the atlas pixel detector
DESCRIPTION
The ATLAS Pixel Detector. A CERN Summer Student’s-Eye View. SLAC, USA. Cerne Abbas Man, UK. Stone Henge, UK. White Horse, UK. Where is the Pixel Detector?. 1.3m long, 33cm diameter, 1.7m 2 active detector area. Pixel Detector Requirements. Spatial resolution: 10 m m - PowerPoint PPT PresentationTRANSCRIPT
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
The ATLAS Pixel Detector
A CERN Summer Student’s-Eye View
![Page 2: The ATLAS Pixel Detector](https://reader035.vdocument.in/reader035/viewer/2022062323/568152a2550346895dc0c75b/html5/thumbnails/2.jpg)
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
SLAC, USA Cerne Abbas Man, UKStone Henge, UKWhite Horse, UK
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Where is the Pixel Detector?1.3m long, 33cm diameter, 1.7m2 active detector area
![Page 4: The ATLAS Pixel Detector](https://reader035.vdocument.in/reader035/viewer/2022062323/568152a2550346895dc0c75b/html5/thumbnails/4.jpg)
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Pixel Detector Requirements
• Spatial resolution: 10m• Temporal resolution: 25ns• Radiation hardness: 3 x 1014 cm-2 NE per year
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Silicon Detectors – The Basics
n-type Silicon
p-type Silicon
Extra electrons
(V)
Extra holes (III)
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Silicon Detectors – The Basics
n-type Silicon
p-type Silicon
Depletion Zone
Induced Electric
Field
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Silicon Detectors – The Basics
n-type Silicon
p-type Silicon
Depletion Zone
Applied Voltage
Reverse biased pn-junction
Active Detector
Area
![Page 8: The ATLAS Pixel Detector](https://reader035.vdocument.in/reader035/viewer/2022062323/568152a2550346895dc0c75b/html5/thumbnails/8.jpg)
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Silicon Detectors – The Basics
n-type Silicon
p-type Silicon
Depletion Zone
Applied Voltage
Active Detector
Area
![Page 9: The ATLAS Pixel Detector](https://reader035.vdocument.in/reader035/viewer/2022062323/568152a2550346895dc0c75b/html5/thumbnails/9.jpg)
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Silicon Detectors – The Basics
n-type Silicon
p-type Silicon
Depletion Zone
Applied Voltage
Active Detector
Area
To readout
![Page 10: The ATLAS Pixel Detector](https://reader035.vdocument.in/reader035/viewer/2022062323/568152a2550346895dc0c75b/html5/thumbnails/10.jpg)
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
The Pixel Module
1744 modules ~ 80 million pixels!
Silicon sensor
“Bump bonds”
Circuit board
Module Controller Chip (MCC) Front End (FE)
electronics chips:
160 x 18 = 2889 pixels per chip
16 chips per module
2D array of sensors
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
What Does a Pixel Module Need?
High Voltage (HV) supply – depletes the
silicon
600V
Low Voltage (LV) supplies –
powers the FE electronics
2.5 V
Da
ta
Opto board supplies
2 V
Temperature sensor resistor (NTC) readings
For Interlock
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
$
$$ $ $
$ $$
My Project – The Problem1. Pixel modules are expensive
2. Supply kit can be badly designed / made• Need a “module substitute”
3. Number of supply lines: ~7500
Test Box
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
My Project – The Solution
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
The Implementation
Low Voltage(LV)
WienerPower Supply
LV PP4 LV
High Voltage(HV)
ISEGPower Supply
HV PP4 HV
PP2
RegulatorBoard
NTC /Optoboard
SCOLinkPower Supply
NTCOpto
PP3•OPTO•BBM•BBIM
HV Power (VDET)
LV Power
Opto Power
VISET, VPIN, OPTO_RST
NTC, NTC_OPTO
Sense lines
VVDC
VDD, VDDA
NTC linesInterlock
Opto Power
Type IV Type III Type IICabling:
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
The Implementation
Keithley 7708 40 Channels
Keithley 7708 40 Channels
Keithley 2700 Scanning DMM
Max 300V
HV Test Box
HV
26 x VDET2 x SAFE2 x DRAIN
AWG26(from LEMO cable)
HV Test Box
HV
26 x VDET2 x SAFE2 x DRAIN
AWG26(from LEMO cable)
HV Test Box
HV
26 x VDET2 x SAFE2 x DRAIN
AWG26(from LEMO cable)
26 x VDET
13 x VDET
13 x VDET
26 x VDET
AWG22(for7708 screw terminals)
PC
DCS
GPIB
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
The Implementation
Scanning DMM
2 x Keithley 71662 x 1 x 10 Channels
Keithley 7001 Switching Matrix
Agilent N3300AActive Load Mainframe
5 x Agilent N3302A: Load Modules
Keithley 7001 Switching Matrix
Keithley 7011S4 x 1 x 10 Channels
LV
7 x VDD7 x VDDA1 x VVDCAWG26
(LEMO cable)
7 x SENSE_VDD7 xSENSE_ VDDA1 x SENSE_VVDC
13 x NTC2 x NTC_OPTO
6 x Opto Voltages
13 x NTC2 x NTC_OPTO
2 x VISET2 x VPIN
2 x OPTO_RSTNTC/OptoTest Box
NTC/Opto
AWG22(recommended)
AWG26(LEMO cable)
Resistors(Type 0 and 1 cables)
7001’s, Agilent and Scanning DVM connect to PC (via GPIB), which then connects to the DCS…• Challenges:
Physical• Connections
• Test Conditions
SimulationAutomation
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Actual Use of the Test System
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Conclusions• Outcomes for CERN:
Pixel Services Test System designed Will be implemented in near future;
At least the Pixel Detector will work
• Outcomes for me:• Not massively physics-based…• But learnt a lot about everything else.• Appreciation of the scale of CERN
• Engineering effort, collaborations, etc.
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
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CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
• Acknowledgements: CERN
The Summer Student team – thanks for a great programme! ATLAS Pixel Detector Group
• Kevin Einsweiler (LBNL), Project Leader Sidney Sussex College, University of Cambridge And last, but not least…
• Markus Keil (CFTP Lisbon), Summer Project Supervisor
Thanks for listening!