H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08 Status of the Silicon Strip Detector at CMS INSTR08 Novosibirsk, Feb08 Hans Jürgen Simonis Universität.

H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

Status of the Silicon Strip Detector at CMS

INSTR08

Novosibirsk, Feb08

Hans Jürgen SimonisUniversität Karlsruhe

On behalf of the CMS-Tracker Collaboration


CMS -- Compact Muon Solenoid


The CMS Si-Strip Tracker

200 m2 of active Silicon 15.100 Si Modules 75.000 APV FE chips 9.6 M readout channels 26 M wirebonds 37.000 Optical links

What is in this box?

Size:6m x 2.5m

required temperature: –10 °C on the Silicon surface(status september 07)


The Tracker Constituentshow is it organized?

SS Modules red

DS Modules blue(100 mrad stereo angle)

TOB (Tracker Outer Barrel)6 layers5200 modules

TID (Tracker Inner Disks)2x3 disks800 modules

TIB (Tracker Inner Barrel)4 layers2700 modules

TEC (Tracker EndCap)2x9 disks6400 modules

IP

z (mm)

r (mm)

Beam

hermetically closed systemtracking combines to outer Muon systemresolution of pt ~1.5% at 100GeV


Tracker Production: Modules

2700 TIB Modules

768 strips/sensor

6400 TEC Modules

800 TID Modules

10 different geometries

5200 TOB Modules

example: „stereo“-type

512 strips/sensor

R1 R2 R3R4

R5R6R7

TOB TEC

TIB TID


Tracker Production: TID

The free space between modules is covered with overlapping modules on the backside.Modules are directly mounted on the cooling pipes. one TID ready for mounting to TIB

we have 2 TIDs (z+ / z-) with 3 disks eacheach disk consists of 3 rings of moduleseach ring is mounted on a carbon fiber annulus

TID


Tracker Production: TIBThe Inner Barrel consists of 4 layers of modules (“shells”) at radii: (20 cm < r < 55 cm)

The 2 inner shells are equipped with double modules (stereo)

Each shell is produced in 4 large pieces: “half-shells” (2 for z+ and 2 for z-)

Modules are mounted with overlap in . (surface tilted wrt tangent)

Modules on inner and outer surface overlap in z.

Starting from shell-4, shells 3 - 2 - 1 are sequentially slid into the volume.

handling of components „on-shell“ is a delicate procedure Half of the TIB seen as a Matrjoschka (матрёшка)

shell: 4 3 2

TIB


Tracker Production: TOBThe Outer Barrel spans the region (55 cm < r < 116 cm) with 6 layersAgain, the 2 inner layers consist of double modules (stereo)A large CF support structure is loaded with 688 “rods” as sophisticated substructuresThe concept of rods (8 different types) allowed a distributed production scheme

Rod-genesis: frame + interconnectboard + 6(12) modules

The 2 outer layers were the first to be equipped with rods

TOB


Tracker Production: TEC

we have 288 Petals of 8 different

types, equipped with 19-27

modules

The 2 Endcaps consist of 9 Disks eachWedge-shaped modules form 7 concentric rings with all strips pointing to the beam axisRings 1,2 and 5 have double modules („stereo“-rings)„Petals“ represent the substructures which allow for distributed production

A fully equipped EndcapThe 16 Petals of Disk-1 can nicely be seen

TEC


Tracker Production:Just plug everything together

The support tube carries all the trackerelements and serves as thermal shield(with active cooling) towards the ECAL: -15º inside; +18º outside

The assembly took place in a largeclean room (TIF) where all aspects ofsystem tests could be performed

Tracker ready for transportation to CMS site, 20 km from CERN


ROD INTEGRATION

AachenKarlsruheStrasbourgZurichVienna

PETALS INTEGRATION Aachen

Brussels Karlsruhe

Louvain

Strasbourg

Vienna Lyon

TEC assemblyTEC assembly

Pitch adapter:Factories Brussels

TK ASSEMBLY CERN TIF

LouvainStrasbourgFirenze

Vienna

BariPerugia

Bari FirenzeTorinoPisaPadova

TIB-TID INTEGRATION

FNAL

UCSB

TOB assembly TIB/TID assemblyCERN Pisa Aachen Lyon@CERN

Karlsruhe

FNAL

Sensor QAC

Moduleassembly

Bonding & testing

Sub-assemblies

UCSB

FNAL

Integrationinto mechanics UCSB

Hamburg

Hybrids:Factory-Strasbourg

Sensors:Factories

Kapton:FactoryAachen, Bari

Frames:Brussels,Pisa,Pakistan

Pisa Perugia

FE-APV:Factory IC,RAL

Control ASICS:Factory Company (QA)

