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Size: 4122
Comment:
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Size: 4287
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 36: | Line 36: |
| || || || || || || start at +0.6 mm || || || || || || || || |
|| 167-171 || 2251+158 || ~0.0 || 0.9 || ~1.1 || start at +0.6 mm; Ar2 and Ar3 based on FWHM; El~40 deg; Ar2 FWHM and flux criteria do not agree || || 172-176 || 2251+158 || || || || start at +0.7; custom script with 0.5 mm step instead of 0.4 mm; || |
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NIKA2 Re-Commissioning (4th. attempt)
NIKA2 run 75, Cryo run 87
Oct. 13, 2025
14:00-17:00; Martino, Alessandro, Dave, Angel: a new sweep was performed. Previous initialization file: run87_old.ini. Bad/total KIDs counts (cryo window closed) after sweep (Ar1, Ar2, Ar3): 9/1000, 8/574, 4/1013. New file in force: run87_new.ini. Files run87_new_tp.ini and run87_new_pol.ini were also created. See nika2-a:~/nika_V3_IRAM.ini.
Oct. 14, 2025
We rename the ini files:
run87.ini (active file)
run87_old.ini (OLD active file, not used in August)
run87_newSweep_tp.ini
run87_newSweep_pol.ini
run87_oldSweep_tp.ini
run87_oldSweep_pol.ini
@15:00 LT we start, after preparing the whole "NIKA2 week environment architecture: 15/8/55 lost KIDs in Ar 1,2,3. Unstable sky and thick clouds coming from the N. We're entering in the peak of the tau forecast. It will be better later this evening. Meanwhile we try to focus. The old make-imbf script does not produce the imbfits files. Angel contacts Albrecht to solve the issue. The new make-imbf produces the file regularly.
On the very variable thick clouds, we notice a very different response of Ar1 and Ar3 to sky noise (variations), the latter having a bkg few times higher than the former (compare the y-axis scales). Is it real? Is there a flux calibration problem in the old DAFs? The a posteriori (19:00 LT) check does not reveal any calibration issue: Ar1 and Ar3 give similar fluxes for the targeted sources.
While we wait, some checks to some Antenna temperature control cables are being carried out by the telescope team. We start again 18:45 LT. The old make-imbf is now producing files correctly (thanks Albrecht!)
Focus sequences
Scan nr
Target
Ar2
Ar1
Ar3
Notes
20251013s161-165
2251+158
-0.3
+0.3
...
start at +0.2 mm; Big jumps in FWHM and flux during the focus sequence in Ar2
167-171
2251+158
~0.0
0.9
~1.1
start at +0.6 mm; Ar2 and Ar3 based on FWHM; El~40 deg; Ar2 FWHM and flux criteria do not agree
172-176
2251+158
start at +0.7; custom script with 0.5 mm step instead of 0.4 mm;
Beam maps
Scan Nr
Target
Focus
Notes
Calibrators
Scan Nr
Target
Focus
Notes
Scan Nr
Target
Focus
Notes