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== January 2016, 14 (Wednesday) == 01h30. We go to the sky. Telescope staring at EL = 43 deg under tau = 0.2-0.25 and good conditions in stability. The noise on the sky seems OK (say great) on the arrays 1 (1mm NIKEL RF) and 2 (2mm). Worse on array 3 (1mm NIKEL DC). {{attachment:2mmnoisesky.png||height=480}} {{attachment:1mm1noisesky.png||height=480}} {{attachment:1mm3noisesky.png||height=480}} '''Figure.''' Noise on the sky on respectively the 2mm, 1mm NIKEL_RF (array 1) and 1mm NIKEL_DC (array 3). |
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January 2016, 14 (Wednesday)
01h30. We go to the sky. Telescope staring at EL = 43 deg under tau = 0.2-0.25 and good conditions in stability.
The noise on the sky seems OK (say great) on the arrays 1 (1mm NIKEL RF) and 2 (2mm). Worse on array 3 (1mm NIKEL DC).
Figure. Noise on the sky on respectively the 2mm, 1mm NIKEL_RF (array 1) and 1mm NIKEL_DC (array 3).
January 2016, 13 (Wednesday)
19h30. NIKA2 HAS ALL THE 20 LINES CONNECTED AND ALL WITH RESONANCES. WE ENTERED THE 3000 PIXELS ERA.
THE NOISE (with the window) seems OK. On three random lines over the three arrays I see on average 1Hz/sqrt(Hz) (2mm), 2Hz/sqrt(Hz) (1mm, NIKEL_RF) and 2.5Hz/sqrt(Hz) (1mm, NIKEL_DC). Very flat on the 2mm one, a bit less on the 1mm ones. Still no traces of the pulse tube. I think that the difference between the noise on the NIKEL_Rf and the NIKEL_DC can be explained with the modulation. The nominal 10kHz modulation on the NIKEL_RF are in reality 6.5kHz, while on the other RF source attached to the NIKEL_DC we have 9.5kHz. Or viceversa. So the RF_dIdQ is calculated a bit differently. So my conclusion is that most probably there is no real difference between the two configurations.
Figure. Noise with the window on respectively the 2mm, 1mm NIKEL_RF (array 1) and 1mm NIKEL_DC (array 3)
Figure. Left: trace of the 1140 pixels of array 3; right: monitor with all the 20 boards tuned.
Next step on the sky at 2am to check resonances shape.
January 2016, 12 (Tuesday)
- Olivier, Alessandro and Florian arrived at the telescope.
The new boards installed and connected
Array 1 (1mm - IN-OUT 5-12): NIKEL_RF (192.168.1.150)
Array 2 (2mm - IN-OUT 1-4): NIKEL_USB (192.168.1.221-24)
Array 3 (1mm - IN-OUT 13/20): NIKEL_DC (192.168.1.170)