WFC Serial FPR
FPR serial CTE is similar to EPER, i.e., insignificant compared to EPER parallel CTE and showing chip dependence. However, unlike EPER serial CTE, discontinuity around the time of -77C to -81C temperature change is more apparent.
ACS ISR 2005-03 did not publish coefficients for FPR serial CTE. Below is the table with the new coefficients. MJD limits are defined such that MJD1 <= MJD < MJD2. Only Amps A and D ~1620e data are sufficient for fitting, so p coefficient could not be calculated (assumed to be 0). As a result, there are no predictions for CTE vs Signal. Their fits are shown in CTE vs Time.
| MJD1 | MJD2 | AMP | n | c | Notes about MJD2 |
|---|---|---|---|---|---|
| 52335 | 53918 | Aa | 3.683x10-6 | 6.890x10-9 | -77C to -81C; Switched to Side-2 |
| Db | 1.132x10-6 | 3.848x10-9 | |||
| 53918 | 58849 | Aa | 1.521x10-6 | 5.586x10-9 | A distant future |
| Db | -4.769x10-6 | 5.767x10-9 | |||
| a WFC1. Only 1620e used. | |||||
| b WFC2. Only 1620e used. | |||||
CTE vs Signal
Here is the legend:
CTE vs Time
Only Amps A and D ~1620e:
All data:
Here is the legend:
