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| = Detectors information = | |
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| [[Nika2Run5|Back to the NIKA2 Run 5 main page]] <<BR>> [[Nika2Run6|Back to the NIKA2 Run 6 main page]] |
The document below in attached aims at giving the guidelines for the next commissioning phase of NIKA2 concerning the polarization channel. It is based on the experience we gained with NIKA and lists technical tests to be done and observational sources, which will be of interest for both the instrumental polarization characterization and the calibration of angle and degree of polarization. |
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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". {{attachment:1mmHspectrum.jpg||height=415}} <<BR>> ---- === 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.. {{attachment:2mmnewspec.jpg||height=415}} [[NIKA2_commissioning_polar.pdf|NIKA2_polarization_commissioning_guidelines]] |
[[attachment:nika2_polar_commissioning.pdf]] |
NIKA2 polarization run preparation notes
The document below in attached aims at giving the guidelines for the next commissioning phase of NIKA2 concerning the polarization channel. It is based on the experience we gained with NIKA and lists technical tests to be done and observational sources, which will be of interest for both the instrumental polarization characterization and the calibration of angle and degree of polarization.