Daily Reports (2025/10/21-28, NIKA2 run 75, Cryo run 87)
Observers on-site: Monica Rodriguez, Samuel Leclercq, Raphaël Maris, Stefano Berta and Stergios Amarantidis (AoD).
Operators: Sergio and Mario.
Shifts: 10-16 Raphaël; 16-22 Samuel; 22-4 Stefano; 4-10 Monica.
All times reported are in UTC (if not mentioned otherwise).
Preparatory notes
Please, remember to use the focus value of Ar1 (roughly Ar2 + 0.65 mm, but use directly the focus Ar1 monitor if possible). Please use the custom modified focus script focusOTF-Z_2025.pako.
Therefore, importantly, when checking the quality of the beam on a pointing map to decide if a new focus is needed, it is better to do it on the Ar1 map, because that's the one focused at best.
Project D01-25 (M51) requires DAQ restarting with the run87_newSweep_M51_tp.ini file. Come back to run87_neSweep_tp.ini after observing this project.
Please fill the Table with the Ar1,2,3 focus values as follows. At best, make one table per day.
Focus sequences
Scan nr
Target
Ar2
Ar1
Ar3
Notes
Similarly, if any beam maps are taken:
Beam maps (99 sub-scans)
Scan Nr
Target
Focus
Notes
October 21st, 2025, Tuesday
15:00-22:00 [All]: Maintenance finished with no issues. DAQ started at 14:10 with 21/3/47 bad KIDS for arrays 1,2 and 3, respectively. Repeating the DAQ at 14:24 with 28/3/89. Trying to point at NGC7027 and MWC349 but the weather is too unstable (p2p~10-20Jy/beam), moving to K3-50A for pointing and focus (using the modified 2025 script). Moving for calib_1scan to MWC349, etc. Switching to project 053-25 (source 1803+784 is better for pointing/focus). One repetition of L1157B. Around 17:12 we moved to a skydip and then to the normal flux calibrators. After pointing/focus on 1803+784 we move to project 022-25. Two repetitions of Ceph-4.
22:00-04:00 [Stefano]: here follows the evolution of the night:
- I let the 022-25 observations finish
- some difficulties in focusing properly, due to sky fluctuations combined with the big difference between Ar2 and Ar1
- 053-25 one repetition on L1157B (4 scans)
- calibrations (MWC349, CRL2688, NGC7027)
- 053-25 one more repetition on L1157B (4 scans)
- calibrations (Neptune, Uranus)
I decide not to take any beam maps on Uranus, because: a) the sky is not stable enough; b) in principle we'd need three beam maps, focused on each of the three NIKA2 arrays independently!
- @00:30 UT check in the cabin if anything is out of place, because NIKA2 is so unstable. All good. Nothing to report.
- some struggle to get a position with a decent stability, the wind is slowly rising and the humidity too.
- 066-25, one repetition of "M31-inner". tau(225) at start = 0.291.
Focus sequences of 2025/10/21
Scan nr
Target
Ar2
Ar1
Ar3
Notes
20251021s109-113
K3-50A
+0.10
+0.61
+0.80
Started at 1mm, custom script, array 2 out of range
114-118
K3-50A
+0.02
+0.60
+0.82
Started at 0.61mm, custom script
131-135
1803+784
...
+0.56
+0.75
Started at 0.6mm, custom script, array 2 out of range
147-151
1803+784
+0.15
+0.68 to +0.77
+1.00
Started at 0.56mm, custom script; focus set to 0.68
162-166
1803+784
+0.33
+1.10
...
Started at 0.8 mm, custom; Ar1 based on FWHM only; Ar3 out of range
167-171
1803+784
...
...
...
Started at 1.0mm; custom; problems with the new make-imbf of scan 171
172-176
1803+784
+0.16
+1.00
+1.24
Started at 1.0; custom; Ar2 not well determined; see Tapas for further interesting features of this sequence
187-191
MWC349
+0.45
+1.10
+1.25
Started at 1.0; custom; Ar3 not well sampled
208-211 + 20251022s1
Uranus
+0.45
+1.05
+1.18
Started at 1.1 mm; custom;
October 22nd, 2025, Wednesday
04:00-10:00 [Monica]: Pointing, Focus and calib_1 scan in Uranus. Then project 066-25 (Source M31_inner) for 1 hr (1 round), weather started to became very unstable in the last scan peak to peak variations > 50 Jy/beam (Ar2). Then pointing and focus in Uranus, then the opacity rise to 1.0, so we stopped ~ 50 minutes. Continue with pointing, focus, pointing and calib_1scan in Uranus and Alfori. Then observe project 082-25 (Source PSz2G107) 2 rounds (~ 2hr).
10:00-16:00 [Raphaël]: Pointing Focus on f source 1418+546. Then observe project 082-25 (Source PSZ2G107) 2 rounds (2 hr). Making Skydip. Starting D01-M51 source. Changed to 47 Hz sampling rate: 15/4/37 lost KIDs. Nothing so bright around our science target so we move to 1633+382 to focus. Then back to 1418+546 and then to the science target (observed 6 repetitions of M51).
- @11:15 UT, Jean fixes a problem in the make-imbf. Yesterday the new make-imbf did not produce the imbf files of scan 20251021s171. we ran it manually, but the result was flawed. Jean fixed the manual version of the new make-imbf, that was looking for the Antenna traces in the wrong location. Thank you! The initial issue (that the automatic version did not produce the s171 files) is under investigation.
