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== December 7, (Wednesday) == Alain fixed a few issues during the night. I'll let him explain in details, I think he already did it by emails to the relevant people. He also performed an alignment test by moving a sheet of ecosorb in front of the entrance window and found that there indeed was a problem of alignment. by a few millimeters. This will probably be the first thing we address this afternoon when we take the antenna. |
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December 6, (Tuesday)
Alain, Johannes, Nicolas, Frédéric, Jean-François, Andrew, and Samuel arrived at the telescope.
Alain, Johannes Samuel with the help of Dave and Gregorio spent most of the day in the cabin, installing and testing the new external calibrator. Installation on a horizontal bar fixed in the vertex cabin (between M2 and M3 after passing the M1 vertex). We tested it using the EMIR receiver, plugged on a spectrum analyser. After solving some minor problem it worked. We also changed the synthesizer of the 2mm band (a new generation with an option that caused us some trouble in the previous run) with an older one that Alain brought in his baggages. Nico worked on the Pipeline. Alessandro and Martino took care of the cryostat remotely (need to warm up a bit to take care of a blockage in the dilution unit, then cool down again). We foresee to reach the base temperature near 2am. In the mean time we make a better characterization of the calibrator using the EMIR receiver with its FTS backend: we take the spectra for each of the line emitted by the calibrator (139.5 GHz, 155 GHz, 170.5 GHz, etc.).
December 7, (Wednesday)
Alain fixed a few issues during the night. I'll let him explain in details, I think he already did it by emails to the relevant people. He also performed an alignment test by moving a sheet of ecosorb in front of the entrance window and found that there indeed was a problem of alignment. by a few millimeters. This will probably be the first thing we address this afternoon when we take the antenna.