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TOB sensor quality

TOB sensor quality. Regina Demina University of Rochester. Outline. Stability of IV Leaky strips. 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. IVCV no vacuum effect so far.

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TOB sensor quality

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  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

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