Table 1
Characteristics of the NIKA instrument coupled to the IRAM telescope.
| 1.25 mm channel | 2.14 mm channel | |
|
|
||
| Pixel size [mm] | 1.6 | 2.3 |
| Dual polarization | yes | yes |
| Angular size (Fλ) | 0.9 | 0.79 |
| Beam efficiency [%] | 55 | 70 |
| Detector efficiency [%] | 80 | 80 |
| Overall optical efficiency [%] | 30 | 30 |
| Total background [pW] | 45 | 20 |
Notes. The total background is calculated per pixel with a contribution
of the atmosphere derived in good weather conditions. This corresponds to an expected
photon-noise level equal to about 
for the 2.14 mm channel and 
for the 1.25 mm channel. These parameters have a 50% precision level.
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