1. Status
DETECTORS:
We have a first baseline array (144 pixels) at 2mm. Average sensitivity: 6mK/Hz0.5 (1Hz)
Without de-correlation. In 2009 it was roughly 20mK before decorrelation.
We have a first array at 1.25mm (Roma-Trento) to test. And others at 2mm.
Begin of August foreseen test on first SRON array at 1.25mm
Working to improve the 2mm IRAM-Néel 2mm array (e.g. cross-talk, thickness, HF, film)
Best pixels tested had 2.7mK/Hz0.5 (1Hz), before de-correlation.
- DECORRELATION IS PRIORITY (by eye we see a correlation)
OPTICS:
Dual-band OK (for now no corrugated lenses and HDPE first lens)
Polarizer should arrive this week or the next
Still waiting one last HPE filter with the good diameter (should arrive)
Background seems lower with the new optics (40K vs. 70K equivalent). A confirmer cet aprèm.
ELECTRONICS:
- ROACH board 64 channels version working (up to 220MHz band) (Alain DDC program)
DDC program should work for 100 pixels
ROACH board FFT program almost done (Loren)
LPSC electronics will be available too for October (128 ch. but only 120MHz band)
The NIKA FFTS Bonn box never arrived
Andrey working on another electronics (purely commercial, 1GHz band)

2. For 6mK difference T on focal plane we calculate (assuming 0
For 6mK difference T on focal plane we calculate (assuming 0.35 instrument
Transmission and GHz band) 5.5·10-16 W difference per pixel (2.25x2.25mm)
DECORRELATION VERY IMPORTANT.

3. 3-6dB deep  coupling OK
Problem. 2-3 resonances lost.
Process : IRAM (sputtering), 30nm, HR silicon, 300um thick. Design : NICA 5a

4. FWHM = 28mm (??? Typical 20 ??)
S/N on the « planet » = 3000 Hz0.5
Assuming T=20K (200K of 8mm
diameter planet diluted over 28mm
beam), means
20K/3000  7mK/Hz0.5
 consistent with Sky simulator
estimation

5. TELESCOPE
FOCAL PLANE
TELESCOPE
LABORATORY
620 mm