Magda Bazalova 2.10.2002 PixelWeek, CERN 1

Charge collection efficiency

July testbeam period

• AMS_310B (CiS FE-IB 60Mrad)• IZM_Bonn_3 (CiS FE-IB 60Mrad)• IZM_F – no signal

Magda Bazalova 2.10.2002 PixelWeek, CERN 2

AMS-310B, 0°, configuration A

200V 300V

600V

700V

400V

Magda Bazalova 2.10.2002 PixelWeek, CERN 3

AMS-310B, 0°, configuration B

200V 300V

600V400V

700V

Magda Bazalova 2.10.2002 PixelWeek, CERN 4

AMS-310B, 30°, configuration B

200V

300V

600V

400V

Magda Bazalova 2.10.2002 PixelWeek, CERN 5

Bonn_3, 0°, configuration A

200V300V

600V

700V

400V

Magda Bazalova 2.10.2002 PixelWeek, CERN 6

Bonn_3, 0°, configuration B

200V 300V

600V400V

700V

Magda Bazalova 2.10.2002 PixelWeek, CERN 7

Bonn_3, 30°, configuration B

200V

300V

600V

400V

Magda Bazalova 2.10.2002 PixelWeek, CERN 8

Average charge collected

A B

0° 0° 30°

200V 10 10 9

300V 13 14 11

400V 15 15 15

600V 21 24 23

700V 23 24

AMS_310B

8

13

18

23

0 200 400 600 800Bias (V)

av

era

ge

ch

arg

e (

Ke

)

A 0deg B 0deg B 30deg

• The average charge collected by Bonn_3 is in all cases 2 Ke less.

Magda Bazalova 2.10.2002 PixelWeek, CERN 9

Conclusion

• The average charge collected with increasing bias as expected

• The average charge is smaller for angle of 30°, but there was done one measurement with 400V and 10°, giving for this bias the best value (17Ke)

• Why is there a hole in the middle of longer dimension?