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Table 2

Upper limit of diffusion variation for CCD E2V-250 illuminated by 550 nm spots and for DECam CCD N17 in r-band.

Size (μm) CCD E2V-250 DECam

Initial PSF 15.94 16.22 25.64 28.86
PSF at 100 ke 16.41 16.74 25.97 29.18
Observed increase 0.47 0.52 0.33 0.32

Diffusion (σPSF) <4.00 <4.00 <7.00 <7.00
0.018 0.018 0.067 0.067

Diffusion contribution (%) 3.7 3.4 20.2 20.7

Notes. The relative difference between the two results is coming from the operating bias voltages (CCD E2V-250 is operated with a ~6 times higher drift field than DECam). The final contribution of the diffusion to the PSF broadening is half its total variation.

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