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October 10, (Monday)

October 9, (Sunday)

October 8, (Saturday)

20161008_Adjusting_PT_head_attach_on_cryo.JPG 20161008_PT_bolts_adjustment_1.JPG 20161008_PT_bolts_adjustment_2.JPG

October 7, (Friday)

October 6, (Thursday)

Till scan 21 (Oct 7), everything looked coherent except that the signal on quasars seemed unexpectedly faint (but we might know why now, see explanation next day). After several scans with no source on the cross scans: re-focus and point on Uranus, things seemed in OK, so back to a strong quasar (scan 33). The source was 20 degree higher than the previous source in elevation: so as expected the position of the source rotated on the map (since the new ref pix is away from the center of rotation which is defined by the current pointing model, which itself was calculated for another ref pix during run 3). This explains why the fit was not correct on the cross: the kid ref passed on the side of the source in azimuth. Unfortunately for the observers it was a nkpointb for which the map fit on array 1 was bad also. They didn't though about or dare using the fit of the other arrays that were in fact correct. Changing manually the pointing offsets with various tries can't work. The next shift tried to pursue a bit pointing tries, but finally gave up and concentrated on skydip, beammap focus. After investigation the next day, all the session makes sense in terms of pointing values observed on the various scans; the offset of the ref pix with respect to the rotation axis and the fact that many pointing scans looked too faint brought confusion among some of us.

October 5, (Wednesday)

October 4, (Tuesday)


October 3, (Monday)


It is clear that the noise we got in NIKA2 is well comparable.

October 2, (Sunday)

noise_2mm_all_ref.png Before noise_2mm_all_p025.png After regulation of the PT position noise_2mm_all_p025_opt.png After optimisation of the detectors

October 1, (Saturday)


September 30, (Friday)

September 26, (Monday)

On the box L, we identify clearly the two populations of resonances: the illuminated and those in dark (dark array in series). See figure below, showing the 1/f of the atmosphere on the illuminated KID, and much less in the dark. The "much less" will be electronics of residual illumination ?


The good news is that the dark array doesn't seem to affect the performance of that box.

September 25, (Sunday)


maps_focus_otf_20160925s331.png plot_20160925s331.png

kidpar_20160925s333_334_335_v0.png kidpar_20160925s468_469_470_v0.png


* We had a second session tonight, a few problems with files at the beginning but Juan and Alain solved the problem. The 2mm is better tuned than this afternoon. We made a few observations on Neptune, including a beammap and then moved to Uranus to perform another beammap in particular. We'll end the session by a short observation of MWC349 or a another calibrator to see if we already have hints on the FWHM difference between planets and less bright sources like we saw in the previous run.

September 24, (Saturday)

* 13h30. Start condensation.

* 17h. Cold enough for us to check the feedlines. ALL THE 20 ARE CONNECTED !!!! Finally good news. However, we still wait to see which temperature the cryostat will reach. So far around 1.1K, still condensing the mixture in the trap.

* 20h. The small traps got blocked immediately. I switch to the big one. I have connected all the 40 cables on the cryostat.

* 22h. The good news is that the cryostat reached 300mK (still at 1.2K), enough to see the resonances and probably to acquire a geometry tomorrow. I try before the night to pump the helium remained trapped in the small trap that is blocked but not entirely. Done at 22h25, I re-condense the 50 mbars of mixture that are back into the reserve.

September 23, (Friday)

September 22, (Thursday)

September 21, (Wednesday)

September 20, (Tuesday)

September 19, (Monday)

September 2016, 18 (Sunday)

September 2016, 17 (Saturday)

September 2016, 16 (Friday)

(added by SL on Oct 2019: the window was not changed because the AR coated one had crippling defects; we kept the smooth window.)

September 2016, 15 (Thursday)

DailyReportsNika2Run5 (last edited 2019-10-29 10:44:25 by NikaBolometer)