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== January 12, (Thursday) == Quiet this morning. We leave in the afternoon. |
Back to the NIKA2 run 8 main page
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.
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 12, (Thursday)
Quiet this morning. We leave in the afternoon.