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 | ||
| X | Y | X | Y | |
|
|
||||
| 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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