SLIDE 1
FE65-P2
2 Quad Columns per flavor (8x64 pixels) Analog Islands (2x2 pixels) Digital Sea
Katie Dunne July 29, 2016
64 x 64 Pixels
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FE65-P2 Threshold Stability for ATLAS Pixel Layer Upgrade Katie - - PowerPoint PPT Presentation
FE65-P2 Threshold Stability for ATLAS Pixel Layer Upgrade Katie - - PowerPoint PPT Presentation
FE65-P2 Threshold Stability for ATLAS Pixel Layer Upgrade Katie Dunne July 29, 2016 Analog Islands (2x2 pixels) FE65-P2 64 x 64 Pixels 2 Quad Columns per Digital Sea flavor (8x64 pixels) 2 Katie Dunne July 29, 2016 Hybrid Pixel
SLIDE 2
SLIDE 3
Katie Dunne July 29, 2016
Hybrid Pixel Detectors
single readout channel
Image: L.Rossi / Pixel detectors: From fundamentals to applications
[e]
threshold charge
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SLIDE 4
Threshold
Katie Dunne July 29, 2016
Threshold Scan
- Varying charge is injected
- Occupancy for each pixel at each charge
forms a sigmoid curve Bad
same threshold value but at different inputs. Steepness-> different noise values
Bad
Wide range of inputs Steepness noise
Good
Inputs closer together Uniform noise
s-curve mean = pixel threshold
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SLIDE 5
Threshold cont’d
Tuned Threshold
Small width - most pixels within mean Threshold Mean ~800e Katie Dunne July 29, 2016
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SLIDE 6
Katie Dunne July 29, 2016
Threshold cont’d
Untuned Threshold
Large width, chip-wide threshold can’t be described accurately Threshold Mean shifts
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SLIDE 7
Temperature
Katie Dunne July 29, 2016
- Several chips irradiated at Los
Alamos National Lab in Spring 2016.
- Tested temp between 40°C and
- 40°C
○
HL-LHC operating temps won’t vary much around -7°C
- Temp tests on 2 chips irradiated
to ~150 Mrad and ~350 Mrad
Cold/Dry Box FE65-P2
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SLIDE 8
Distributions
0 Mrad 150 Mrad 350 Mrad
Katie Dunne July 29, 2016 Column Flavor 4 (RH+LCC) 20°C Tuning Column Flavor 4 (RH+LCC) -10°C Column Flavor 8 (LCC) -10°C Column Flavor 8 (LCC) 20°C Tuning
0 Mrad 150 Mrad 350 Mrad
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SLIDE 9
Results: Threshold Shift
Katie Dunne July 29, 2016
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SLIDE 10
Results: Detuning
Katie Dunne July 29, 2016
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SLIDE 11
88” Cyclotron Irradiation
- Device installed in
temperature and humidity secure box
- Ran for ~8 hours in 50 Mev
proton beam at -10°C
- Beam was stopped
periodically then threshold scans were taken
- Reached ~1.3 Mrad dose
- HL-LHC will reach 1 Mrad in
1 run (~10 hours)
Beam Cold Box
June 2016 Irradiation
Katie Dunne July 29, 2016
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SLIDE 12
Results: Threshold Shift
Katie Dunne July 29, 2016 Retuned at 1 Mrad Effect from temp increase to 20°C
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SLIDE 13
Results: Detuning
Katie Dunne July 29, 2016 Retuned at 1 Mrad Effect from temp increase to 20°C
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SLIDE 14
Results
Katie Dunne July 29, 2016
Table of rates taken from linear fit of data from 20°C to -20°C
- Flavors with similar features averaged together
- August irradiation will give more information
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