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antilogus committed Dec 10, 2024
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Expand Up @@ -14,6 +14,7 @@ These "hard to clear" charges , are associated to highly saturated
flat or column ( or stars as observed in AuxTel or ComCam), that will leave signal in the
first lines of the following exposure. We have the following signature
of the effect :

- in all ITL CCD except in R01_S10 for which the effect is much more significant and that will be addressed later in this section:

the first CCD line of the following exposure is ~ saturated and signal is also present in the 2nd line read of the CCD.
Expand Down Expand Up @@ -50,7 +51,8 @@ pockets at this image-serial register interface.


In the above image , we present for 3 types of sequencer ( from left to right : V29 , NoP and NopSF), a zoom on the first lines of an e2v amplifier ( here R12_S20 C10) shown as a 2D image ( top
plots) and presented as the mean signal per line (bottom plots). A bias taken just after a saturated flat in a e2v CCD will show a residual signal in the first lines when using the default clear (left images,clear=v29 ) : the first line has an almost saturated signal ( ~ 100 kADU here), and a significant signal is seen up to the line ~50 here. In practice, in function of the amplifier, signal can be seen up to line 20-50. When using the NoP clear (central plots), we can already see a strong reduction of the unclear charges still present in the first acquired bias after a saturated flat. The NoPSF clear fully clear the saturated flat , and no uncleared charges are observed in the following bias.
plots) and presented as the mean signal per line (bottom plots). A bias taken just after a saturated flat in a e2v CCD will show a residual signal in the first lines when using the default clear (left images,clear=v29 ) : the first line has an almost saturated signal ( ~ 100 kADU here), and a
significant signal is seen up to the line ~50 here. In practice, in function of the amplifier, signal can be seen up to line 20-50. When using the NoP clear (central plots), we can already see a strong reduction of the unclear charges in the first acquired bias after a saturated flat, still a small residual signal is visible in the first ~ 20 lines. The NoPSF clear fully clear the saturated flat, and no uncleared charges are observed in the following bias.


Conclusion
Expand All @@ -61,25 +63,28 @@ Conclusion
.. table:: This table summaries the different clear methods used so
far . .

+------------------------------------------+-----------------+------------------+----------------------+-----------------------+-----------------+---------------------------------+-----------+----------+
| | Default Clear | Multi Clear | Multi Clear | Deep Clear | No Pocket (NoP)| No Pocket Serial Flush (NoPSF) | Header 3 | Header 4 |
| | 1 Clear | 3 Clears | 5 Clears | 1 Clear | 1 Clear | 1 Clear | | |
| | (seq. V29 ) | (seq. V29 ) | (seq. V29 ) | (Seq. V23 DC) | (seq. V29_NoP) | ( seq. V29, V30 ) | | |
+==========================================+=================+==================+======================+=======================+=================+=================================+===========+==========+
| Clear duration | 65.5 ms | 196.5 ms | 327.4 ms | 64.69 ms | 65.8 ms | 67 ms | | |
+------------------------------------------+-----------------+------------------+----------------------+-----------------------+-----------------+---------------------------------+-----------+----------+
| "E2V" after saturated Flat | |No residual electrons in following image | | | | | |
+------------------------------------------+-----------------+------------------+----------------------+-----------------------+-----------------+---------------------------------+-----------+----------+
| R30_S10_C10 E2V | | No residual electrons | | | | | |
| Bright Column (~ sat. Star) | | in following image | | | | | |
+------------------------------------------+-----------------+------------------+----------------------+-----------------------+-----------------+---------------------------------+-----------+----------+
| "ITL" after saturated Flat | |No residual electrons in following image | | | | | |
+------------------------------------------+-----------------+------------------+----------------------+-----------------------+-----------------+---------------------------------+-----------+----------+
| R02_S20_C14 ITL | | No residual electrons | | | | | |
|Bright Column (~ sat. Star) | | in following image | | | | | |
+------------------------------------------+-----------------+------------------+----------------------+-----------------------+-----------------+---------------------------------+-----------+----------+
| R01_S10 ITL "unique" | | | | | | | | |
+------------------------------------------+-----------------+------------------+----------------------+-----------------------+-----------------+---------------------------------+-----------+------=---+
+------------------------------------------+-------------------+------------------+----------------------+-----------------------+--------------------+---------------------------------+
| | Default Clear | Multi Clear | Multi Clear | Deep Clear | No Pocket (NoP) | No Pocket Serial Flush (NoPSF) |
| | 1 Clear | 3 Clears | 5 Clears | 1 Clear | 1 Clear | 1 Clear |
| | (seq. V29 ) | (seq. V29 ) | (seq. V29 ) | (Seq. V23 DC) | (seq. V29_NoP) | ( seq. V29, V30 ) |
+==========================================+===================+==================+======================+=======================+====================+=================================+
| Clear duration | 65.5 ms | 196.5 ms | 327.4 ms | 64.69 ms | 65.8 ms | 67 ms |
+------------------------------------------+-------------------+------------------+----------------------+-----------------------+--------------------+---------------------------------+
| "E2V" after saturated Flat |1st line saturated |No residual | No residual | |sig. up to line 20 | No residual |
| |sig. up to line 50 | electrons | electrons | | | electrons |
+------------------------------------------+-------------------+------------------+----------------------+-----------------------+--------------------+---------------------------------+
| R30_S10_C10 E2V | | No residual | No residual | | | |
| Bright Column (~ sat. Star) | | electrons | electrons | | | |
+------------------------------------------+-------------------+------------------+----------------------+-----------------------+--------------------+---------------------------------+
| "ITL" after saturated Flat | | No residual | No residual | | | |
| | | electrons | electrons | | | |
+------------------------------------------+-------------------+------------------+----------------------+-----------------------+--------------------+---------------------------------+
| R02_S20_C14 ITL | | No residual | No residual | | | |
|Bright Column (~ sat. Star) | | electrons | electrons | | | |
+------------------------------------------+-------------------+------------------+----------------------+-----------------------+--------------------+---------------------------------+
| R01_S10 ITL "unique" | | | | | | |
| | | | | | | |
+------------------------------------------+-------------------+------------------+----------------------+-----------------------+--------------------+---------------------------------+



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