|
Size: 5260
Comment:
|
Size: 5841
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 3: | Line 3: |
| [[Nika2Run72|Back to NIKA2 run 72 (Cryo run 84) main page]] <<BR>> | [[NIKA2Upgrade202|Back to NIKA2 Upgrade 2025 main page]] <<BR>> |
| Line 6: | Line 6: |
| = Plan for the NIKA2 re-commissioning (March 18th to 25th + March 30th to April 1st, 2025) = | = Plan for the NIKA2 upgrade operations (March 1st to 11th) = |
| Line 8: | Line 8: |
| See also the [[https://wiki.iram.fr/wiki/nika2/images/d/dd/Minutes_NIKA2_recommissioning_meeting_20250124.pdf|minutes]] of the [[https://wiki.iram.fr/wiki/nika2/index.php?title=NIKA2_upgrade_re-commissioning_preparation_2025|2025/01/24 meeting dedicated to the re-commissioning]] (at the difference of the minutes, which describe things as they were discussed during the meeting, the test plan below, originally extracted from these minutes, may contain few differences resulting from upgrades depending on possible evolution of the hardware situation and new information since the meeting. So please refer to this test run page for the actual plan that the re-commissioning team will follow (in principle differences should be marginal). Originally, two weeks were booked for the re-commissioning. The plan was to quickly assess the relative focus between the three arrays and decide if we need to re-open in order to move the arrays and bring them to the same focus position (as much as possible). The re-commissioning has now been reduced to one week in march and a second week at a later time, possibly at the end of May or beginning of June. In fact we realised that warming up takes 5 days, cooling down takes ~one week, and therefore re-opening the cryostat to move the arrays would occupy more than one week and we would have had no time for the second part of the re-commissioning (after the 2nd opening). |
The elements on the following sections focus on the upgrade operation plan and people coming to do it.<<BR>> - For more information on the historical background of the upgrade (since the discovery of the dichroic #2 "shadow effect" in 2018 we knew we wanted to upgrade NIKA2, changing several elements once the dichroic problem could be solved), browse the [[https://wiki.iram.fr/wiki/nika2/index.php?title=Nika2Wiki|NIKA2 collaboration private wiki]] commissioning notebook, hardware development, and documentation sub pages.<<BR>> - For more information on the upgrade as we have planned it, from the motivations to the various elements that will be changed and the expected gains in performances, see the [[https://wiki.iram.fr/wiki/nika2/index.php?title=NIKA2_Upcoming_Upgrades_planification_meeting_2023|June 2023]] and [[https://wiki.iram.fr/wiki/nika2/index.php?title=NIKA2_upgrade_preparation_meeting_2024|November 2024]] special meetings pages. In complement see also the [[https://publicwiki.iram.es/DailyReportsNika2Pool140125|w24 Pool #2 Daily report]], and NIKA2 weekly meetings with a section about the upgrade ([[https://wiki.iram.fr/wiki/nika2/index.php?title=May_15th,_2024|24/05/15]], [[https://wiki.iram.fr/wiki/nika2/index.php?title=May_29th,_2024|24/05/29]], [[https://wiki.iram.fr/wiki/nika2/index.php?title=June_12th,_2024|24/06/12]], [[https://wiki.iram.fr/wiki/nika2/index.php?title=June_26th,_2024|24/06/26]], [[https://wiki.iram.fr/wiki/nika2/index.php?title=July_10th,_2024|24/07/12]], [[https://wiki.iram.fr/wiki/nika2/index.php?title=August_28th,_2024|24/08/24]], [[https://wiki.iram.fr/wiki/nika2/index.php?title=January_8th,_2025|25/01/08]], [[https://wiki.iram.fr/wiki/nika2/index.php?title=January_22nd,_2025|25/01/22]], [[https://wiki.iram.fr/wiki/nika2/index.php?title=January_29th,_2025|25/01/29]]).<<BR>> - For more information about what is planed once the new elements are installed, see the [[GoalsPrepStaffNika2Run72|upgrade re-commissioning pages]]. |
| Line 18: | Line 17: |
| On site: Angel, Stergios, Stefano, Carsten, Juan Macias-Perez (to be confirmed) | On site: Samuel, Alessandro, Martino, Gregory Garde (from NEEL workshop), others (Dave, Carlos...) ? |
| Line 20: | Line 19: |
| Remotely: Nicolas (except 18/3 @ 17 and 21/3 in the evening), Xavier (20-24/3), Samuel, Alessia (18-21/3) | Remotely (people who may be contacted for particular questions in their domain of expertise) : Andrea, Juan ?, Nico ?, Xavier ?, others ? |
| Line 22: | Line 21: |
| Brisa is warned of the chance of using EMIR if anything goes wrong with NIKA2 | |
| Line 24: | Line 22: |
| == Hardware & tools situation == Hardware currently in Grenoble, to transport to the telescope (early January Samuel brought to NEEL everything that was at IRAM Grenoble): * 3x 1 mm Arrays new design + spares<<BR>> * Dichroic #1 with new Cu mount + Al+SS rings<<BR>> * 1x AR pyramids machined array-side lens<<BR>> * New "funny shape" extra optics baffle shield<<BR>> * 5x nex IR filters <<BR>> Already at the telescope (checked by Samuel during Jan 14-21 pool): * 2x AR pyramids machined array-side lenses<<BR>> * NIKA2 operation tool boxes<<BR>> * Super-insulator spare roll<<BR>> * PIMP with its mount, electronic gray box, and Raspberry control unit<<BR>> |
|
| Line 27: | Line 39: |
| * Feb 25th - March 3rd: warm up NIKA2 * NIKA2 will be already warm on 2025/03/04 |
|
| Line 28: | Line 44: |