16:00-22:00 [Samuel]: Tau values have increased above the threshold of the project D01-M51 (0.4) thus we move to calib_1scan observations with the higher sampling rate of project D01-25 and monitor the weather. Pointing on MWC349 with p2p~10Jy/b, repeating + focus. Weather seems to go better in fact: calib_1scan on MWC349 gives now p2p ~ +-5Jy/b and tau=0.37... same for CRL2688 and for NGC7027 --> weather stabilized below D01-25 limits, so we iterate more on it after all. Alas, the time to point on nearby point source and run the script weather evolved just above limits. Switch back to 23 Hz acquisition. After reloading frequencies and tune: bad pix = 30/5/123 for Arr 1/2/3. Lots of lost kid on Arr3 probably due to relatively high sky fluctuations now. But conditions still good enough for project 053-25, though with a little doubt regarding the stability, p2p still < +-10 Jy/b in pointing scans preceding the series of scans on L1157.
- Below, screenshot showing the difference of response to sky fluctuation between Arr1 and Arr3: Arr3 gets x3 higher p2p response than Arr1 besides identical calibrated value for the source! (see today's regular NIKA2 meeting for the discussion about this topic).
22:00-04:00 [Stefano]: Here follows th evolution of this shift:
- skydip and calibrations (MWC349, CRL2688, NGC7027, Neptune)
- 053-25 one repetition (4 scans) - taumeter variable, but good peak to peak variations
@22:15 UT. While observing, I am thinking again about the different behaviour of Ar1 and Ar3 in variable sky noise. Practical example: one scan can have Ar1 sky noise peak to peak variations of 10 Jy/beam, and the same scan, same sky, same time, has a peak to peak variation in Ar3 of 20 Jy/beam. I asked myself if this could be due to a problem of calibration in Ar3 or Ar1. Last week, I have checked the extracted fluxes (in the PIIC QL monitor on the fly at the telescope) for few pointing scans and did not find any factor of two difference. I will have to check again more systematically when I have time. Note, anyway, that the calibration factors for run 75 are not available yet (they'll be determined at the end of the run or of the semester, as usual). The calibration factor we're using are those of March-June, when the Ar3 RPPs/Kidpars were missing the majority of KIDs. Therefore anything is possible at this point.
Focus sequences of 2025/10/22
Scan nr
Target
Ar2
Ar1
Ar3
Notes
19-23
Uranus
0.5
1.25
1.84
Started at 1.03 mm Focus optimized for Ar1; custom script
35-39
Uranus
0.5
1.18
1.44
Started at 1.25 mm, focus optimized for Ar1; custom script
42-46
Uranus
+0.45
+1.19
+1.47
Started at 1.18 mm. optimized for Ar1; custom script
52-56
ALFORI
+033
+1.1
+1.32
Started at 1.19 mm optimized for Ar1; custom script
61-65
Uranus
+0.35
+1.12
+1.33
Started at 1.1 mm optimized for Ar1; custom script
81-85
1418+546
+0.19
+1.1
+1.3
Started at 1.12 mm optimized for Ar1; custom script
98-103
1418+546
+0.27
+0.76
...
6 scans on this focus; Started at 1.1 mm optimized for Ar1; custom script
104-108
1633+382
+0.24
+0.72
+0.9
Started at 1.10 mm optimized for Ar1; custom script
111-115
1633+382
...
+0.6
+0.9
Started at 0.70mm optimized for Ar1; custom script
116-120
1638+398
+0.1
+0.7
+0.95
Started at 0.62 mm optimized for Ar1; custom script
136-140
MWC349
0.0
+0.67
+0.95
Started at 0.70 mm optimized for Ar1; custom script
158-162
1803+784
+0.42
+1.07
+1.45
Started at 0.67 mm optimized for Ar1 from FWHM as peak looks suspicious (>2); custom script
163-167
1803+784
+0.4
+1.15
+1.4
Started at 1.07 mm optimized for Ar1; custom script
175-179
MWC349
+0.35
+1.00
+1.27
started at 1.10 mm; custom; Ar2 not fully covered
197-201
225+158
+0.30
+1.00
+1.27
started at 1.00 mm; custom
October 23rd, 2025, Thursday
04:00-10:00 [Monica]: ...
10:00-16:00 [Raphaël]: ...
16:00-22:00 [Samuel]: ...
22:00-04:00 [Stefano]: ...
Focus sequences
Scan nr
Target
Ar2
Ar1
Ar3
Notes
October 24th, 2025, Friday
04:00-10:00 [Monica]: ...
10:00-16:00 [Raphaël]: ...
16:00-22:00 [Samuel]: ...
22:00-04:00 [Stefano]: ...
Focus sequences
Scan nr
Target
Ar2
Ar1
Ar3
Notes
October 25th, 2025, Saturday
04:00-10:00 [Stergios]: ...
10:00-16:00 [Raphaël]: ...
16:00-22:00 [Samuel]: ...
22:00-04:00 [Stefano]: ...
Focus sequences
Scan nr
Target
Ar2
Ar1
Ar3
Notes
October 26th, 2025, Sunday
04:00-10:00 [Stergios]: ...
10:00-16:00 [Raphaël]: ...
16:00-22:00 [Samuel]: ...
22:00-04:00 [Stefano]: ...
Focus sequences
Scan nr
Target
Ar2
Ar1
Ar3
Notes
October 27th, 2025, Monday
04:00-10:00 [Stergios]: ...
10:00-16:00 [Raphaël]: ...
16:00-22:00 [Samuel]: ...
22:00-04:00 [Stefano]: ...
Focus sequences
Scan nr
Target
Ar2
Ar1
Ar3
Notes
October 28th, 2025, Tuesday
04:00-10:30 [Stergios]: ...
Focus sequences
Scan nr
Target
Ar2
Ar1
Ar3
Notes