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Tower 7 – X17 anomaly

Tower 7 – X17 anomaly. MRB Meeting – 22 July 2005. Description and reference documentation. Description of nonconformance Noise anomalies in tower7-layer X17 Detected at Tower7 TVAC test, mainly at high temperature Suspected Root cause

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Tower 7 – X17 anomaly

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  1. Tower 7 – X17 anomaly MRB Meeting – 22 July 2005

  2. Description and reference documentation • Description of nonconformance • Noise anomalies in tower7-layer X17 • Detected at • Tower7 TVAC test, mainly at high temperature • Suspected Root cause • Intermittent and temperature-dependent HV connection to Si-ladder • Reference NCR List • NCR 544

  3. Nonconformance detection method TE301 TE301 TE302 Test TE301 and TE302 from standard CPT suite: entire ladders appear noisy or dead This behaviour is tipical of missing bias on the Si

  4. Additional testing A noise monitor was set-up and run for layer17: continuous runs of TE302

  5. Additional testing T~25C seems to be the failure start temperature

  6. Corrective actions • corrective actions • Replace tray17 on tower7 and repeat environmental tests with tower10 • Pros: • we will fix the anomaly • we do not loose the TVAC slot booked for tower11 • Cons: • tower7 rework

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