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Back to the NIKA2 Run 74 main page
Contents
NIKA2 Re-Commissioning (3rd. attempt)
NIKA2 run 74, Cryo run 86
Infos about the PIIC DAFs for the PIIC monitor
According to the results obtained from processing data of June 2025 NIKA2 re-commissioning given here, DAFs RPP scheme used during run 73 is kept. Therefore, two different sets of DAFs for Ar1+3 and for Ar2 are used. In practice:
- Ar2
- open a terminal, go to the QL directory
- gagpiic
- export MOPSIC_DAFS=/local/users/flexible/reduce/dafs_bck/dafs_local_tmp_run73_ar2
- start the Ar2 monitor (pf)
- repeat in another terminal for the Ar2 monitor(m)
- Ar1 and Ar3
- open a new terminal, go to the QL directory
- gagpiic
echo $MOPSIC_DAFS -> check that it says /sw/gildas/mopsic/dafs
- if not, then set it to that directory
- proceed normally with the Ar1 and Ar3 monitors
July 12-13, 2025
These tests are being carried out in the framework of the first Heterodyne pool week of Summer 25. Thanks to all involved for their comprehension.
Albrecht (AoD) and Angel at the telescope. Operators on Duty: Gloria (night) and Kike. Cryostat ok (T_MC = 0.170 K, T_Still = 1.21 K, T_4K = 8.37 K).
DAQ started with the window closed for sampling some instrumental noise traces. Bad KIDs (Ar1/Ar2/Ar3): 12, 5, 14. Screenshots of noise traces, in that order:
23:45 (LT): Starting NIKA2 session. Window open, clear sky, tau_225GHz ~ 0.23, mild wind. DAQ restarted (total power), bad KIDs: (Ar1/Ar2/Ar3): 13/953, 5/578, 29/1000.
The first task is to obtain reliable focus corrections per array. Pointing on 1741-038 (1.61 Jy @ 1 mm, 30 days average until 10/7/2025: SMA). An issue arises: adopting MOPSIC_DAFS=/local/users/flexible/reduce/dafs_bck/dafs_local_tmp_run73_ar2 for PIIC-QL as established above, a message synchro problem or corrupted file appears. Everything goes fine with that in the case of Ar1/Ar3. 2mm-PIIC monitors restarted using MOPSIC_DAFS=/sw/gildas/mopsic/dafs: now it works. We continue on this. On the other hand, it was not possible to activate the creation of imbfits files with the old system. Albrecht is investigating possible issues with the NCS libraries.
- Very stable atmosphere: p2p vars. in the second focus sequence of the session are ~ 2, 3, and 5 Jy/beam (ar1, ar2, ar3). Quiet residual background in the QL maps.
00:50 (LT): Changed to 1749+096 (2.33 Jy @ 1 mm, 30 days average until 09/7/2025: SMA) for new focus corrections.
12/7/2025 (UT) focus sequences (total power) |
||||||
Scans |
Target |
Start El. [deg] |
Ar2 |
Ar1 |
Ar3 |
Notes |
268 - 271 |
1741-038 |
48.8 |
1.29 |
* |
* |
Bad range for Ar1/Ar3 focus corrections |
274 - 277 |
1741-038 |
49.1 |
1.16 |
1.62 |
1.94* |
Much better. Pivot should be Ar2 focus correction + 0.6 mm to have reasonable fits for all arrays per single focus sequence; not so good correction for Ar3 |
280 - 283 |
1741-038 |
49.1 |
1.15 |
1.54 |
1.76 |
Even better |
286 - 289 |
1749+096 |
62.4 |
1.0 |
1.61 |
1.78 |
Good focus in general; maybe the telescope needs to relax a little more. |
300 - 002 |
1749+096 |
57.6 |
1.05 |
1.47 |
1.75 |
|
01:15 (LT): Starting a first trial of flux calibrations on secondary standards:
calib_1scan maps - Total power - 12/7/2025 |
|||
Scan |
Target |
Elevation |
Notes |
292 |
MWC349 |
66.3 |
focus opt. ar2 |
293 |
MWC349 |
67.3 |
focus opt. ar1/3 |
294 |
NGC7027 |
61.9 |
focus opt. ar1/3 |
295 |
NGC7027 |
62.9 |
focus opt. ar2 |
296 |
CRL2688 |
64.3 |
focus opt. ar2 |
297 |
CRL2688 |
65.3 |
focus opt. ar1/3 |
02:13 (LT): Starting a second trial of flux calibrations on secondary standards after a new focus correction on 1749+096:
calib_1scan maps - Total power - 13/7/2025 |
|||
Scan |
Target |
Elevation |
Notes |
5 |
MWC349 |
77.7 |
focus opt. ar2 |
6 |
MWC349 |
78.6 |
focus opt. ar1/3 |
7 |
NGC7027 |
72.9 |
focus opt. ar1/3 |
8 |
NGC7027 |
73.9 |
focus opt. ar2 |
9 |
CRL2688 |
76.2 |
focus opt. ar2 |
10 |
CRL2688 |
76.3 |
focus opt. ar1/3 |
Calib_1scan maps with no apparent problems. Comparable to those obtained last April, for instance.
AB: the completion of the last part of this report is in progress
13/7/2025 (UT) focus sequences (total power) |
||||||
Scans |
Target |
Start El. [deg] |
Ar2 |
Ar1 |
Ar3 |
Notes |
13 - 17 |
2251+158 (3C454) |
47.6 |
0.87 |
* |
1.64 |
No fitting for ar1; repeating after change pivot for a best fitting in all arrays |
18 - 22 |
2251+158 (3C454) |
49.8 |
0.97 |
* |
* |
No fitting for ar1, bad fit for ar3 |
27 - 31 |
2251+158 (3C454) |
55.41 |
1.17 |
* |
* |
No fitting for ar1, bad fit for ar3 |
33 - 37 |
2230+114 |
57.7 |
1.15 |
* |
* |
No fitting for ar1, bad fit for ar3 |
39 - 42 |
2230+114 |
59.4 |
1.17 |
1.60 |
1.83 |
Finally, a reasonable focus correction |
50 - 54 |
Neptune |
47.8 |
1.24 |
* |
* |
No fit for ar1, bad fit for ar3 |
60 - 64 |
2134+004 |
46.6 |
1.45 |
* |
* |
Marginal fit for ar1/3; changing to the appropriate pivot. Repeating. |
65 - 69 |
2134+004 |
44.9 |
1.55 |
2.0 |
* |
Marginal fit for ar3. Unreliable fits. |
72 - 76 |
2134+004 |
59.4 |
1.55 |
2.0 |
* |
Marginal fit for ar3. Unreliable fits. |