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uc:uc20240305_march_5_2024 [2024/03/29 03:54]
nchanove |
uc:uc20240305_march_5_2024 [2024/03/29 04:02] (current)
nchanove |
| === Additional telescope and instrument discussion === | === Additional telescope and instrument discussion === |
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| Kevin France's CU class is on site right now. The weather is improving but a storm is coming this weekend. We have seen seasonal motion errors with the telescope but nothing out of ordinary. KOSMOS has been vacuum pumped and is now working normally. The 1.25 and 20" slits being worked on/tested. DIS red camera has been recovered. The echelle was taken out of service for a partial warm-up to warm up detector and keep the inter-order light from getting too bad. It was subsequently returned to service. The question was asked whether the warm-up of the echelle is related to the previous issue it had? Bill replied yes. There is some water vapor condensing on some surface that the CCD is seeing. In the past we have seen this after a pumping cycle and cool down, but it doesn't happen every time. This time, the contamination grew rapidly after the last pumping cycle and subsequent cool-down. In the past we have had success with just warming the inner dewar that contains the CCD while keeping other one cold; we think this forces the condensate to migrate to the coldest thing in the vacuum vessel. We will do this for about a week and then cool it back down, hoping to have better success. One observing program that had the echelle as their primary instrument was affected but KOSMOS was used as a backup instrument instead. There was a question about how the DIS red channel was brought back to life. Bill replied that the order of restarting the software and hardware was the solution. The new 20" KOSMOS slits have been added to the suite of slits and returned to service. The 1.25" slits had some machining issues and are being shipped back to UW to be remade; we hope that they will be available soon. The 2.1" is still most popular width. | Kevin France's CU class is on site right now. The weather is improving but a storm is coming this weekend. We have seen seasonal motion errors with the telescope but nothing out of ordinary. KOSMOS has been vacuum pumped and is now working normally. The 1.25 and 20" slits are being worked on/tested. DIS red camera has been recovered. The echelle was taken out of service for a partial warm-up to warm up detector and keep the inter-order light from getting too bad. It was subsequently returned to service. |
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| | Someone asked whether the warm-up of the echelle is related to the previous issue it had? Bill replied yes. There is some water vapor condensing on some surface that the CCD is seeing. In the past we have seen this after a pumping cycle and cool down, but it doesn't happen every time. This time, the contamination grew rapidly after the last pumping cycle and subsequent cool-down. In the past we have had success with just warming the inner dewar that contains the CCD while keeping other one cold; we think this forces the condensate to migrate to the coldest thing in the vacuum vessel. We will do this for about a week and then cool it back down, hoping to have better success. One observing program that had the echelle as their primary instrument was affected but KOSMOS was used as a backup instrument instead. |
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| | Someone asked how the DIS red channel was brought back to life given that the prognosis sounded pretty bad last month. Bill replied that finding the right order of restarting the software and hardware was the solution. The new 20" KOSMOS slits have been added to the suite of slits and returned to service. The 1.25" slits had some machining issues and are being shipped back to UW to be remade; we hope that they will be available soon. The 2.1" is still most popular width. |
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| ---- | ---- |
| Open action items from previous meetings: | Open action items from previous meetings: |
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| * UC reps: ask your users what capabilities KOSMOS lacks that makes some people still want to use DIS. Colorado report: they did not have any users who would be upset if DIS were no longer available. One user said that the capability they really need is full spectral cover with a lower resolution prism. Another user said they needed higher resolution for planetary nebula projects. A third user said they could use bot or either of those options, but they really emphasized the need for good sensitivity in the blue. UW report: their users require blue sensitivity, high spectral resolution, and Halpha coverage. NMSU report: their users need high resolution for line profile analysis, and could also make use of having a lower res mode that provided full spectral coverage in one go. OU report: their users find it frustrating that in the current KOSMOS configuration if you include Halpha then you don't get all of the blue. UVa report: they have one user who wants to continue using DIS. | * UC reps: ask your users what capabilities KOSMOS lacks that makes some people still want to use DIS. |
| | * Colorado report: they did not have any users who would be upset if DIS were no longer available. One user said that the capability they really need is full spectral cover with a lower resolution prism. Another user said they needed higher resolution for planetary nebula projects. A third user said they could use both or either of those options, but they really emphasized the need for good sensitivity in the blue. |
| | * UW report: their users require blue sensitivity, high spectral resolution, and Halpha coverage. |
| | * NMSU report: their users need high resolution for line profile analysis, and could also make use of having a lower res mode that provided full spectral coverage in one go. |
| | * OU report: their users find it frustrating that in the current KOSMOS configuration if you include Halpha then you don't get all of the blue. |
| | * UVa report: they have one user who wants to continue using DIS. |
| * Nancy: get ROM costs for new KOSMOS grisms. STATUS: OPEN | * Nancy: get ROM costs for new KOSMOS grisms. STATUS: OPEN |
| * UC reps: remind your users to review the Q1 schedule and request OPEN/DD time if they can make a good case for it. STATUS: CLOSED | * UC reps: remind your users to review the Q1 schedule and request OPEN/DD time if they can make a good case for it. STATUS: CLOSED |
