Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/calibration/documentation/epic_cal_meetings/200102/new_bad_pixels-P_Bennie.pdf Дата изменения: Wed May 14 13:34:26 2014 Дата индексирования: Wed Apr 13 13:42:26 2016 Кодировка: Поисковые слова: cygnus

Bright Pixel Trends



A localised increase in the number of bright pixels in MOS-2 occurred at the beginning of rev. 108, 1 or 2 days before a solar flare.



A second increase has now been observed, once more located only within MOS-2 and now associated with a flare in rev. 169.
Paul Bennie pbe@star.le.ac.uk Friday, 16 February 2001

XMM EPIC MOS




MOS-2 pixels.



Times of uploads (green) and flares (red) are indicated. numbers growing ly on & 7.
Paul Bennie pbe@star.le.ac.uk Friday, 16 February 2001



The defect seem to be most quick CCDs 1, 2

XMM EPIC MOS




MOS-1 pixels.



Times of uploads (green) and flares (red) are indicated.



There have been no noteable increases in defect numbers.
Paul Bennie pbe@star.le.ac.uk Friday, 16 February 2001

XMM EPIC MOS


New Defects in rev. 108 flare.

XMM EPIC MOS

Paul Bennie pbe@star.le.ac.uk Friday, 16 February 2001


New Defects in rev. 169 flare.

XMM EPIC MOS

Paul Bennie pbe@star.le.ac.uk Friday, 16 February 2001


Conclusions







The last pixel upload (v4-06-dec-2000) is still adequate 2 months after calculation. We have to consider the possibility that the MOS-2 shielding may not be of adequate minimum thickness in all lines of sight. Hence, MOS-2 BPT (CTI) degradation may be accelerated in comparison to MOS-1.
Paul Bennie pbe@star.le.ac.uk Friday, 16 February 2001

XMM EPIC MOS