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Noise in TOB modules and sensor quality

Noise in TOB modules and sensor quality. Regina Demina University of Rochester. Module 876. Of the 16 modules tested at UCSB, Observed peculiarity in module testing : Noise on some channels increases with bias voltage. Micro discharge effect (also seen in D0 sensors delivered by Micron).

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Noise in TOB modules and sensor quality

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  1. Noise in TOB modules and sensor quality Regina Demina University of Rochester

  2. Module 876 • Of the 16 modules tested at UCSB, • Observed peculiarity in module testing : • Noise on some channels increases with bias voltage. • Micro discharge effect (also seen in D0 sensors delivered by Micron)

  3. Module 876 • Defects in channels 278 and 279. Not found in sensor probing

  4. Module 876

  5. Module 877 • Defect (scratch) in channel 333. Not found in sensor probing

  6. Module 877

  7. Module 878 • Defect in channel 377. Not found in sensor probing

  8. Module 878

  9. Module 880 • Strip 91 a known pinhole in the first sensor.

  10. Module 880

  11. Module 868 • Mid-sensor opens in channels 69-71 in the 1st sensor

  12. Module 868

  13. Module 883 • Defect in channel 166. Not found in sensor probing

  14. Module 883 • Scratch in channel 316

  15. Module 883

  16. Module 872 • Defect in channel 303. Not found in sensor probing

  17. Module 872 • Scratch in channel 344. Not found in sensor probing

  18. Module 872

  19. Summary • Module # Comments 875 Channel 384 has high noise, but no lithography error present. NOT SEEN IN SENSOR PROBING 874 Found High Istrip channel in 2nd sensor (294) causes noise. Remove 293-295 between sensors and module is good 873 Micro-discharge at channel 14 at 270 V (need to pluck 10-18 to remove cmn). No obvious sensor damage. NOT SEEN IN SENSOR PROBING 872 4 channels with noise increase with HV. 3 have obvious lithographic error. NONE SEEN IN SENSOR PROBING 871 Micro-discharge at channel 181 at 300 V (need to pluck 175-187 to remove cmn). No obvious sensor damage. NOT SEEN IN SENSOR PROBING 870 Good 883 Channel 166 has increasing noise with HV. Has lithographic error (see picture). NOT SEEN IN SENSOR PROBING 882 Good

  20. Summary • Module # Comments 881 Micro-discharge at channels 438-440 (need to pull 434-444 to stop high cmn). Channels start discharging at 0V and get worse 869 Micro-discharge at channels 29-30 (need to pull 24-36 to stop high cmn) at 400 V 868 3 mid-sensor opens, lithographic error (see photo). NOT FOUND IN SENSOR PROBING 880 NO PROBLEMS 879 NO PROBLEMS • 878 Channel 377 has increasing noise vs bias. Lithographic error found in second sensor (see picture). • NOT SEEN IN SENSOR PROBING • 877 Channel 334 has slightly higher noise at 550 V. Lithographic error found in first sensor. (See picture.) • NOT FOUND IN SENSOR PROBING • 876 Channels 278-279 have increasing noise vs. bias voltage. Sensor lithographic error found on both channels (see picture) NOT FOUND IN SENSOR PROBING

  21. Summary • Out of 16 modules built 11 show some signs of micro discharge. • Total number of noisy strips – 17 • Number of strips with high I strip – 1 • Number of strips with obvious lithographic error – 8 • Opens - 3

  22. Module 875

  23. Module 874

  24. Module 873

  25. Module 871

  26. Module 870

  27. Module 882

  28. Module 881

  29. Module 869

  30. Module 879

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