commissioning results of the d Ø tracking system
DESCRIPTION
Commissioning Results of the D Ø Tracking System. Design Installation and Commissioning Tracking/Vertexing Results. Harald Fox Northwestern University May 24, 2002. Chicago . p. p. 1.96 TeV. Booster. p. CDF. DØ. Tevatron. p. p sou rce. Main Injector & Recycler. - PowerPoint PPT PresentationTRANSCRIPT
DD
Commissioning Results of the Commissioning Results of the DDØØ Tracking System Tracking System
Harald Fox
Northwestern University
May 24, 2002
Design Installation and
Commissioning Tracking/Vertexing
Results
DD
DPF 2002 H. Fox 2
The Fermilab Tevatron Collider
Main Injector & Recycler
Tevatron
Chicago
p source
Booster
p
p
p p
1.96 TeV
CDF
DØ
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DPF 2002 H. Fox 3
Calorimeters Tracker
Muon System
Beamline Shielding
Electronics
protons
20 m
antiprotons
The DØ Detector
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DPF 2002 H. Fox 4
Tracker Design
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DPF 2002 H. Fox 5
SMT Design
4-layer barrel cross-sectionBarrels F- Disks H- Disks
sngl/dbl sngl + dbl double single
Stereo 0, 2, 90 +/ -15 +/ -7.5
Channels 387072 258048 147456
Modules 432 144 96
Rin/Rout 2.7/ 9.4cm2.6/ 10.5cm 9.5/ 26cm
6 Barrels
12 F Disks
4 H Disks
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DPF 2002 H. Fox 6
SMT Design
Require good 3D track reconstruction performance for high-pT (top, Higgs, EW, NP) and low-pT (B) tracks out to || < 3Momentum resolution less than 10% at pT = 1 GeV/cImpact parameter resolution within 30 m
Forward H disks are employed to achieve these resolutions at high ||
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DPF 2002 H. Fox 7
SMT Readout Electronics
Interface BoardsRefresh signals and adjust timingPower management and monitoring
SEQencersManagement of SVXConversion to fiber optics
VRB (VME Readout Buffer)
Data buffer pending L2 trigger decision~ 50 Mb/s/channel5-10 kHz L1 accept 1 kHz L2 accept rate
Pipeline Control Logic
Analog Pipeline:
128 channel
32 cells
128
In
teg
rato
rs
AD
C C
om
par
ato
rs
Sp
arsi
fic
atio
n F
IFO
I/O
ADC ramp and
counter
Analog section Digital section
To
Sil
ico
n D
etec
tor
To
Re
ado
ut
Sy
stem
SVX IIe Chip128 channel, 32 pipeline cells8 bit ADC with sparsification106 MHz digitization, 53 MHz readoutRadiation hardDeveloped by LBL/Fermilab group
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DPF 2002 H. Fox 8
CFT Design
8 layers of axial and 3° stereo fibers mounted on carbon fiber support cylinders.20cm < r < 51cm.
76,800 individual fibers.Diameter: 835μm. Length: 1.8/2.6m.The interlocked fibers are precisely positioned. Hit resolution about 100μm.
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DPF 2002 H. Fox 9
CFT Readout Electronics
High gain: 17k – 65k e per photonAFE boards provide
Bias voltageTemperature controlFast digital trigger informationAnalog pulse information (SVX)
SEQ + VRB readout as SMT
~8-11m long wave-guides to Visible Light Photon Counter (VLPC, solid state photo multiplier).VLPCs are operated at 9K. Quantum efficiency: 80%. 1 mip ~ 8 photo electrons: Excellent S/N!
0 pe
2 pe
3 pe4 pe
1 peLED Calibration
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DPF 2002 H. Fox 10
Low Mass Cables
Installation
Fiber tracker installation Cylinder installation was completed on 12/20/00
A ½ cylinder of 3 barrels and 6 F disks was inserted into each end of the CFT bore
H Disk installation was completed on 2/6/01The cabling (~15,000 connections) and electronics installation was completed in May 2001Axial Fiber Tracker electronics installed in November 2001Stereo electronics completed April 2002
SMT cylinder
Calorimeter
High Mass Cables SMT
Interface Boards
Wave guides
Cryostat with AFE boards
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DPF 2002 H. Fox 11
SMT Charge Collection
Cluster charge (corrected for track angle): 1 mip ~ 25 ADC counts. Noise < 2ADC counts.
