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 Detectors [e] threshold charge I mage: L.Rossi / Pixel detectors: From fundamentals to applications single readout channel 3 Katie Dunne July 29, 2016
Threshold Scan Varying charge is injected ● Occupancy for each pixel at each charge ● forms a sigmoid curve Threshold s-curve mean Bad = same pixel threshold threshold value but at different inputs. Steepness-> different noise Bad Good values Wide range of inputs Inputs closer together Steepness noise Uniform noise 4 Katie Dunne July 29, 2016
Tuned Threshold Threshold cont’d Small width - most pixels within mean Threshold Mean ~800e 5 Katie Dunne July 29, 2016
Untuned Threshold Threshold cont’d Threshold Mean shifts Large width, chip-wide threshold can’t be described accurately 6 Katie Dunne July 29, 2016
Cold/Dry Box Several chips irradiated at Los ● Alamos National Lab in Spring 2016. Tested temp between 40°C and ● Temperature -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 FE65-P2 7 Katie Dunne July 29, 2016
Column Flavor 4 (RH+LCC) 20°C Tuning Column Flavor 4 (RH+LCC) -10°C 0 Mrad 0 Mrad 150 Mrad 150 Mrad 350 Mrad 350 Mrad Distributions Column Flavor 8 (LCC) 20°C Tuning Column Flavor 8 (LCC) -10°C 8 Katie Dunne July 29, 2016
Results: Threshold Shift 9 Katie Dunne July 29, 2016
Results: Detuning 10 Katie Dunne July 29, 2016
88” Cyclotron Irradiation June 2016 Irradiation Device installed in ● temperature and humidity secure box Ran for ~8 hours in 50 Mev ● proton beam at -10°C Beam Beam was stopped ● periodically then threshold Cold scans were taken Box Reached ~1.3 Mrad dose ● HL-LHC will reach 1 Mrad in ● 1 run (~10 hours) 11 Katie Dunne July 29, 2016
Results: Threshold Shift Retuned at 1 Mrad Effect from temp increase to 20°C 12 Katie Dunne July 29, 2016
Results: Detuning Effect from temp increase to 20°C Retuned at 1 Mrad 13 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 ● Results 14 Katie Dunne July 29, 2016
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