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Summary of Sensor Meeting at Karlsruhe University: Optical and Electrical Inspection Report

This report summarizes the findings from the recent sensor meeting held at the University of Karlsruhe, focusing on the optical inspection and electrical measurements of various KA-Sets. Key topics include the condition of sensors, handling issues leading to scratches, delivery statuses, and failure rates. Additionally, the report covers the status of the cyclotron components and performance comparisons between Karlsruhe and Louvain. The findings reveal no significant failures in most KA-Sets, though some discrepancies in behaviors between different batches warrant further investigation.

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Summary of Sensor Meeting at Karlsruhe University: Optical and Electrical Inspection Report

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  1. Status report IEKP – University of Karlsruhe Alexander Furgeri Sensor meeting

  2. QTC • Optical inspection of (16/40) • KA-Set 9 (2.) W5B (5/5) • KA-Set 10/1 W5B (3/8) • KA-Set 11/1 W6B (4/10) • KA-Set 11/2 W6B (4/4) • Electrical measurements of KA-Set 9 (2.) • IV & CV of KA-Sets 10 to 11 (18/35) • Summary • IQC Sensor meeting

  3. Optical inspection KA-S10/1 Batch 31850 W5B (3/8) 9.1.2003 KA-S9 Batch 32965 2. Delivery 26.11.2002 W5B preliminary KA-S11/2 Batch 39728 W6B 9.1.2003 KA-S11/1 Batch 32961 W6B (4/10) 9.1.2003 preliminary Sensor meeting

  4. Impressions of opt. inspection ? IV&CV OK ! Sensor meeting

  5. Summary of optical inspection • Scratches ! On surface and on backplane ! • many at the same region of the sensors (handling facility ?) • some are really deep ! • Antistatic sheets to small for W5B • No -stamps on backplane • No sensor failed Sensor meeting

  6. IV-curves of KA-Set 9 (2.) KA-S9 Batch 32965 2. Delivery 26.11.2003 No failures ! Sensor meeting

  7. CV-curves of KA-S9 KA-S9 Batch 32965 2. Delivery 26.11.2003 Sensor meeting

  8. Strips of KA-S9 No failures ! Sensor meeting

  9. IV-Curves of KA-Set 10/2 W5B Delivered 9.1.2003 2 failures ! Sensor meeting

  10. CV-curves of KA-Set 10/2 Sensor meeting

  11. IV-curves of KA-Set 11/1 W6B Delivered 9.1.2003 No failures ! Sensor meeting

  12. CV-curves of KA-Set 11/1 Sensor meeting

  13. IV-curves of KA-Set 11/2 W5B Delivered 9.1.2003 1 failure ! Sensor meeting

  14. CV-curves of KA-Set 11/2 Sensor meeting

  15. Summary of QTC preliminary Sensor meeting

  16. IQC • Status of cyclotron: • Mechanical part ready • Electrical part problematically • Old components (1962) • Many improvements (automatic temperature control, flux measurement ) • Comparison of Cint-ramps between Louvain and Karlsruhe Statement of main technician: „Ask in 2 weeks“ Sensor meeting

  17. Cint-bumps • Effect only on irradiated ST-mini´s seen • Caused by low Rint ( that´s the problem) • 1 mini sent to Louvain • 3 mini´s sent from Louvain to us, but storage over christmas (3 weeks) at unknown temperature Sensor meeting

  18. Comparison KA-Louvain KA-mini irradiated with p Same behavior! But different values !? Karlsruhe Louvain Strip 92 Sensor meeting

  19. Cint ramps 1 1 8 8 Cint Dissipation Sensor meeting

  20. Rint ramps Maximum of Cint corresponds to Minimum of Rint 1 8 Sensor meeting

  21. Ileakage ramps Profil from 400 V Udep Sensor meeting

  22. Cint ramps (2) In middle of sensor „constant“ 17 27 Sensor meeting

  23. Rint ramps (2) 1 27 In middle of sensor „constant“ Lowest value ~60MOhm Sensor meeting

  24. Ileak ramps (2) Ileak-bumps are no effect of changing temperature during measurement -11°C -10°C -12°C Sensor meeting

  25. Summary of bumps • No temperature effects • Still in specs @400V • „Calibration“ between KA and Louvain • Same behaviour • Different absolute values (due to LCR-mode ?) Sensor meeting

  26. Outlook • Comparison between Cp-D mode and Cp-Rp mode in KA • Measurement of Louvain irrad. Mini in KA • Comparison of Rint ! • Comparison of Rpoly increase (see Eric) Perhaps irradiations ? Sensor meeting

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