| * Remove NIKA2 Nose (entrance window, temperature screen behind, M7 & M8 mirrors unit). * Slide all cryostat main body screens to the position were the nose was to access the 100 mK mount (aka "Robot Dog") on which all cold elements are mounted (dichroic, lenses, arrays...). Be extra careful with super insulator. * Change 1mm arrays * Change of cryo lenses * Change dichroic * Slide all cryostat main body screens back in place * Put back the M7-M8 unit, take care of the long tie rods in order to get the best possible alignment of the cryostat optics (important not only to get the optical axis of the whole system aligned with the center of the arrays so that without Nasmyth correction the image of the point source is at the center of the arrays, but more importantly to get the pupils well aligned so that the illumination of M1 from the cryostat optics is well centered, otherwise we would pickup some warm spillover from the background behind the telescope, degrading the signal to noise (sensitivity) and the beam shape quality). * While putting back the nose screen one by one, change IR-blocking filters mounted on them |
|
| Line 29: | Line 53: |
| * March 11th - 17th: NIKA2 cooling down (maybe start already on the 9th, see above) | * March 11th - 17th: NIKA2 cooling down (maybe start already on the 9th if we are as efficient as we hope for the preceding operations) |
| Line 31: | Line 55: |
| * March 18th: start the re-commissioning of NIKA2, after cooling down * We are going to use the use t22 account <<BR>> -> copy the current scripts into the directory PaKo/202503/ * IMPORTANT NOTE: if problems pop up during the recommissioning? <<BR>> -> re-open! (hardware people be ready) <<BR>> -> use EMIR meanwhile * March 18: the first action is the new sweep (Martino, Alessandro, Dave) * The second action is checking the radio alignment using the Eccosorb technic (added by SL, 30/01/2025). The following assumes radio alignment is correct (if not, either it can be compensated, or a re-opening is necessary, which means few hours to many days delay). * We then spend one-two days for the first characterization of the arrays, aimed at determining the new kidpars (IDL pipeline). Nicolas will work with us remotely during these first phase. Details are given below. * This process will take ~2 days, including the new kidpars/DAFs and likely also the verification of the relative focus between the arrays. It might be faster, but let's count ~2 days. * At this stage we planned to know if we need/want to re-open the cryostat to adjust the relative position of the arrays (along the z axis). We have decided to post-pone this decision to a later time, after a thorough analysis of the data taken during this first re-commissioning week. Two cases might apply: <<BR>> A. The re-opening will happen (very likely). We had originally scheduled it for March 30th (Sunday), but eventually decided it was safer in terms of people travel organization to reach this stage of knowledge of the upgraded instrument situation before taking decision (reverse everything / just move arrays / no re-opening necessary: go to B.). The following assumes we don't need to reverse everything.<<BR>> For the rest of the March 18-25th week, we proceed with the first part of the re-commissioning, aimed at characterizing the new arrays and test/characterize as much as possible the upgraded NIKA2 <<BR>> On March 25th (Tuesday, maintenance day) @ 10:30: start warming up NIKA2 Only if necessary (depends on the decision mentioned just above)<<BR>> On March 30th (Sunday) continue got get more re-commissioning data, possibly at the light of the processing of the preceding week data.<<BR>> At the date decided above, probably sometimes in April or early May: the 2nd hardware intervention will begin and will take 2 days. The arrays will be moved along the z-axis in order to bring them to the same focus (as much as possible) <<BR>> The 2nd half of the re-commissioning (after the 2nd intervention) will be at the end of May or beginning of June, because April is fully taken by EHT and in the first half of May not everyone will be available. <<BR>> A. we decide not to re-open (unlikely). <<BR>> We proceed with as many re-commissioning operations as possible, including the full characterization of the instrument, as described in the next Section below, including stage-2 operations such as a pointing session and de-focused beam-maps. |
* Once cool down has been started: check the optical alignment using the elevation axis lasers, and possibly the cryostat laser plate to be placed on the entrance window. <<BR>> * March 18th: Once the cryostat is cold, that KID traces can be displayed on the acquisition software GUI, and that the telescope can point a blank sky in good atmosphere conditions perform a radio alignment (has to be done by the team on site during the Mar 18th-25th week; see the [[GoalsPrepStaffNika2Run72|re-commissioning preparation page]], which contain a detailed description of the radio alignment procedure)<<BR>> For more details on the optical and radio alignments with NIKA2 check the following link: [[https://publicwiki.iram.es/Continuum/NIKA2/Main?action=AttachFile&do=view&target=History_of_optical_and_radio_alignments_of_NIKA2.pdf|History of optical and_radio alignments of NIKA2]]; this document (which is also available from the NIKA2 wiki main page) contains drawings that help understanding the procedures. |
| Line 61: | Line 63: |
Not sure it makes sense to describe all the operations the team will perform in details. This would be quite cumbersome and not necessarily super useful. |
Back to NIKA2 Upgrade 2025 main page
Plan for the NIKA2 upgrade operations (March 1st to 11th)
The elements on the following sections focus on the upgrade operation plan and people coming to do it.
