Display of the NIKA PSF simulated with Zemax, including the complete optics
Purpose: help interpretation of features visible in the real beam study.
context
Figure 1: Distribution on the image plane (array) calculated by the ray tracing algorithm of rays coming from various fields (directions) evenly distributed on a grid pattern on the entrance pupil. Circle diameter = 39 mm, Angular distance between 2 fields diametrically opposed = 2.8'.
Figure 2: Spot diagram = Zoom on the ray tracing distribution of each test field (colored dots) showing the extend of the aberrations of the system as compared to the diffractions effects materialized by the contour of the 1st Airy dark ring (black circles). Typically when the aberration spots are enclosed in the Airy ring, the system is diffraction limited. Oval shape of Airy ring are a symptom of pupil aberrations.
PSF
Figure 3: PSF of the central field for the 1mm band central wavelength (top left), PSF of the central field for a representative distribution of wavelengths along the 1mm bandwidth (top center), PSF of several Fields distributed along the edge of the 2.8' FOV for a representative distribution of wavelengths along the 1mm bandwidth (top right and bottom). The tetrapod spider holding the secondary mirror from teh primary is clearly visible. The distortions are dominated by pupil aberration; image aberrations are negligible.
Figure 4: enlarged and deeper view of the PSF of the central field for the 1mm band central wavelength (left), and PSF of the central field for a representative distribution of wavelengths along the 1mm bandwidth (right)