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1Dirk Wiedner
Straw Detectors for the Large Hadron Colider
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Tracking with Straws
p pbd
π
Straw detector?B-Field →Track
/Momentum!
S
N
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LHCb
Straw Detector:Impact of charged particles
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LHCbRICHES: PID K, separation
Calorimeter:PID: e,, 0
Myon System
VELO:• primary+secundaryVertex• Impactparameter
Trigger Tracker:p for Trigger
Straw Detector:impact of charged particles
Particle identification:
Spursystem:
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Specifications
The Goal:
momentum resolution
δp/p = 0.4% or 200mThe conditions:
40 MHz collision rate
system clock
1 bunch crossing in 25 ns
1.1 MHz Readout
B-hadron productionrate 75 kHz
radiation @ readout 10 kRad
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How do we meet the specs?
350 m2 of Straw detectors, 114 m2 made in HD
each module 34 cm x 5 m
high precision ~100 m
light & tight
Readout electronics from HD:
Time to Digital Converters for < 1ns precision
1ns ~ 60 mFiber optical readout with 650 GBit/s
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Straw Outer Tracker
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Straw Detector Production
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Status of module production in HD
Module 40 produced. Total of 67 modules will be built until end of the year.
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Quater Station
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Straw Readout Electronics
Preamp
PreampTDC
Preamp
PreampTDC
Preamp
PreampTDC
Preamp
PreampTDC
opticalTransmitte
rboard
Frontendbox
Readoutboardoptical
Receiver board
Switch
PC PC PC PC PC
opticalReceiver board
stra
w m
odul
128
cha
nnel
s
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Readout window
TDC (OTIS)
TDC = Time to Digital Converter
LHC clock (40 MHz)
Signal from Preamp
T coded 2+6 Bit
Readout 32 channels One Timebin corresponds 25 ns / 64 ≈ 390 ps Time always in respect to interaction time (LHC time) Readout window: 75 ns
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optical Transmitter board
1.6 Gbit/s throughput
1 fiber per straw module
Distribution of Fast- and Slow Control
Jitterfilter (≤7ps RMS)
Low voltage regulators
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optical Receiver board
12 optical inputs
19,2 Gbit/sPart of LHCb readout board(TELL1)
288 parallel electrical outputs
Bit error rate < 10-15
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The Test:
4 Modules from the production
final electronics
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The Proof
reso
luti
on [
μm]
200 μm
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Summary
68 m2 (60%) of straw modules produced in Heidelberg
TDC and optical readout electronics developed in Heidelberg
200 μm resolution well surpassed in full system test
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Schema
optischeEmpfänger-
karte
PC
Stratix
TTC
Szin
till
ator
Mod
ul 4
I²C + Laptop
Szin
till
ator
Mod
ul 3
Mod
ul 2
Mod
ul 1
FE-Box
FE-Box
Si-Teleskop
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Strahlprofil
Elektronenstrahl 7GeV
Strahlbreite 5cm
8 Lagen je 64 Straws ausgelesen
Triggerrate 1kHz
Rauschen <0.3 %
Kanal
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Erste Teststrahlergebnisse
Driftzeiten maximal 50 ns
Effizienz >94%
(ohne Akzeptanzkorrektur)
Auflösung besser 250 µm (vorläufig)
Auslesekette funktioniert von Straw bis PC
ns
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Vorverstärker
ASDBLR (ATLAS DEMILL)
Vorverstärker mit ca. 12 ns Integrationszeit
2x 8 Kanäle pro Karte
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Linearitätsmessung
Hit Delay [ns]
Dri
ftti
me
[bin
ary]
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Frontendbox
optische Senderkarte
TDC Karten
Vorverstärker
WasserkühlungLeistungaufnahme
20W
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Auslesekarte/L1-Buffer
Daten von 24 Halbmodulen
LHCb-weiter Standard
Aufgaben:
Deserialisierung
Synchronisation
Prozessierung
Speicher (60 ms = 65k Ereignisse)
Ethernet Datenausgabe zu L1-Trigger und DAQ