Preparation visit before Run6
In May 2013, 3 people come to the 30m to install the new 2mm array and replace the 1mm cold amplifier. Then, a cooling down will occur and the NIKA prototype stays cold until the Run6 proper starts.
Plan
Tuesday 14-May-2013: 10h (during maintenance) Open cryostat, replace array at 2mm and the 1mm cold amplifier. Install the new DC cables for the amplifier. Install a new 4K magnetic screen. Install electronics rack in the cabin and connect. Mount the anti-vibration legs on the pumping stage. In the evening, start cooling down.
15-17 May 2013: cooling down
18 May 2013: check resonances in a dark configuration and end the preparation as soon as it is ready. The cryostat stays cold until the observational run 6 in June.
Alessandro Monfardini, Martino Calvo and Nello D'Addabbo come by car from Grenoble.
Report
Tuesday 14-May-2013: All planned operation completed. Furthermore, mu-metal screening on 4K and 50K stages:
- on 4K screen: (inner) METGLAS 2714A 2.0 inch x 0.6 mil std spec (bat), mu about 10000 @ 4K; (outer) VITROVAC (same put on Sionludi @ Institu Néel)
- on 50K screen: only METGLAS
Cooling down started at 17:30.