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Results from Proton-Irradiation + “short“ QTC status

Results from Proton-Irradiation + “short“ QTC status. Sensor Meeting Tracker-Week 12.07.2001. Frank Hartmann, Christian Piasecki. Optical inspection of all 78 sensors is finished. All Sensors are fine! and compatible to the former results, shown at the last meetings.

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Results from Proton-Irradiation + “short“ QTC status

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  1. Results from Proton-Irradiation+ “short“ QTC status Sensor Meeting Tracker-Week 12.07.2001 Frank Hartmann, Christian Piasecki

  2. Optical inspection of all 78sensors is finished All Sensors are fine! and compatible to the former results, shown at the last meetings. Results can be regarded at http:\\www-ekp.uni-karlsruhe.physik.de/~cms/

  3. Electrical-Tests of 32 Sensors finished • Still problems with „residual“ passivation-layer on the • DC-Pads at the „long side“. • But no problems when we measure the • DC-Pads at the • „short side“.

  4. Breakdown of the 6054848-Sensor ca. 400µA During first IV-Measurement IV after Breakdown

  5. Did we lost contact to Bias-Ring ? Problem happened during IV curve: NO movements NO relais changes at the simplest and earliest test; with 7 mm tip Solve: as Vienna we started to measure with 2 probes

  6. Materials • Hamamatsu Full Sensor (W6b 4919-39)Thickness: 500 mmResistivity: 4.6 kWcm • Hamamatsu teststructures (same batch no. 35-41) • ST Full Sensor (04439218)Thickness: 500 mmResistivity: 5.1 kWcm

  7. Irrad. Assembly

  8. Improvements to our IQC-Probestation for measurements at –10°C Cold bath to fight humidity

  9. The Cooling-Jig Place for several probes to travel with the jig, plus a „lid“ to avoid condensation!

  10. Air-Cooler with dry ice Sintered copper to have a maximum of surface to transfer minus temperature from dry ice to air Outlet Inlet

  11. Proton-Irradiation-Resultsnew dose calculations (p  n)all in 10^14 n(1MeV)/cm^2 Ham. Diode39: Ileak 2,56 Ni 2.6 Ham. FSensor: Ileak 3,8 (difficult-not reliable) Ni 3,0 ST FSensor: Ileak 0,85 Ni 0,70 Ham. Diode41: Ileak 0,94 Ni 0,72 Ham. Mini41: Ileak 0,95 Ni 0,72 Wanted: 2.5 1.5 (less irrad from cyclotron as calculated)  0.9 33MeV p 31MeV p

  12. Multi-CV Babysensor41 after Irrad Low dose 157pF 134Pf

  13. Multi-CV Babysensor39 after Irrad High dose 185pF 146pF

  14. Depletion Voltage and Fluence OLD (shown in Catania)

  15. Depletion Voltage and FluenceNEW (on HPK minisensors)

  16. CV for HPK 39 (FS+Baby+Diode)

  17. Interstrip capacitance of HPK sensor (1 neighbour) 100 fF 3.2 pF

  18. Interstrip Capacitance (one neighbour) vs. Bias Voltage after Irradiation

  19. Interstrip Capacitance on TS 39 after Irradiation (2 neighbours) Vbias = 400V Some bad contacts due to residuals of conductive rubber!?!?!

  20. Interstrip Capacitance Baby41(2 neighbours) 600V 900V

  21. Interstrip Resistance vs. Biasvoltage HPK TS-Baby39 (full dose) Strip 80-81 at –7°C Strip 88-89 at –5,5°C Voltage[V] Rint[Mohm] c^2 Voltage[V] Rint[Mohm] c^2 0 26,4 2,72 E-4 0 20,6 2,44 E-4 50 119 7,19 E-4 50 232 2,27 E-3 100 675 5,66 E-4 100 to high ~ E-2 150 to high ~ E-2 200 to high ~ E-2

  22. Conclusion • Evaluation on minisensor, diode and FS only • Irradiation with protons is feasible with small bias voltage  near to final LHC condition • The IQC in Karlsuhe is ready with some possible improvements, learned at this system test level • Many improvements already implemented since Catania •  Proposal for the ingot pre-qualification!!

  23. Strip-Values after Breakdown Nominal behavior ca. 0.5nA

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