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
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
The ATLAS Pixel Detector
A CERN Summer Student’s-Eye View
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
SLAC, USA Cerne Abbas Man, UKStone Henge, UKWhite Horse, UK
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Where is the Pixel Detector?1.3m long, 33cm diameter, 1.7m2 active detector area
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
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)
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Silicon Detectors – The Basics
n-type Silicon
p-type Silicon
Depletion Zone
Induced Electric
Field
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
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
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
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
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
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
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
My Project – The Solution
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:
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
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
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
Actual Use of the Test System
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.
CERN Summer School15th August 2006
Tom WhyntieUniversity of Cambridge
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!