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From: kargaltsev@gwu.edu
Subject: operating MOS1 in timing and MOS2 in imaging modes
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Date: Mon, 28 Sep 2015 22:57:49 GMT
From: kargaltsev@gwu.edu
To: xmmhelp@sciops.esa.int
CC: kargaltsev@gwu.edu
Subject: operating MOS1 in timing and MOS2 in imaging modes
Full_Name: Oleg Kargaltsev
Submission from: (NULL) (70.171.0.83)


Dear XMM Helpdesk,

I am thinking of designing an observation where PN and MOS2 will be operated in
the imaging mode and MOS1 will be in timing mode. The motivation is that there
is a large extended object with the central source so PN and MOS2 (has no dead
CCDs) will be used to obtain spatially-resolved spectroscopy and the central CCD
of MOS1 (2 dead CCDs) will be used for timing of the central source. However, I
recalled that during the enhancement evaluation of one of my previous
observations I got the following warning:

"********************************************************************************

M1_TIMING: Warning: Timing mode is set in MOS1

DESCRIPTION: EPIC team recommends the users not to use MOS1 in timing mode 
in case they want to observe using one MOS in imaging and other MOS in timing
mode

SUGGESTION: Revise modes of MOS1 and MOS2.


Problem #0001: M1_TIMING: Warning: Timing mode is set only in MOS1"
*************************************************************************

Can you please explain the problem with using MOS1 timing mode? Does the problem
only happen when MOS1 is in timing mode and MOS2 is some other mode? Is there
any problem with MOS2 timing mode? 

Thank you!

Oleg


Reply 1

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From: Rosario Gonzalez Riestra <xmmhelp@sciops.esa.int>
To: kargaltsev@gwu.edu
Subject: Re: operating MOS1 in timing and MOS2 in imaging modes (PR#77472)
Date: Tue Sep 29 08:08:07 2015

Dear Dr. Kargaltsev,

There is not any technical reason preventing the use of MOS1 in timing mode.

In general, we recommend that, if only one of the MOS cameras is to be used in
timing mode, to choose MOS2. The reason is that the central CCD of MOS1 has a
bad column close to the centre of the chip. This column cannot be used for
science analysis, therefore the effective area is somewhat reduced. Also,
depending on the observation the two adjacent columns may also need to be
excluded. Otherwise, apart from the loss of effective area there is not any
problem.



Regards,

Rosario Gonzalez-Riestra
XMM-SOC User Support Group

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