Brussels

HH

CERN

CF cuttingFactory

CF plates:FactoryBrussels

CF cuttingFactory

TorinoPisa

Move to Pit and Insert

Florence


Cosmics in the TIF – (Tracker slice test) (summer 2007, on surface, without magnetic field)

already large (~15%) Tracker System

• only Silicon Strip Tracker involved• 2161 modules – 24,75 m² active area• measurements at different temperatures down to -15°C• trigger rate 6.5 Hz ; 4.5 M events


Signal to Noise

TOB TIB

TIDTEC

Average value: S/N~30 for all subsystems

noise charge versus strip length; all TOB and TEC geometries

10 14 18 Strip length [cm]

n

oise

[e-

]

800

100

0

120

0


Tracking in TIFcosmics are rather different than pp-collisions special tracking algorithm has been developed module orientation not ideal (especially TEC and TID)

comparison of measured conditional track reconstruction

efficiencies (TIB/TOB)with simulations

1.2 1.3 1.4 1.5

1.2 1.3 1.4 1.5

1.04

1.00

0.96

0.92

1.04

1.00

0.96

0.92

Eff

icie

nc

y

polar angle

preliminary

TOB efficiency given a TIB track

TIB efficiency given a TOB track

DataSimulation


Status: Tracker insertion 16.12.2007


Installation Status Z- ; 25 Feb.2008Lots of Connections:• 980 pipes• 3347 fibers• 2330 cables

Z-

-9

-12

Sequence:→ Barrel fibres→ Pipe connection→ Pipe insulation→ Barrel cables→ TEC fibres→ TEC cables

-4

-2

-7

-8

-11

-15

-16

-17

-18

-6

-14

-13

-3 w

w

p

pp

W

w

p = partially done= in work

w

report from M. Eppard


Status Feb.25

• Tracker is in final position inside CMS with an accuracy of 1mm

• Fibers for Barrel, and almost all cooling pipes are connected

• Services for Endcap are the last to be finished• Beampipe installation foreseen mid-April• BUT! CMS-closure test interferes with Tracker

progress (in May)• Cosmic Runs (CRAFT) are foreseen until first

beam (June/July 2008)


SLHC: ~90 soft interactions superimposedon interesting event (could be ~200 oreven 400; depending on bunchstructure)

LHC: ~20 soft interactions superimposedon interesting event ( --> 1000 tracks/bc)

The upgrade of the LHC machine cannot be in energy, but in luminosity:1034 1035 [p / s • cm2]

The way how to reach that is not yet clear (12.5ns, 25ns, 50ns bunches, …)

Higher occupancy ~10000 tracks per bunch crossing! we need shorter strips more electronic channels more power requiredbut: tracker material budget is already at its limitsstudies on new supply schemes have started (cooling; DC-DC-converters etc)

About Detector upgrade (SLHC)

1035103510341034

(our silicon tracker will be dead after 10 years of LHC operation)


About Detector upgrade (II)

Higher irradiation Dose In inner region (r <~ 40 cm) we need new rad-hardsensor-material see RD50 activities (->Talk from G. Casse after lunch)

In the outer region existing material (p-in-n float zone) can possibly be used.n-in-p and / or Magnetic Czochralski are in discussion

But most challenging is the requirement that the SCMS-tracker has to contribute to the L1-trigger (detect high pt-tracks) we need a new Tracker design

several layouts are discussed:

3 Super-layers of stackeddoublets - M. MannelliPDPD

TIBTIBTOB

TOBExtra pixel layer,

bigger pixels, long pixels/short strips,

& 1-2 triggering layers - J. Nash


16. December 2007: Tracker in CMS


Backup Material


Silicon Sensors

Bias Voltage

p-in-n type silicon<100> – orientation1.5 – 3.2 kΩcm resistivity; 320 µm thickness4.0 – 8.0 kΩcm resistivity; 500 µm thickness


The Readout scheme

A Readout-hybrid with 4 APV chips Control branch(clock, trigger, …)

Data branch

amplify, shape and store


The Material budget

the contribution of different constituents is color-coded:

support

cooling

cables


Scint. Conf. B, Room Temp

Scints Conf. C,

Room Temp

10° 0° -10° -15°

TIB → StoN ~ 27; TOB → StoN ~ 31; TEC → StoN ~ 31

Signal / Noise for the different Tracker elements at various temperaturescorrected for incident angle


MTCC – MagnetTest and Cosmic Challenge (summer 2006, still in surface hall)

small Tracker system within CMS-Magnet

• all CMS-subsystems involved (incl. ECAL, HCAL, Myon-System)for Tracker:• 1% of electronic channels (~105) connected• 133 modules in total ( 0.75 m2 Si area)• 25 M events at different magnetic field values up to 3.8T• check of noise behavior• check software (readout, data handling, tracking algorithms)

4 TOB rods

2 TIB segments2 TEC petals


Petal assembly

H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08 Status of the Silicon Strip Detector at CMS INSTR08 Novosibirsk, Feb08 Hans Jürgen Simonis Universität.

Documents

tib modules

tid modules

z modules

tec modules

rings of modules

si modules

wedgeshaped modules

overlapping modules