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21:00 - 03:00; Matthieu: The night started by calibration on Uranus (pointing, focus, calib1_scan [20220118s193], beammap [20220118s194]) and then a skydip [20220118s195]. Then, WB89-789 (137-21) was observed. The operator (Sergio) mentioned a problem with an antenna temperature control. I redid a focus and it was off by almost 2mm. We managed to get a good focus and started to observe COSMOS (192-16). I did a control pointing and realize that the beam was VERY bad (40 arcsec). The operator then changed the temperature control mode. Around 1h30, I redid a focus (hard to find since it moved again a lot) and started to observe COSMOS. I redid a focus and pointing after 30 min and it did not drift too much. I then started a 1h integration on COSMOS to finish the shift. The weather was excellent (tau~0.15). So, it was very unfortunate to have these technical problems, but Sergio was super efficient to fix it. |
Daily Reports
Contents
Jan 18th, Tuesday
16:00-21:00; Ioannis: System check begins directly after maintenance around 16:30. NIKA2 acquisition is restarted. After few trials we get a good tuning with 42/5/48 dead kids for Arr1/Arr2/Arr3. The correlated noise in the traces of Arr1 is still visible at 2.6, 5.5 and 8 Hz. We start with very good weather conditions (tau225 ~ 0.15 and baseline variations of 0.5-1 Jy/beam at 2mm) and do pointing and focus on Uranus (beam size 17.7" at 2mm and best focus -1.3mm). Manuel adjusts parameters P2 and P7 of the pointing model and I start a short pointing session with 16 sources that cover an azimuth range of 120-289 degrees and elevation range of 10-73 degrees. The results yield an azimuth correction of 1.81" +/- 1.99" and an elevation correction of -6.29" +/- 1.28". Given the large offset from (0,0) we readjust parameter P2 and run a second short pointing session with 11 sources that cover an azimuth range of 120-283 degrees and elevation range of 27-70 degrees. The final results yield an azimuth correction of 1.13" +/- 0.99" and an elevation correction of 0.47" +/- 1.56" and we decide to keep this settings for the ongoing pool week. The shift is finished with a retuning of NIKA2 in preparation for the night shifts. After few trials we get a good tuning with 38/8/48 dead kids for Arr1/Arr2/Arr3. Throughout the shift tau225 was below 0.2 and the baseline stability was between 0.3 and 4 Jy/beam at 2mm.
21:00 - 03:00; Matthieu: The night started by calibration on Uranus (pointing, focus, calib1_scan [20220118s193], beammap [20220118s194]) and then a skydip [20220118s195]. Then, WB89-789 (137-21) was observed. The operator (Sergio) mentioned a problem with an antenna temperature control. I redid a focus and it was off by almost 2mm. We managed to get a good focus and started to observe COSMOS (192-16). I did a control pointing and realize that the beam was VERY bad (40 arcsec). The operator then changed the temperature control mode. Around 1h30, I redid a focus (hard to find since it moved again a lot) and started to observe COSMOS. I redid a focus and pointing after 30 min and it did not drift too much. I then started a 1h integration on COSMOS to finish the shift. The weather was excellent (tau~0.15). So, it was very unfortunate to have these technical problems, but Sergio was super efficient to fix it.
Jan 19th, Wednesday
Jan 20th, Thursday
Jan 21st, Friday
Jan 22nd, Saturday
Jan 23rd, Sunday
Jan 24th, Monday