results from proton-irradiation + “short“ qtc status
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Results from Proton-Irradiation+ “short“ QTC status
Sensor Meeting Tracker-Week 12.07.2001
Frank Hartmann, Christian Piasecki
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Optical inspection of all 78 sensors 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/
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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“.
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Breakdown of the 6054848-Sensor
During first IV-Measurement
ca. 400µA
IV after Breakdown
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Did we lost contact to Bias-Ring ?Problem happened during IV curve:
NO movementsNO relais changes
at the simplest and earliest test;with 7 m tip
Solve: as Vienna we started tomeasure with 2 probes
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Materials
• Hamamatsu Full Sensor (W6b 4919-39)Thickness: 500 mResistivity: 4.6 kcm
• Hamamatsu teststructures (same batch no. 35-41)
• ST Full Sensor (04439218)Thickness: 500 mResistivity: 5.1 kcm
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Irrad. Assembly
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Improvements to our IQC-Probestation for measurements at –10°C
Cold bath to fight humidity
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The Cooling-Jig
Place for several probes to travel withthe jig, plus a „lid“ to avoid condensation!
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Air-Cooler with dry iceSintered copper to havea maximum of surface to transfer minus temperaturefrom dry ice to air
Inlet
Outlet
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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
31MeV p
33MeV p
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Multi-CV Babysensor41 after Irrad
157pF
134Pf
Low dose
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Multi-CV Babysensor39 after Irrad
185pF
146pF
High dose
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Depletion Voltage and Fluence OLD (shown in Catania)
0 50 100 150 200 250 300
0,0
2,0x1019
4,0x1019
6,0x1019
8,0x1019
1,0x10200 50 100 150 200 250 300
0,0
2,0x1019
4,0x1019
6,0x1019
8,0x1019
1,0x10200 50 100 150 200 250 300
0
1x1017
2x1017
3x1017
4x1017
5x1017
150V
No Fluence
Bias Voltage [V]
CV on Ham. TS - Minisensor
180V
Low Fluence
Ca
pa
cita
nce
-2
220V
High Fluence
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Depletion Voltage and FluenceNEW (on HPK minisensors)
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CV for HPK 39 (FS+Baby+Diode)
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Interstrip capacitance of HPK sensor (1 neighbour)
100 fF 3.2 pF
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Interstrip Capacitance (one neighbour) vs. Bias Voltage
after Irradiation
0 200 400 600 800 1000
3,5
4,0
4,5
5,0
5,5
6,0Hamamatsu FS - C
int on strip 335
Cin
t [p
F]
Bias Voltage [V]
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0 10 20 30 40 50 60
1,0
1,2
1,4
1,6
1,8
2,0
Interstrip Capacitance on TS H39
Before After irrad. and annealing
Inte
rstr
ip C
ap
aci
tan
ce [p
F]
Interstrip Capacitance on TS 39 after Irradiation (2 neighbours)
Some bad contacts due to residuals of conductive rubber!?!?!
Vbias = 400V
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Interstrip Capacitance Baby41(2 neighbours)
600V 900V
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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] ^2 Voltage[V] Rint[Mohm] ^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
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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!!
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Strip-Values after Breakdown
ca. 0.5nA
Nominal behavior