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Status of the Silicon Strip Detector at CMS. INSTR08 Novosibirsk, Feb08. Hans Jürgen Simonis Universität Karlsruhe On behalf of the CMS-Tracker Collaboration. CMS -- C ompact M uon S olenoid. The CMS Si-Strip Tracker. What is in this box?. Size: 6m x 2.5m. - PowerPoint PPT Presentation
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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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
CMS -- Compact Muon Solenoid
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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)
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
Status: Tracker insertion 16.12.2007
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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)
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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)
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
16. December 2007: Tracker in CMS
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
Backup Material
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
The Readout scheme
A Readout-hybrid with 4 APV chips Control branch(clock, trigger, …)
Data branch
amplify, shape and store
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
The Material budget
the contribution of different constituents is color-coded:
support
cooling
cables
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
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
H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08
Petal assembly