- For more information on the historical background of the upgrade (since the discovery of the dichroic #2 "shadow effect" in 2018 we knew we wanted to upgrade NIKA2, changing several elements once the dichroic problem could be solved), browse the NIKA2 collaboration private wiki commissioning notebook, hardware development, and documentation sub pages.
- For more information on the upgrade as we have planned it, from the motivations to the various elements that will be changed and the expected gains in performances, see the June 2023 and November 2024 special meetings pages. In complement see also the w24 Pool #2 Daily report, and NIKA2 weekly meetings with a section about the upgrade (24/05/15, 24/05/29, 24/06/12, 24/06/26, 24/07/12, 24/08/24, 25/01/08, 25/01/22, 25/01/29).
- For more information about what is planed once the new elements are installed, see the upgrade re-commissioning pages.
Participants
(preliminary)
On site: Samuel, Alessandro, Martino, Gregory Garde (from NEEL workshop), others (Dave, Carlos...) ?
Remotely (people who may be contacted for particular questions in their domain of expertise) : Andrea, Juan ?, Nico ?, Xavier ?, others ?
Hardware & tools situation
Hardware currently in Grenoble, to transport to the telescope (early January Samuel brought to NEEL everything that was at IRAM Grenoble):
3x 1 mm Arrays new design + spares
Dichroic #1 with new Cu mount + Al+SS rings
1x AR pyramids machined array-side lens
New "funny shape" extra optics baffle shield
5x nex IR filters
Already at the telescope (checked by Samuel during Jan 14-21 pool):
2x AR pyramids machined array-side lenses
NIKA2 operation tool boxes
Super-insulator spare roll
PIMP with its mount, electronic gray box, and Raspberry control unit
Overall schedule
- Feb 25th - March 3rd: warm up NIKA2
- NIKA2 will be already warm on 2025/03/04
- March 4th - 11th: NIKA2 hardware upgrade
Remove NIKA2 Nose (entrance window, temperature screen behind, M7 & M8 mirrors unit).
- Slide all cryostat main body screens to the position were the nose was to access the 100 mK mount (aka "Robot Dog") on which all cold elements are mounted (dichroic, lenses, arrays...). Be extra careful with super insulator.
- Change 1mm arrays
- Change of cryo lenses
- Change dichroic
- Slide all cryostat main body screens back in place
- Put back the M7-M8 unit, take care of the long tie rods in order to get the best possible alignment of the cryostat optics (important not only to get the optical axis of the whole system aligned with the center of the arrays so that without Nasmyth correction the image of the point source is at the center of the arrays, but more importantly to get the pupils well aligned so that the illumination of M1 from the cryostat optics is well centered, otherwise we would pickup some warm spillover from the background behind the telescope, degrading the signal to noise (sensitivity) and the beam shape quality).
- While putting back the nose screen one by one, change IR-blocking filters mounted on them
- March 11th - 17th: NIKA2 cooling down (maybe start already on the 9th if we are as efficient as we hope for the preceding operations)
Once cool down has been started: check the optical alignment using the elevation axis lasers, and possibly the cryostat laser plate to be placed on the entrance window.
March 18th: Once the cryostat is cold, that KID traces can be displayed on the acquisition software GUI, and that the telescope can point a blank sky in good atmosphere conditions perform a radio alignment (has to be done by the team on site during the Mar 18th-25th week; see the re-commissioning preparation page, which contain a detailed description of the radio alignment procedure)
For more details on the optical and radio alignments with NIKA2 check the following link: History of optical and_radio alignments of NIKA2; this document (which is also available from the NIKA2 wiki main page) contains drawings that help understanding the procedures.
Detailed operations
Not sure it makes sense to describe all the operations the team will perform in details. This would be quite cumbersome and not necessarily super useful.