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Back to the NIKA2 run 8 main page

January 24, (Tuesday)

Laurence and Andrea arrived at the telescope.

- First, we performed the alignment of the projection of the cold pupil in the NIKA2 window by using the slab eccosorb as Alain and Samuel did during the previous campaign. We found that the cold pupil was misaligned on the window by 5 mm horizontally (in the direction of the wall) and 1.5 mm (in the direction of the roof). - Then we removed the M3 mirror using the telescope laser on the elevation axis, we tilted the M6 mirror for having the laser spot on the window in the same position of the centre of the pupil.

We see the pulse tube as usual after opening the cryostat. It does not seem to generate a noise that can bother us during the beam map so we decided to observe in this configuration. Tomorrow morning we will try to fix the problem.

noise1mm_window.png

January 11, (Wednesday)

We have added the security gauge before the oil trap in the primary pump. It is called P7, to be compared to P3 (after the oil trap). All the securities are now based on P7 instead of P3.

We have connected the ventilator of the HP400 turbo pump directly to the HP400 power supply (in the cryostat electronics armoire in the cabin), so they switch on and off together.

We have connected the orange vacuum pump in the spiral room (the pump we had used after the failure) to the automation of the GHS. So now this pump can be controlled remotely.

Fixed problems with the config of the automate.

We have cleaned the cabin, the NIKA2 space.

We have replaced (see ELOG) two boards in racks 1 and 2 (IP 152 and IP 162 respectively). We have identified a strange behaviour of rack 3 (last board but also slot 4, again see ELOG).

Launched the cool-down in the afternoon. The still thermometer has the usual problems. Probably related to the MMR3.


January 10, (Tuesday)

Alain, Alessandro and Andrea arrived at the telescope.

We have opened/closed the cryostat. Nothing particularly wrong was evident. We have changed the lenses "front of array" on arrays 1 and 3. Checked that the filter in front of array 1 was in good shape. The polariser and the dichroic were flat. We have checked the height of the 50K mirrors block compared to the 300K window. The 50K was 5mm too high (means the tie-rods too tightened). Now they are both aligned (the tie-rods were adjusted to get the good hight). With the tie-rods completely loosened we are at say, 0mm. The tie-rods completely tightened we are at 8mm. In our case we have adjusted the tie-rods to be at 3mm compared to "tie-rods loosened".

We have added super-insulation when needed. Cryostat closed and start pumping at 19h.

Again (like last time) we had a leak in the last ORing of the nose. Seems to be related to the "bride" that is not exactly flat. We would need a bigger-diameter ORring. We will order it.

We go to bed at 24h with no leaks.

DailyReportsNika2Run8 (last edited 2017-01-31 09:50:20 by RobertZylka)