1Dirk Wiedner

Straw Detectors for the Large Hadron Colider

2Dirk Wiedner

Tracking with Straws

p pbd

π

Straw detector?B-Field →Track

/Momentum!

S

N

3Dirk Wiedner

LHCb

Straw Detector:Impact of charged particles

4Dirk Wiedner

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:

5Dirk Wiedner

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

6Dirk Wiedner

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

7Dirk Wiedner

Straw Outer Tracker

8Dirk Wiedner

Straw Detector Production

9Dirk Wiedner

Status of module production in HD

Module 40 produced. Total of 67 modules will be built until end of the year.

10Dirk Wiedner

Quater Station

11Dirk Wiedner

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

12Dirk Wiedner

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

13Dirk Wiedner

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

14Dirk Wiedner

optical Receiver board

12 optical inputs

19,2 Gbit/sPart of LHCb readout board(TELL1)

288 parallel electrical outputs

Bit error rate < 10-15

15Dirk Wiedner

The Test:

4 Modules from the production

final electronics

16Dirk Wiedner

The Proof

reso

luti

on [

μm]

200 μm

17Dirk Wiedner

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

18Dirk Wiedner

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

19Dirk Wiedner

Strahlprofil

Elektronenstrahl 7GeV

Strahlbreite 5cm

8 Lagen je 64 Straws ausgelesen

Triggerrate 1kHz

Rauschen <0.3 %

Kanal

20Dirk Wiedner

Erste Teststrahlergebnisse

Driftzeiten maximal 50 ns

Effizienz >94%

(ohne Akzeptanzkorrektur)

Auflösung besser 250 µm (vorläufig)

Auslesekette funktioniert von Straw bis PC

ns

21Dirk Wiedner

Vorverstärker

ASDBLR (ATLAS DEMILL)

Vorverstärker mit ca. 12 ns Integrationszeit

2x 8 Kanäle pro Karte

22Dirk Wiedner

Linearitätsmessung

Hit Delay [ns]

Dri

ftti

me

[bin

ary]

23Dirk Wiedner

Frontendbox

optische Senderkarte

TDC Karten

Vorverstärker

WasserkühlungLeistungaufnahme

20W

24Dirk Wiedner

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