StatusDETECTORS:DETECTORS:-Baseline for 2mm:Baseline for 2mm: NICA 5a (144 pixels, IRAM, 30nm sputtering); average sensitivity: 6mK/Hz0.5 (1Hz) corresponding roughly to NEP 6·10-16 W/Hz0.5 (1Hz). Before de-correlation.- Tested one array made in Trento/Roma for 2mm. Found about 12mK/Hz0.5 (1Hz).- Still 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.- Baseline for 1.25mm:Baseline for 1.25mm: SRON (IRAM, 30nm sputtering); average sensitivity: 50mK/Hz0.5 (1Hz)NEP 8·10-15 W/Hz0.5 (1Hz). PRELIMINARY. Imaging OK. Resonances OK.- Tested one LEKID array made in Trento/Roma for 1.25mm. Found about 30mK/Hz0.5 (1Hz) but some problems with resonances (coupling not adapted).- As agreed, the priority is for the SRON array if the Roma/Trento one isn’t 2.5 times better inSensitivity. Improvements ongoing on both sides. Time until first week of October for testing.

OPTICS:OPTICS:- Full dual-band tested last week.- Polarizer not flat at 300K but imaging seems OK (full system test 25/08/2010)- Still waiting one last HPE filter with the good diameter (should arrive)- Background seems lower with the new optics (40K vs. 70K equivalent).

ELECTRONICS:ELECTRONICS:- ROACH board 112 channels version working (up to 220MHz band) (DDC program)- ROACH board FFT program is also working (Loren)- LPSC electronics available and to e tested in September (128 channels over 125MHz band)- Andrey working on another electronics (FFTS, 1GHz band)

Summary

- WE THINK A SHORT TECHNICAL RUN (5x12h) AT THE 30-m IS JUSTIFIED BY :WE THINK A SHORT TECHNICAL RUN (5x12h) AT THE 30-m IS JUSTIFIED BY :

- IMPROVEMENT on 2mm BAND sensitivity (factor estimated in 24)- NEW 1.25mm BAND (simultaneous !)- LARGER NUMBER OF PIXELS (> 3 times more than last year)

- IF ACCEPTED WE WOULD NEED :IF ACCEPTED WE WOULD NEED :- 8 dewars of helium (we’re carrying 2 more from Grenoble)- more information on receiver cabin dimensions- to check again that the Ethernet cable from the cabin is OK- ………………….

Problem. 2-3 resonances lost.

3-6dB deep coupling OK

Process : IRAM (sputtering), 30nm, HR silicon, 300um thick. Design : NICA 5a

NICA 5aNICA 5a

FWHM = 28mm

S/N on the « planet » = 3000 Hz0.5

Assuming T=20K (200K of 8mmdiameter planet diluted over 28mmbeam), means

20K/3000 7mK/Hz0.5

consistent with Sky simulator estimation

NICA 5a BEAMNICA 5a BEAM

TELESCOPE

LABORATORY

620 mm

TELESCOPEFOCAL PLANE OPTICAL CONFIGURATIONSOPTICAL CONFIGURATIONS

For 6mK difference T on focal plane we calculate (assuming 0.35 instrument Transmission and 130-165GHz band) 5.5·10-16 W difference per pixel (2.25x2.25mm)

DECORRELATION VERY IMPORTANT.DECORRELATION VERY IMPORTANT.

132 pixels, 2mm array.Al box (could not be a good idea)Resonances spacing : 2MHz or less

SRON 256 pixels array.

Resonances Spacing : 4MHz