TOB sensor quality

1
TOB sensor quality

• Regina Demina
• University of Rochester

2
Outline

• Stability of IV
• Leaky strips

3
IV vs time
3/61 failed on retest
17/250 failed on retest
Current at 400V FNAL remeasurement vs DB
0/65 failed on retest
4
IVCV no vacuum effect so far
Sensor left on chuck for several hours between
measurements 1 and 2. Just needed rest?
5
I leak and I strip
6
Summary

• Some instability of I leak vs time is observed
• 2002 sensors seem to be the worst, fraction of
  originally passed sensors failing retests 6.8
• 2003 sensors look better (but maybe not enough
  time)
• I leak increase seems to be related to leaky
  strip development