[PIPE2D-376] Enable crosstalk corrections for PFS CCDs

Relates — Mon, 30 Sep 2019 16:38:56 +0000

The data that Neven showed on slack indicates that we have crosstalk in the PFS CCDs; this is not surprising. We should enable the correction, but of course this requires that we have the coefficients. For now, I think we should use the HSC values (the PFS chips pretend to be 8-amp 4096*4096 chips, but are of course really 4-amp 2048x4096 chips, so we'd need to create a block-diagonal 8x8 matrix with the diagonal 4x4 blocks from HSC).

We should also measure them directly. I think that the easiest way is to take some sparse slit very saturated arc data — saturated enough to have long bleed trails. Assuming that we know the linearity well enough we can use these to measure the cross-talk coefficients.

PFS-JIRA

[PIPE2D-376] Enable crosstalk corrections for PFS CCDs