit then we must stay closed, which we recognize is frustrating for users. One person asked if it would be possible to add some sort of structure with sloped sides onto the existing roof? Jamey replied that this would require not only changing the roof but also the doors (to accommodate the additional weight), so it would likely be cost prohibitive. The bottom line is that we recognize that these closures are frustrating for our users, and we are committed to identifying a strategy that can help us remove the snow fairly soon after it falls while ensuring the continued safety of our staff and telescope.
-ARCES issue: ARCES had a failure in its autofill system that caused it to warm up, taking it over service for several weeks. We are pumping it down right now and then will cool it. The earliest possible date that it will return to service is likely around February 16, but it could extend beyond that. The dewar is a big volume to pump down and the cooling will be rather delicate. It has been at least a decade since we have done this in winter time. We have all of the replacement parts for fill system in hand and they are ready to be installed.
+ARCES issue: ARCES had a failure in its autofill system that caused it to warm up, taking it out of service for several weeks. We are pumping it down right now and then will cool it. The earliest possible date that it will return to service is likely around February 16, but it could extend beyond that. The dewar is a big volume to pump down and the cooling will be rather delicate. It has been at least a decade since we have done this in wintertime. We have all of the replacement parts for fill system in hand and they are ready to be installed.
-DIS issue: The DIS red channel seems to have had an electronics failure, with all pixels reading the same value. There are no immediate plans to repair it.
-DIS - future outlook - retirement
-Russet - we have tried every intervention we can do from the outside to recover the red camera Currently don't have in house expertise to cover repair. May be a few things to try next week. We
-No one using
-Couple of slots left for gratings in KOSMOS - someone at UW likes DIS because higher res, other because get whole spectrum in one shot - could add lower res or higher res gratings
-Joanne - vote for higher res for velocities - determining if star is member of globular cluster
-Russet: KOSMOS does have to grisms not gratings. 4 open slots but 1 needs to be left open (2 higher res and one lower?)
-Joanne - any estimates of costs of grisms? NC : estimates $10-30k?
-Do have a complete set of 1.25" slits (low and high pos) better matched to site seeing, can optimally sample site seeing now
+DIS issue: The DIS red channel has had an electronics failure, with all pixels reading the same value. There are no immediate plans to repair it; we have tried every intervention we can do from the outside of the instrument to recover the red camera and not met with any success. We currently don't have the in-house expertise to do an internal repair. This raises the broader issue of when (not if) to decommission DIS. As the oldest instrument on the 3.5m, it continues to show its age and perform sub-optimally. Recall that the acquisition of KOSMOS was intended as a stop-gap measure that would provide continued capability for long-slit optical spectroscopy while Ocotillo is being developed and built. Nearly all former DIS users have migrated to KOSMOS, but there remain a few DIS holdouts. **UC reps: please tell your users that we need to understand what capabilities KOSMOS lacks that makes some people still want to use DIS.** If it is a resolution issue (either the desire for higher or lower resolution than what is offered by KOSMOS), we still have several slots remaining in the wheel that holds the grisms for KOSMOS. If people want/need different resolution, in principle we could fulfill this need with the addition of one low-res grating that would get the entire spectrum in one shot, and two higher-res gratings. Russet noted that we do now have a complete set of 1.25" and 20" slits (low, center, and high position) which are better matched to the site seeing, so users can now optimally sample the site seeing. **Nancy will follow up with Sarah to get some ROM estimates of costs for additional grisms.**
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 === 2024 Q1 3.5m scheduling ===
-There have been some updates to Q1 based largely on reshuffling ARCES time around. Short slot on Feb 18B and Feb 22A (HN - 1 hr) - can't guarantee that ARCES will be back in time, not sure if can use it to repay echelle users but anyone who lost weather free to request Feb 18B, Feb 22A is bright. Have some additional time available in March (DD01 - full night) and could request other time in March.
+There have been some updates to the Q1 schedule based largely on having to reshuffle time that was scheduled to use ARCES. There is a short OPEN slot available on Feb 18B and a slightly longer one (bright time) on Feb 22A. At this point we cannot guarantee that ARCES will be back in service by that time so we're not sure if  we can use those OPEN slots to repay any displaced ARCES users, but anyone who lost time due to weather, telescope or instrument issues is free to request Feb 18B or 22A. There is some additional OPEN and DD time available in March so people can also request some of that.
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 === 2024 Q2 3.5m scheduling ===
-Q2 allocation emails went to schedulers. Requests are due by 2/23. Going on assumption that echelle will be back. DIS Red bad.
+The Q2 allocation emails were sent to the institutional schedulers, with requests due by February 23. We are expecting that ARCES will be back in operation by Q2, and that DIS red will remain inoperable.
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 === 2024 Q1 0.5m scheduling ===
-Q1 schedule is basically full. One week when have classes on site is listed as unavailable. q2 call in mid-March.
+The Q1 schedule for ARCSAT is basically full. There is one week that is listed as unavailable when we will have classes on site. The Q2 call for proposals will be issued in mid-March.
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 === Meetings ===
-  * Jan. 2024 AAS Recap - thanks to those who participated in booth - great to see the users who say "my first observing was at APO" - Jamey enjoys going. Misty - motivation - recruitment for ARC partners? science highlights? job openings/recruitment?
+  * Jan. 2024 AAS Recap - Thanks to those who participated in booth; it was great to see current and former APO users. Jamey enjoys going to the AAS meetings to represent APO and values making connections with our user community. When Nancy asked the group to consider whether we need to have a presence at EVERY winter AAS meeting, Misty asked what is the motivation for our participation (recruitment for ARC partners? science highlights? job openings/recruitment?). Currently all of our observing time is spoken for between ARC members and lease partners, so it is less about recruitment for ARC and more about showcasing science from the facility and advertising open positions.
-  * 30th anniversary celebration? - possibility to extend celebration at BoG meeting? Misty and Joanne enjoyed 2014  meeting, George Wallerstein memorial something, star party + small conference
+  * Nancy asked the group to consider one last time the idea of holding an APO 30th anniversary celebration during 2024. We will likely do something to mark the occasion at the ARC Board of Governors meeting in November; the question is whether to do something beyond that (a party? a small science symposium? at APO? dovetailed with the BoG meeting in Chicago? something else?). We discussed a few options but did not reach a consensus.
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   * None
+Open action items from this meeting:
+  * UC reps: ask your users what capabilities KOSMOS lacks that makes some people still want to use DIS
+  * Nancy: get ROM costs for new KOSMOS grisms
+  * UC reps: remind your users to review the Q1 schedule and request OPEN/DD time if they can make a good case for it.
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 === All Other Business ===
-DIS decommissioning?
+None.
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