PhD Progress ReportCharacterisation, irradiation and design optimisation of silicon micro-strip modules for
the ATLAS Phase-II tracker upgrade
First Year
04/05/2017Edoardo Rossi
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ATLAS Authorship Qualification Task
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Introduction
> Beam cleaning losses: originates from protons that are lost on limiting apertures, typically the tertiary collimators (situated 150 m from the IP)
> Interaction beam-gas: elastic (small deflections, effects similar to TCT losses) or inelastic (showers of secondary particles with production of a few high energy muons)
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Space Points vs. Clusters (Z Asymmetry)
The Z asymmetry using the space points is larger and cleaner
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Mapping With Space Points
Clusters essentially provide a 1-dimensional measurement, while Space Points provide 2-dimensional points with granularity of the order of 10x10 μm2:
using Space Points we can map the Beam Induced Background in the SCT
Run 298771 (pressure bump at 150 m), LB 267 Beam C-A, End-cap A, Disk 6
Transition between inner and middle modules: they are separated by 3.5 mm
Transition between middle and outer modules: they overlap for 16.5 mm
The BIB density decreases linearly with the radius
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Mapping With Space Points
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ITk Strip Test Beam Analyses
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Testbeams and Devices Under Test (DUTs)
DUT Name FacilityMonth
Strip Length Irradiated?
Full Barrel Module LS4 DESYMay
5 and 2.5 cm No
End-Cap DAQLoad13 DESYMay
1 cm Sensors: neutrons @ 2 ∙ 1015 neq
/cm2
ASIC: one unirrad., one X-rays @ 4 Mrad
Full Barrel Module LS3 CERNJuly
5 and 2.5 cm Protons @ 7.8 ∙ 1014 neq
/cm2
Not annealed
Long Strips (5 cm)
Hybrid with 10 ABC130 (ATLAS Binary Chip)
Short Strips (2.5 cm)
n+ on p technology (electron signal)Pitch = 74.5 μmThickness = 300-320 μmBinary Read-out (3 time bins)
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Test Beam Plots in the TDR
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Test Beam Plots in the TDR
● Test beam curves obtained using only particles passing at less than 15 μm from the center of a strip (only leading strip)● Source curves obtained considering the total charge in a cluster
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Test Beam Plots in the TDR
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Test Beam Plots in the TDR
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Charge (efficiency) loss at the interstrip position
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Bond Pad Region
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Looking back at analog (Alibava) test beams
Multiple scattering of soft (MeV) electrons in the silicon. Leading strip behavior not analyzable with sources (with 300 μm thickness)
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Leading Strip Anomaly
~20% of the leading strip spectrum extends to lower charges with respect to the expected Landau distribution
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Leading Strip Anomaly (Annealing)
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Leading Strip Anomaly (Bias Voltage)
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Plans for the Future
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Varying Implant Sensors
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Varying Implant Sensors
> Sensors have been ordered (they will arrive in the summer)
> Probe station measurements
> Irradiation (protons and neutrons, mixed irradiation if we have enough sensors)
> Probe station measurements after irradiation
> Edge TCT
> Test beam(s) with analog (Alibava) read-out
> Lorentz angle data
In the meanwhile...
> Internal note on test beam work
> Learn TCT
Par
alle
l
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Talks and Schools
> Talk at the ATLAS Upgrade Week (15/11/2016, CERN)
Results from the ITk Strip 2016 Test Beams
> Contribution to a talk at Testbeam workshop (27/01/2017, Barcelona)
> Talk at the DPG (29/03/2017, Munster)
Test Beam Results of an Unirradiated and an Irradiated Prototype Module for the ATLAS ITk Strip Detector
> Attended the Terascale Detector Workshop (10-13/04/2017, DESY)
Planned
> Applied for the 2017 European School of HEP (6-19/09/2017, Portugal)
> Pier courses on writing and presenting in Academia
> Conference (NSS or similar)
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Leading Strip Anomaly
~20% of the leading strip spectrum extends to lower charges with respect to the expected Landau distribution
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Leading Strip Anomaly
~20% of the leading strip spectrum extends to lower charges with respect to the expected Landau distribution
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Pulse Shapes
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