diff --git a/sections/serialRemnants.rst b/sections/serialRemnants.rst index ca9540f..e9bb089 100644 --- a/sections/serialRemnants.rst +++ b/sections/serialRemnants.rst @@ -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. @@ -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 @@ -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" | | | | | | | + | | | | | | | | + +------------------------------------------+-------------------+------------------+----------------------+-----------------------+--------------------+---------------------------------+