Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/calibration/documentation/epic_cal_meetings/200207/02_07_02_CAL_VILSPACTE_MOS.pdf Дата изменения: Wed May 14 13:29:00 2014 Дата индексирования: Wed Apr 13 13:44:06 2016 Кодировка: IBM-866 Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п п

MOS CTI

fast shift sky

E

P h o to n

CTE

y sk y _ fa s t

(t) (t) (t)

fast shift framestore slow shift framestore

C T E C T E =E

600 - y fra m esto re _ fa st y fra m esto re _ slo w

XMM-Newton
б

Marcus Kirsch
д вг

Science Operations & Data Systems Division Research & Scientific Support Department


how to derive the different CTEs ?
C C C C C EEE (ot()t()t ) T E sskskyyy __f aaatsst(t(yyy, ,t t === o 2o 2 2 T E k _ f fs ( , t ) ) ) EEE(ot()t()t ) o 1o 1 1 EE2 ( t()t ) T E f r a m e s t o r e _ f a s t ( ( y t ) )== n n 2 T E fra m e sto r e _ fa s t y , , t E ( t ) n E1n 1 ( t ) E y +1 ( t 0 ) T E fr a m e s to r e _ s lo w ( y , t ) = E y (t0 )
difficult or not possible to distinguish between the different CTEs
XMM-Newton
б

Marcus Kirsch
вг

Science Operations & Data Systems Division Research & Scientific Support Department


current situation
high energy radiation degrades CTE continuously

solar flares offset the CTE and change slope XMM-Newton
б

Marcus Kirsch
вг

Science Operations & Data Systems Division Research & Scientific Support Department


possible future treatment -- 1
§ degradation due to high energy particles is predictable could be modeled § steps and changes of slope of CTI are not (yet) predictable н dependent on intensity of flare might be modeled in correlation with intensity and duration of flare

XMM-Newton
б

Marcus Kirsch
вг

Science Operations & Data Systems Division Research & Scientific Support Department


possible future treatment -- 2
§ further investigation on different dependencies of CTE might lead to a physical model § empirical model updated regularly after strong solar flares might be a pragmatic solution § Questions:
н н н Is there evidence for rate dependence of CTI ? Has this been measured on ground ? How will we distinguish between future CTI degradation and gain changes ?

XMM-Newton
б

Marcus Kirsch
вг

Science Operations & Data Systems Division Research & Scientific Support Department