Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/calibration/documentation/epic_cal_meetings/200502/mk_xiat.pdf Дата изменения: Fri May 16 13:29:01 2014 Дата индексирования: Wed Apr 13 13:15:43 2016 Кодировка: Поисковые слова: barnard 68

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XMM-Newton

Instrument Anomaly Tool & Cross-Calibration Tool

Marcus G. F. Kirsch
Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 1


Situation now

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· Any kind of strange instrument behaviour is reported by the INSCONS to the IDT . MOS2 SW background/noise gradient (BA) MOS2 SW exposure (Obsid: 0644_0147860101) There is a factor 2 in background level between the · Book keeping in minutes `left' and the `right'. low-energy pat0 only electronic noise. It looks like the old problem of the MOS timing fixed-offset prob · Sending information to PI via mail It's a one-off problem. Apparently this "noise" is removed
. The mean values of the PN Q2 offset maps show a marked increase of 4-5 ADU since rev 604. The Q0 CCDs show a smaller increase in mean offset value of 2-3 ADU. In the Q1 and Q3 CCDs one can see a decrease of 1-2 ADU in the same period. This is reminiscent of the post Q2 current anomaly behaviour (September 2001, rev 325). Investigation of the Q2 current F1191 performed by Stephanie shows there is clearly a period between revolution 604 and revolution 609 where the current showed an increase of about 15 mA (from 310 mA to 325 mA). The Q2 current went back to its nominal value (~310 mA) in revolution 610. Investigation of post rev 609 offset maps underway. Problem is also under investigation at MPE / Tuebingen. (MS) to be followed up with MPE by MS . Also under investigation (triggered by MPE) the increased common mode variation seen in some PN offset maps. It seems to occur only in FF and mostly at the first observation of a revolution. A cause could be the enhanced radiation affecting these offsets, although the mechanism which would cause an increase in CM variation is not yet explained. There is not expected to be any impact on science quality as CM variations are corrected for by the on-board event median correction. (MS) to be followed up with MPE by MS

lems.

efficiently by the SAS (to be checked), so virtually no impact on science data, but still it's puzzling why only this SW exposure was affected ... I'll keep that in the back of my mind. (BA) - screened the last 50 revs and the "feature" is still there apparently randomly in ~20-30% of the exposures but a rather low level. I haven't seen extreme example as in the past (see attached) and the occurrence rate seems also to go down, so could it cure by itself. To me this is just another type of unpredictable electronic noise , vetoed efficiently by the SAS anyway (negative E3) , so not a big deal. It affects only MOS2 in SW. (BA) . On-going investigations on the MOS corrupted offsets, more occurrences have been found in the past. (BA)

. curious case of pn offset map loading: GD153 (WD) not optical loading nor x-ray loading; possibly UV loading? (MS) . PN diagonal structures for low energies. Happen to be perhaps at every first observation per rev. only in FF Mode. Could be a resonance or interference effect. Under Investigation in collaboration with MPE (MK) some more analysis of pn noisy offsets: low E diagonal pattern in events image related to enhanced noise in pn offset maps (MS) . investigations on MOS2 CCD5 low energy count rates (MST) - identify the effectivity of detection algorithm for MOS2 CCD5 problem. - investigations on MOS2 CCD5 ODF archive stopped due to processing time. Will be restarted when PPS is finished. - search for correlations and triggers for MOS2 CCD5 problem.

Marcus Kirsch, XMM-Newton European Space Astronomy Center Page 2


XIAT

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· WEB-Device for recording, measuring, or controlling deviation or departure from the normal or common order, form, or rule · Instrument Anomalies (XIA's) are entered by SOC members (or external experts that have access to the internal pages) · Any associated documents may be uploaded · Comments, remarks, additions, corrections or further uploads may be added to the XIA at any time thereafter. · The system functions in a similar manner to a newsgroup or forum, where a subject may be added to at any time.
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Cross-Calibration tool

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· The same tool will be available to discuss cross calibration results · Slight modification needed to adjust to cross-cal needs · Comments are welcome ...

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