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== Prediction of field distortion from Zemax simulations, June 1, 2012, SL ==

 .Example for the 2mm array (which has the bigger FOV in the June 2012 configuration, hence the biggest distortions):

{{attachment:Zemax_NIKA_2012_fit_Grid_distrotion_to_FOV_Geometry_2mm.jpg}}

 .Equations and more details: [[attachment:NIKA_2012_grid_distortion.pdf]]
 .Grid distortion output from zemax (attention this is the position of incoming rays with respect to a regular grid on the image, that is to say the inverse of the FOV distortion !): [[attachment:Zemax_NIKA_2012_grid_distortion_12x12.TXT|12x12 grid]] [[attachment:Zemax_NIKA_2012_grid_distortion_14x14.TXT|14x14 grid]]

== PSF simulated with Zemax at different foci ==

 .Image 1 = 30m telescope with NIKA simulated in ZEMAX, including the tetrapod (arms holding M2 from M1 at ~2/3rd of its radius )
 .Image 2 = Image plane (on KID array) at nominal focus (M2 = 0), fields numbered from 1 to 4 = fields shown on the PSF images; 1 = top left, 2 = top right, 3 = bottom left, 4 = bottom right 
 .Image 3 = PSF at nominal focus (M2 = 0), without the tetrapod
 .Image 4 = PSF at nominal focus (M2 = 0), with the tetrapod
 .Text files of the 4 PSF shown in image 4: [[attachment:Zemax_PSF_field_0_NIKA_2012_1mm_M2_0.TXT|field 0]] [[attachment:Zemax_PSF_field_+X_NIKA_2012_1mm_M2_0.TXT|field +X]] [[attachment:Zemax_PSF_field_+Y_NIKA_2012_1mm_M2_0.TXT|field +Y]] [[attachment:Zemax_PSF_field_-X-Y_NIKA_2012_1mm_M2_0.TXT|field -X-Y]]

{{attachment:Zemax_30m_telescope_NIKA_2012_.jpg}}{{attachment:Zemax_image_plane_NIKA_2012_M2_0_.jpg}}{{attachment:Zemax_PSF_4_fields_distributed_Y_pattern_NIKA_2012_1mm_M2_0_NO_TETRAPOD_.jpg}}{{attachment:Zemax_PSF_4_fields_distributed_Y_pattern_NIKA_2012_1mm_M2_0_.jpg}}

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 .Image 5 = Image plane with positive defocus focus (M2 = +1mm)
 .Image 6 = PSF with positive defocus focus (M2 = +1mm)
 .Text files of the 4 PSF shown in image 6: [[attachment:Zemax_PSF_field_0_NIKA_2012_1mm_M2_+1mm.TXT|field 0]] [[attachment:Zemax_PSF_field_+X_NIKA_2012_1mm_M2_+1mm.TXT|field +X]] [[attachment:Zemax_PSF_field_+Y_NIKA_2012_1mm_M2_+1mm.TXT|field +Y]] [[attachment:Zemax_PSF_field_-X-Y_NIKA_2012_1mm_M2_+1mm.TXT|field -X-Y]]

{{attachment:Zemax_image_plane_NIKA_2012_M2_+1mm_.jpg}}{{attachment:Zemax_PSF_4_fields_distributed_Y_pattern_NIKA_2012_1mm_M2_+1mm_.jpg}}

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 .Image 7 = Image plane with negative defocus focus (M2 = -1mm)
 .Image 8 = PSF with negative defocus focus (M2 = -1mm)
 .Text files of the 4 PSF shown in image 8: [[attachment:Zemax_PSF_field_0_NIKA_2012_1mm_M2_-1mm.TXT|field 0]] [[attachment:Zemax_PSF_field_+X_NIKA_2012_1mm_M2_-1mm.TXT|field +X]] [[attachment:Zemax_PSF_field_+Y_NIKA_2012_1mm_M2_-1mm.TXT|field +Y]] [[attachment:Zemax_PSF_field_-X-Y_NIKA_2012_1mm_M2_-1mm.TXT|field -X-Y]]

{{attachment:Zemax_image_plane_NIKA_2012_M2_-1mm_.jpg}}{{attachment:Zemax_PSF_4_fields_distributed_Y_pattern_NIKA_2012_1mm_M2_-1mm_.jpg}}

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 .Bonus: text files of the PSF at M2 = +0.5mm: [[attachment:Zemax_PSF_field_0_NIKA_2012_1mm_M2_+0.5mm.TXT|field 0]] [[attachment:Zemax_PSF_field_+X_NIKA_2012_1mm_M2_+0.5mm.TXT|field +X]]; and at -0.5mm: [[attachment:Zemax_PSF_field_0_NIKA_2012_1mm_M2_+0.5mm.TXT|field 0]] [[attachment:Zemax_PSF_field_+X_NIKA_2012_1mm_M2_+0.5mm.TXT|field +X]]