XIS CCD Screening Summary

Candidate CCDs are screened to characterize optimum performance. From the inventory of screened devices 4 flight and 1 backup unit will be chosen. Screening is done under nearly identical conditions; -90 c using the XIS-2 engineering electronics running the seqi (maximum parallel clock voltage) version sequencer.

Screening Highlights

CCD Noise RMS (e-) CTI @ 5.9 keV (10 -6) Dark Current (e-/sec) FWHM @5.9 keV (eV) FWHM @525eV
w206c2 1.5 - 1.7 0.3 - 1.0 0.04 - 0.05 125.7 - 127.5 42.3 - 44.1
w280c1 1.6 - 1.8 < 0.6 0.01 - 0.13 124.6 - 127.0 44.1 - 45.0
w283c1 1.6 - 1.8 < 0.4 0.03 - 0.04 125.3 - 128.1 44.1 - 45.5
w285c1 2.4 - 2.5 <0.6 nill 127.5 - 129.6 41.9 - 42.7
w292c2 1.7 - 2.1 <0.2 0.05 - 0.07 124.6 - 126.7 42.2 - 43.0
w328c1 3.8 - 4.3 <2.1 0.55 - 0.59 138.4 - 147.9 64.3 - 70.7
w328c2 3.5 - 4.1 <1.7 0.14 - 0.17 133.8 - 137.7 55.2 - 59.9
w328c3 3.7 - 4.0 <1.6 0.14 - 0.17 134.4 - 138.3 59.2 - 62.7
w333c1 3.4 - 3.7 nill 0.25 - 0.27 131.3 - 133.8 56.9 - 60.2
w335c3 5.1 - 5.9 nill 0.11 - 0.17 141.1 - 146.5 58.3 - 67.7
w340c2 4.0 - 4.3 <0.6 0.11 - 0.13 134.5 - 139.7 59.0 - 63.0
w404c4 3.0 - 3.3 <0.6 0.12 - 0.16 132.5 - 135.2 51.7 - 52.9
w445c2 2.3 - 2.5 0.01 - 2.0 0.08 - 0.10 128.1 - 136.3 46.3 - 49.6
w447c2 2.8 - 3.1 0.01 - 1.4 0.11 - 0.16 129.7 - 136.1 48.7 - 52.7
w411c1 3.7 - 4.2 7.7 - 34.0 0.09 - 0.11 145.7 - 162.1 60.9 - 66.1

Dark Maps at -90 c

Scale

<-- 0.0 linear to 0.4 e-/sec -->

w206c2

w206c2


w280c1


w283c1


w292c2


w328c1


w328c2


w328c3


w333c1


w335c3


w340c2


w404c4


w445c2


w447c2


w411c1