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Status. DETECTORS: Baseline for 2mm: NICA 5a (144 pixels, IRAM, 30nm sputtering); average sensitivity: 6mK/Hz 0.5 (1Hz) corresponding roughly to NEP  6 · 10 -16 W/Hz 0.5 (1Hz). Before de-correlation. Tested one array made in Trento/Roma for 2mm. Found about 12mK/Hz 0.5 (1Hz).

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  1. Status • DETECTORS: • 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: 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 in • Sensitivity. Improvements ongoing on both sides. Time until first week of October for testing. • 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: • - 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)

  2. Summary • WE THINK A SHORT TECHNICAL RUN (5x12h) AT THE 30-m IS JUSTIFIED BY : • - IMPROVEMENT on 2mm BAND sensitivity (factor estimated in 24) • - NEW 1.25mm BAND (simultaneous !) • - LARGER NUMBER OF PIXELS (> 3 times more than last year) • 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 • ………………….

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

  4. NICA 5a BEAM FWHM = 28mm 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. OPTICAL CONFIGURATIONS TELESCOPE FOCAL PLANE TELESCOPE LABORATORY 620 mm

  6. 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.

  7. 132 pixels, 2mm array. Al box (could not be a good idea) Resonances spacing : 2MHz or less SRON 256 pixels array. Resonances Spacing : 4MHz

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