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Update on FNAL production exercise

Update on FNAL production exercise. Module 7547 - I. Cut strips. Vpsp = 40. noise. Module 7547 - II. Grade B. Vpsp = 36. Retested 6 modules with CMN Only one shows all features we’ve seen before: No noise at low applied voltage Noise shows up at 350V and increases with applied voltage

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Update on FNAL production exercise

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  1. Update on FNAL production exercise US CMS meeting 04/06/2004

  2. Module 7547 - I Cut strips Vpsp = 40 noise US CMS meeting 04/06/2004

  3. Module 7547 - II Grade B Vpsp = 36 US CMS meeting 04/06/2004

  4. Retested 6 modules with CMN Only one shows all features we’ve seen before: No noise at low applied voltage Noise shows up at 350V and increases with applied voltage 4 strips with very high noise CMN modules US CMS meeting 04/06/2004

  5. Other: No strips with high noise on the chip with CMN No dependence on applied voltage Low response to calibration pulse (1/2 of the normal PH) Pedestal “drifts” with time: goes up to 220 230 ADC then goes down to 0 and stays there Power cycling sets it to nonzero CMN modules ??? US CMS meeting 04/06/2004

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