p-side pulse-height (ADC)
n-si
de p
ulse
-hei
ght
(AD
C)
Charge correlation between p- and n-side of a detector
p-side pulse-height (ADC)
Lorentz angle: The charge deflection due to the magnetic field
fract
ion
of1
strip
clu
ster
s
Local track incidence angle
φL =4.5°
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DPF 2002 H. Fox 12
CFT Commissioning
Light yield per sector vs pseudorapidity η
Zee candidate event.Mass 89.9GeV/c2
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DPF 2002 H. Fox 13
Tracking and Vertexing
DCA
track
x
y
Impact parameter resolution SMT track
CFT track
CFT-SMT track matching
Vertex measurements
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DPF 2002 H. Fox 14
Physics Results
We candidates
ET(cluster)/pT(track)
E/p for Weν candidates KS π+π- cand.
First evidence for B decaysJ/Ψ μ+μ- candidates
Z μ+μ- cand.
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DPF 2002 H. Fox 15
Conclusions
DesignThe DØ tracking detectors are designed to have a good impact parameter resolution over a wide range of η.
CommissioningThe SMT was the first major DØ Upgrade detector system fully operational for Run 2A. About 95% of the channels are available for readout.
ResultsCalibration, beam measurement, and alignment results are looking promising.Physics results coming in.Noise studies, tracking refinements, etc. continue.
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DPF 2002 H. Fox 16
The work of many people...
…thanks to all of them.
The DØ Collaboration
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DPF 2002 H. Fox 17
Data p-side
5.4L
Lorentz angle
Lorentz angle is different for p- and n-sides Lorentz shift is not visible for 90 deg stereo stripsLorentz shift is large for 2 deg stereoLorentz angle can be measured in local phi distribution for one strip clusters
Measurement is NOT affected by alignment or reconstruction
L
h+
e-
P-side (axial)
Phi distribution for one strip clusters
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DPF 2002 H. Fox 18
SMT Design: Stereo Angles
Ladders3-chip: 72 single-sided, axial ladders in the two outer barrels6-chip: 144 double-sided, axial/90° ladders in the four inner barrels9-chip: 216 double-sided, axial/2° ladders in all barrels
WedgesF Disks: 144 double-sided, ±15°, 6+8 chip wedgesH Disks: 96×2 back-to-back single-sided, ±7.5°, 6 chip wedges
9-chip ladder9-chip ladder
H wedgeH wedge
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DPF 2002 H. Fox 19
Production & Assembly: Testing
Probe TestDebug bad strips (broken capacitors), bonds, chips, etc.Determine the V-I characteristics of the sensorsMeasure V-max p-side breakdown voltage (micro-discharge effect)
Burn-inBias the ladder or wedge and test the readout for 72 hoursMeasure pedestals, noise, gain and check sparse readout
LaserExpose biased detectors to a narrow laser scanMeasure the depletion voltage and leakage currents and identify dead channels
Readout tested again after the detector has been mounted.
V-max
Fail
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DPF 2002 H. Fox 20
SMT Readout: Data Flow
PlatformPlatformPlatformPlatform
SEQ
SEQ
SEQ
SEQ
SEQ
SEQ
3/6/8/9 Chip HDI
Sensor
8’ Low Mass Cable
VRB Controller
Optical Link1Gb/s
V
B
D
V
R
B
V
R
B
V
R
B
68k/PwrPC
Bit3
PC
SDAQL3MPM
VME
1553
HV / LV
Adapter Card
I,V,T Monitoring
KSU
Interface Board
25’ High Mass Cable (3M/50 conductor)
CLKs CLKs
SEQController
Serial Command Link
~19’-30’ High Mass Cable (3M/80 conductor)
Detector volumeDetector volumeDetector volumeDetector volume
Counting HouseCounting HouseCounting HouseCounting House
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DPF 2002 H. Fox 21
Alignment: Residuals
SMT-only tracking with at least 4 hitsMagnet off dataSimilarity of residuals from reconstruction with ideal and survey geometries indicates excellent internal alignment of the SMT
Ideal GeometryIdeal Geometry Survey GeometrySurvey Geometry