Friday 14th February 2014
Xavier and Alessandro arrive at the telescope. Made a new parameter file FOR THE 2MM array ONLY (definitely need the sky for the 1mm).
Old configuration (2mm): DAC gains: 20-23-20-28-35. General niveau: 5.
New configuration (2mm): DAC gains: 20-23-20-38-55. General niveau: 5. Pixels 17-25: niv 6. Pixels 55 to 56: niv 6. Pixels 73 to 78: niv 4. Pixels 96 to 108: niv 6.
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Figure. Left: old config, right: new config. MADE WITH WINDOW ON CRYOSTAT, TO BE CONFIRMED (see tomorrow) WITH LN2. DON'T USE THIS BRAIN!!
Strong (strange) 12Hz noise on some (e.g. 4-5) pixels.
Saturday 15th February 2014
8h00. Theoretical start of the run. Winds peaking at 40m/s, telescope stopped probably the whole morning. The ski station is closed due to the wind.
9h00. LN2 in front of the cryostat window to play at least with the resonances. "Decalage" found by the new "restore tones" is good. -22kHz and -1KHz at 1 and 2mm respectively, indicating that the param file run8.txt is well representative of LN2 temperature.
13h00. Wind hits 42m/s (150km/h). The telescope basement is a block of ice. Put again the window on the cryostat, "restore tones" works very well. Found a shift of -393kHz and 100kHz.