Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/docs/documents/CAL-SRN-0071-1-0.ps.gz Дата изменения: Fri May 4 16:17:44 2001 Дата индексирования: Mon Oct 1 21:56:13 2012 Кодировка: Поисковые слова: annular solar eclipse

XMM­Newton CCF Release Note
XMM­CCF­REL­71
RGS2 CCD2 Thickness of SiO 2 Layer
C. Erd
April 11, 2001
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
RGS2 QUANTUMEF 0007 1998­01­01T00:00:00 CCD DESC --- NO
2 Changes
For CCD2 the thickness of the in­active layer of SiO 2 is increased from = 0 to 40 nm.
3 Scientific Impact of this Update
CCD2 was found to have a significantly lower efficiency than the remainder of the CCD's. This
modification corrects that and brings the estimated response in­line with observations from the
data.
4 Estimated Scientific Quality
The source of this apparent in­active layer could not be established to date. This absorbing layer
was deduced from data by comparisons between first and second orders and also by comparisons
with RGS1 and was found to be the most appropriate combination of material and thickness to best
describe the data [1]. The accuracy with this CCF is estimated to ё 5%.
1

XMM­Newton CCF Release XMM­CCF­REL­71 Page: 2
References
[1] C. de Vries. Comparing RGS1/RGS2 and CCD2 RGS2. RGS­SRON­CAL­
ME­01/cv1, Space Research Organization of the Netherlands, February 2001.
http://ws13.sron.nl:8080/xmmdoc/effective area/rgs­sron­cal­me­01 cv1.ps.