14.3.2002Irradiation Workshop KarlsruheA. Furgeri 1 Irradiation in Karlsruhe The Karlsruhe-Probestations Procedure of Irradiation Results Future annealing.

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Presentation transcript:

Irradiation Workshop KarlsruheA. Furgeri 1 Irradiation in Karlsruhe The Karlsruhe-Probestations Procedure of Irradiation Results Future annealing studies

Irradiation Workshop KarlsruheA. Furgeri 2 The Probestation

Irradiation Workshop KarlsruheA. Furgeri 3 Cold measurements

Irradiation Workshop KarlsruheA. Furgeri 4 The Software

Irradiation Workshop KarlsruheA. Furgeri 5 Procedure Measurements of sensors 20°C rel. humidity < 30% – IV & CV – Ileak – Rpoly (2V) – CC (100Hz) – Pinhole (10V) – Rint (0-0,5V)>10G  – Cint (1MHz)

Irradiation Workshop KarlsruheA. Furgeri 6 Procedure Bias connections for irradiation (conductive rubber & bonds) Irradiation –34 MeV-protons –Fluence Annealing 60 °C & 80 min –Mistake: annealing of sensors in the envelopes Same measurements as before irradiation, but -10°C & dew point << -10°C (39°C)

Irradiation Workshop KarlsruheA. Furgeri 7 -10°C From literature

Irradiation Workshop KarlsruheA. Furgeri 8 Leakage current before and after irradiation Guardring connected (for defined Volume) Increase of leakage current as expected Breakdown voltage >1200V

Irradiation Workshop KarlsruheA. Furgeri 9 Depletion voltage before and after irradiation 60°C and 80 min But in the envelopes !

Irradiation Workshop KarlsruheA. Furgeri 10 Leakage current after Irradiation Low Fluence High Fluence Increase of leakage current depends on fluence as aspected

Irradiation Workshop KarlsruheA. Furgeri 11 Rpoly after irradiation 0V 1V 100V No dependence on bias conditions !

Irradiation Workshop KarlsruheA. Furgeri 12 CC after Irradiation 0V 100V 1V No dependence on bias conditions !

Irradiation Workshop KarlsruheA. Furgeri 13 Cint after irradiation 1V No increase of Cint seen

Irradiation Workshop KarlsruheA. Furgeri 14 IQC-ramps

Irradiation Workshop KarlsruheA. Furgeri 15 Annealing curves

Irradiation Workshop KarlsruheA. Furgeri 16 50°C ? Problem of annealing 60 °C high stability of temperature needed Effects of heating up and cooling down become important Problem of annealing 40 °C long time constants T[°C] aa 306d180d53d10d55h4h19min2min b1/1341/781/231/ T[°C] yy 516y61y8y475d17d1260min92min9min b1/3961/471/61/

Irradiation Workshop KarlsruheA. Furgeri 17 Time 50°C Fit from values in the Moll-Thesis: Beneficial annealing: 65 min Reverse annealing: 5162 min Annealing steps: 15 min ?

Irradiation Workshop KarlsruheA. Furgeri 18 Conclusions -10°C after irradiation Annealing without envelopes ! No dependence of stripvalues from bias conditions Next irradiations without bias ?