Irradiation in Karlsruhe
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Transcript of Irradiation in Karlsruhe
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Irradiation in KarlsruheIrradiation in Karlsruhe
• The Karlsruhe-Probestations
• Procedure of Irradiation
• Results
• Future annealing studies
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The ProbestationThe Probestation
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Cold measurementsCold measurements
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The SoftwareThe Software
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ProcedureProcedure• Measurements of sensors
– @ 20°C– @ rel. humidity < 30%– IV & CV– Ileak – Rpoly (2V) – CC (100Hz)
– Pinhole (10V) – Rint (0-0,5V) >10G
– Cint (1MHz)
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ProcedureProcedure
• 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)
21
21 14
,14
, 108,0103cm
nbarreloutereqcm
nbarrelinnereq
MeVMeV
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Alpha @ -10°CAlpha @ -10°C
cmA
VI
C eq
C 1720 10420
??10
10
eq
C
VI
C 2010 20
10 C
C
II
C
From literature
cmA
CKK
CeTI
eTIC
KKBkeV
CTBkeV
C
CTBkeV
C
e 1820
2
293263
2010
102,12631
2931
24,1
2024,1
2200
1024,1
2100
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Leakage current before and Leakage current before and after irradiationafter irradiation
• Guardring connected (for defined Volume)• Increase of leakage current as expected• Breakdown voltage >1200V
irradII
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Depletion voltage before and Depletion voltage before and after irradiationafter irradiation
• Annealed @ 60°C and 80 min• But in the envelopes !
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Leakage current after IrradiationLeakage current after Irradiation
Low FluenceHigh Fluence
Increase of leakage current depends on fluence as aspected
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Rpoly after irradiationRpoly after irradiation
0V
1V
100V
No dependence on bias conditions !
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CC after IrradiationCC after Irradiation0V 100V
1V No dependence on bias conditions !
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Cint after irradiationCint after irradiation
1V
No increase of Cint seen
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IQC-rampsIQC-ramps
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Annealing curvesAnnealing curves
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Annealing @ 50°C ?Annealing @ 50°C ?• Problem of annealing studies @ 60 °C
• high stability of temperature needed• Effects of heating up and cooling down become important
• Problem of annealing studies @ 40 °C• long time constants
T[°C] -10 -7 0 10 20 40 60 80
a 306d 180d 53d 10d 55h 4h 19min 2min
b 1/134 1/78 1/23 1/5 1 16 174 1490
T[°C] -10 0 10 20 40 60 80 100
y 516y 61y 8y 475d 17d 1260min 92min 9min
b 1/396 1/47 1/6 1/1 29 544 7430 76650
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Time constants @ 50°CTime constants @ 50°C• Fit from values in the Moll-Thesis:
• Beneficial annealing: 65 min• Reverse annealing: 5162 min
Annealing steps: 15 min ?
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ConclusionsConclusions
• Measurements @ -10°C after irradiation
• Annealing without envelopes !
• No dependence of stripvalues from bias conditions
• Next irradiations without bias ?