NIKA2 polarization run preparation notes

Detectors information

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REMEMBER: in the cryostat the polariser has horizontal wires. It means that the array 260GHz in transmission is sensitive to a polarisation vertical (E field vertical wrt the input window of the cryostat). The array 260GHz in reflection on the other hand is sensitive to a polarisation horizontal (E field horizontal wrt the input window of the cryostat).

260 GHz band H (reflection) "array 1"

Array: 1mm_MSv1_02 - Al 18nm PTA

Pixels: 1140 pixels 2x2mm

Cold electronics: 8 amplifiers TTI Norte 2-3GHz (192.168.1.92, IN/OUT 5-12, E-F-G......L)

Warm electronics: "NIKA1" AMC rack, equipped with 8 cards, (synthesizer 2, 192.168.1.192, +10dBm), LO = 1.885GHz

Optics and spectrum: HDPE window and lenses with AR coating made with "pyramidal corrugations".

150 GHz band

Array: 2mm_MSv0_02 (tested in run N1.5_030)

Pixels: 616 pixels, 2.75x2.75mm

Cold electronics: 4 Yebes L-band (1.2-1.8GHz) modified InP on channels 1,2 and 4. A classical L-band GaAs on channel 3. Controller amplis 192.168.1.93, IN/OUT 5-12, E-F-G......L

Warm electronics: "NIKA2" AMC rack, equipped with 4 cards, (synthesizer 8, 192.168.1.198, +7dBm), LO = 0.945GHz

Optics and spectrum: HDPE window and lenses with AR coating made with "pyramidal corrugations". New air-gap dichroic (flat). The spectrum is relatively flat between 145 and 165 GHz and has FWHM=130-170GHz. The central frequency is comprised between 150 and 155 GHz. WARNING: this spectrum measured in NIKA1.5 equipped with the same band-defining filter stack. However, the high-frequency filters and the lenses are not the same. We had no choice, NIKA2 was already gone..

NIKA2_polarization_commissioning_guidelines