2015/08/31 by A. Ritacco, R. Adam, A. Adane +42
Physics and Astronomy · #Adaptive optics and wavefront sensing #Detector #Extremely high frequency #Intensity (physics) #Millimeter #Modulation (music) #Radio Astronomy Observations and Technology #Rotation (mathematics) #SIGNAL (programming language) #Stokes parameters #Superconducting and THz Device Technology #astro-ph.IM
paper · pdf · doi:10.1007/s10909-015-1340-8
published as Journal of Low Temperature Physics, Volume 184, Issue 3-4, pp. 724-732, 08/2016 · 7 pages, Proceeding for Journal of Low Temperature Physics
arxiv created 2015/10/07 · openalex publication_date 2015/10/19 · openalex created_date 2016/06/24 · arxiv updated 2016/08/18 · openalex updated_date 2026/08/05
NIKA is a dual-band camera operating with 315 frequency multiplexed LEKIDs cooled at 100 mK. NIKA is designed to observe the sky in intensity and polarisation at 150 and 260 GHz from the IRAM 30-m telescope. It is a test-bench for the final NIKA2 camera. The incoming linear polarisation is modulated at four times the mechanical rotation frequency by a warm rotating multi-layer Half Wave Plate. Then, the signal is analysed by a wire grid and finally absorbed by the LEKIDs. The small time constant (< 1ms ) of the LEKID detectors combined with the modulation of the HWP enables the quasi-simultaneous measurement of the three Stokes parameters I, Q, U, representing linear polarisation. In this paper we present results of recent observational campaigns demonstrating the good performance of NIKA in detecting polarisation at mm wavelength.