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XMM­Newton CCF Release Note
XMM­CCF­REL­316
Update of EPIC MOS CTI
Martin Stuhlinger
July 8, 2014
1 CCF components
Name of CCF VALDATE EVALDATE List of Blocks CAL XSCS
(start of val. period) (end of validity period) changed VERSION flag
EMOS1 CTI 0074 2012­12­12T10:00:01 CTI EXTENDED NO
CTI COLUMN
Name of CCF VALDATE EVALDATE List of Blocks CAL XSCS
(start of val. period) (end of validity period) changed VERSION flag
EMOS2 CTI 0075 2012­12­12T10:00:01 CTI EXTENDED NO
CTI COLUMN
1

XMM­Newton CCF Release XMM­CCF­REL­316 Page: 2
2 Changes
A new CTI CCF has been derived for the MOS taking into account the latest measured degradation
rate of the parallel CTI. This new CCF defines a new epoch and replaces for the most recent time
period the previous CTI CCF (MOS1 issue 73, MOS2 issue 74).
The serial CTI is also updated, even though it remains nearly constant since cooling.
3 Scientific Impact of this Update
The use of this set of CCFs will improve the MOS energy scale reconstruction and also marginally
the energy resolution, mainly for all observations later than revolution >2383.
The CTI CCF is released together with a new ADUCONV CCF (MOS1 issue 86, MOS2 issue
87, see XMM­CCF­REL­317), since using the new CTI CCFs with the old ADUCONV CCFs, or
the old CTI CCFs with new ADUCONV CCFs, may give unexpected results!
4 Estimated Scientific Quality
This issue ensures that the MOS energy scale remains within about 5 eV at 2keV, and about 10 eV
for most sources (not too bright), for all observations (see a more detailed discussion in XMM­CCF­
REL­124).
It is recalled that since SASv5.4 the MOS parallel CTI is modelled with the simple formula of
the CTI loss per transfer:
. CT IY (E, t) = (A +B # t) # E #
where A is a constant, B the degradation rate (slope), # a power index (all 3 parameters take
di#erent values for di#erent CCDs and di#erent time periods), E the event energy in ADUs and t
the time since launch. Note that the serial CTI is also modelled with the same formula but is mostly
constant since launch. Since SASv7.0, the energy correction uses an additional o#set term:
. E corr = E +RAWY # CT IY +RAWX # CT IX -OFFSET (RAWX,RAWY )
This algorithm allows an energy scaling of the CTI that fits very well the Mn and Al lines of the
internal calibration source.
5 Test procedures & results
The new CTI CCF has been tested with the SASv13.5. The results are presented in Fig. 1 and
Fig. 2.
Plots of the line monitoring are presented in the accompanying release note XMM­CCF­REL­317
of the corresponding updated MOS ADUCONV CCF.

XMM­Newton CCF Release XMM­CCF­REL­316 Page: 3
6 Expected Updates
None.

XMM­Newton CCF Release XMM­CCF­REL­316 Page: 4
Serial CTI
2400
2450
2500
2550
2600
­0.01
0.00
0.01
0.02
0.03
0.04
0.05 1 Al Mn
Parallel CTI
2400
2450
2500
2550
2600
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.00 0.01
0.02
0.03
0.04
0.05
0.06
1 Al Mn
2400
2450
2500
2550
2600
­0.01
0.00
0.01
0.02
0.03
0.04
0.05 2 Al Mn
2400
2450
2500
2550
2600
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.00 0.01
0.02
0.03
0.04
0.05
0.06
2 Al Mn
2400
2450
2500
2550
2600
­0.01
0.00
0.01
0.02
0.03
0.04
0.05 3 Al Mn
2400
2450
2500
2550
2600
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.00 0.01
0.02
0.03
0.04
0.05
0.06
3 Al Mn
2400
2450
2500
2550
2600
­0.01
0.00
0.01
0.02
0.03
0.04
0.05 4 Al Mn
2400
2450
2500
2550
2600
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.00 0.01
0.02
0.03
0.04
0.05
0.06
4 Al Mn
2400
2450
2500
2550
2600
­0.01
0.00
0.01
0.02
0.03
0.04
0.05 5 Al Mn
2400
2450
2500
2550
2600
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.00 0.01
0.02
0.03
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0.05
0.06
5 Al Mn
2400
2450
2500
2550
2600
­0.01
0.00
0.01
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0.03
0.04
0.05 6 Al Mn
2400
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2500
2550
2600
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.00 0.01
0.02
0.03
0.04
0.05
0.06
6 Al Mn
2400 2450 2500 2550 2600
­0.01
0.00
0.01
0.02
0.03
0.04
0.05 7 Al Mn
2400 2450 2500 2550 2600
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.00 0.01
0.02
0.03
0.04
0.05
0.06
7 Al Mn
Figure 1: MOS1 serial and parallel transfer losses at about 1.5 keV and 6 keV, the energy of the
Al and Mn calibration lines, for CCD1 to CCD7 (top to bottom), overlaid with the CTI models as
parametrised in the new CCF.

XMM­Newton CCF Release XMM­CCF­REL­316 Page: 5
Serial CTI
2400
2450
2500
2550
2600
­0.02
­0.01
0.00
0.01
0.02
0.03 1 Al Mn
Parallel CTI
2400
2450
2500
2550
2600
0.02
0.03
0.04
0.06
0.02
0.03
0.04
0.05
0.06
1 Al Mn
2400
2450
2500
2550
2600
­0.02
­0.01
0.00
0.01
0.02
0.03 2 Al Mn
2400
2450
2500
2550
2600
0.02
0.03
0.04
0.05
0.06
0.02
0.03
0.04
0.05
0.06
2 Al Mn
2400
2450
2500
2550
2600
­0.02
­0.01
0.00
0.01
0.02
0.03 3 Al Mn
2400
2450
2500
2550
2600
0.02
0.03
0.04
0.05
0.06
0.02
0.03
0.04
0.05
0.06
3 Al Mn
2400
2450
2500
2550
2600
­0.02
­0.01
0.00
0.01
0.02
0.03 4 Al Mn
2400
2450
2500
2550
2600
0.02
0.03
0.04
0.05
0.06
0.02
0.03
0.04
0.05
0.06
4 Al Mn
2400
2450
2500
2550
2600
­0.02
­0.01
0.00
0.01
0.02
0.03 5 Al Mn
2400
2450
2500
2550
2600
0.02
0.03
0.04
0.05
0.06
0.02
0.03
0.04
0.05
0.06
5 Al Mn
2400
2450
2500
2550
2600
­0.02
­0.01
0.00
0.01
0.02
0.03 6 Al Mn
2400
2450
2500
2550
2600
0.02
0.03
0.04
0.05
0.06
0.02
0.03
0.04
0.05
0.06
6 Al Mn
2400 2450 2500 2550 2600
­0.02
­0.01
0.00
0.01
0.02
0.03 7 Al Mn
2400 2450 2500 2550 2600
0.02
0.03
0.04
0.05
0.06
0.02
0.03
0.04
0.05
0.06
7 Al Mn
Figure 2: MOS2 serial and parallel transfer losses at about 1.5 keV and 6 keV, the energy of the
Al and Mn calibration lines, for CCD1 to CCD7 (top to bottom), overlaid with the CTI models as
parametrised in the new CCF.