the cms tracker upgrade for hl-lhc - indico.cern.ch
TRANSCRIPT
The CMS Tracker Upgrade for HL-LHC SUDHA AHUJA (ON BEHALF OF THE CMS COLLABORATION)
SPRACE-UNESP, BRAZ IL
Overview
HL-LHC&CMS
TrackerforHL-LHCq Innertracker
◦ Specifica8ons◦ Modules
q OuterTracker◦ pTmodules◦ L1TrackFinding
Performanceresults
Summary
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Highpileupeventwith78reconstructedver5ces(pp)
High Luminosity-LHC & CMS
ForHL-LHC,CMSrequiresupgradeofitsECAL,HCAL(frontendelectronics),Muonchambers,L1triggerrate&latency,newSiliconbasedHighGranularityCalorimeter&aCompleteReplacementoftheTracker
CurrentCMStrackerq Needsimprovedradia8onhardness(upto3000Z-1)q Higherdetectorgranularity(reduceoccupancy)q Improvedtriggercapability:u8lizehighpTtracksfromtrackerforL1trigger(acceptablerates)q Increaseinbandwidthq Op8mizedesignforcoveringphysicsgoals-extendetacoverage(forwardregion),reducematerialbudget(be^erresolu8on)
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RunI7-8TeV
7x1033cm-2s-121pileup301-1
RunII13TeV
1x1034cm-2s-127pileup~1501-1
HL-LHC14TeV
5-7.5x1034cm-2s-1140–200pileup
30001-1
RunIII14TeV
2x1034cm-2s-150pileup3001-1
Construc5onandcommissioningofthePhaseIupgradeoftheCMSpixeldetector–R.BartekPerformanceandtrack-basedalignmentoftheupgradedCMSpixeldetector–V.BoPa
2010-20132016-20182021-20232024&beyond.....
MoredetailsaboutthecurrentTracker:
Phase II Tracker for CMS
ExtendedEtacoverageintheforwardregion(upto4.0)
InnerTrackerq 4.9m2,2x109pixels,twotypesofhybridpixelmodules:1x2chips(1960)and2x2chips(2392)q Shorterbarreldetector(reducesmaterialbudget)
OuterTrackerq ThreelayersofPSmodules:provideaccuratezcoordinate(TBPS),par8ally8lted(innerbarrel)tomi8gatestubinefficiencyq 13296modules(7680(2S)&5616(PS)),192m2,42Mstrips,170Mmacro-pixels(25m2)
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2S(OT)
PS(OT)
IT
TB2S
TBPSTEDD
BPIX FPIX
Material budget
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Significantreduc8oninmaterialaroundeta~1.5
η0 0.5 1 1.5 2 2.5 3 3.5 4
0x/
X
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6 In front of IT sensors
Inside IT tracking volume
Between IT and OT
Inside OT tracking volume
Phase-2 Tracker
η0 0.5 1 1.5 2 2.5 3 3.5 4
0x/
X
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6 In front of IT sensors
Inside IT tracking volume
Between IT and OT
Inside OT tracking volume
Phase-1 Tracker
Phase II Tracker (Inner Tracker)
ExtendedEtacoverageintheforwardregion(upto4.0)
InnerTrackerq 4.9m2,2x109pixels,twotypesofhybridpixelmodules:1x2chips(1960)and2x2chips(2392)q Shorterbarreldetector(reducesmaterialbudget)
OuterTrackerq ThreelayersofPSmodules:provideaccuratezcoordinate(TBPS),par8ally8lted(innerbarrel)tomi8gatestubinefficiencyq 13296modules(7680(2S)&5616(PS)),192m2,42Mstrips,170Mmacro-pixels(25m2)
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2S(OT)
PS(OT)
IT
TB2S
TBPSTEDD
BPIX FPIX
Inner Tracker
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Factorof6reduc8oninpixelareaq Lowoccupancy,improvedtracksepara8on
TEPXprovidesluminositymeasurement
Extractable(poten8altoexchangedegradedparts,ifrequired)
Narrowpitch&highgranularityq 50x50or25x100μm2cellsize
Dealswithhighradia8onlevels&hitrates Twotypesofmodules(similartoPhaseI)
q Herme8carrangementinendcaps
Sensortechnologies(n-in-p)q PlanarSiliconpixelsensorsfortheouterlayers(thickness:
100-150μm)q 3Dsiliconsensorsforinnerlayers(alterna8veop8on),for
TBPXandring1inTFPX
1X2(PROC)PixelRead-outChips
(Innerlayers)
2X2PROC(Outerlayers)
Phase II Tracker (Outer Tracker)
ExtendedEtacoverageintheforwardregion(upto4.0)
InnerTrackerq 4.9m2,2x109pixels,twotypesofhybridpixelmodules:1x2chips(1960)and2x2chips(2392)q Shorterbarreldetector(reducesmaterialbudget)
OuterTrackerq ThreelayersofPSmodules:provideaccuratezcoordinate(TBPS),par8ally8lted(innerbarrel)tomi8gatestubinefficiencyq 13296modules(7680(2S)&5616(PS)),192m2,42Mstrips,170Mmacro-pixels(25m2)
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2S(OT)
PS(OT)
IT
TB2S
TBPSTEDD
BPIX FPIX
pT module concept Hitpairs(“Stubs“)senttoback-endformL1tracksq Combinedwithcalorimeter&muoninforma8onq Eventreadoutat~750KHz(alerL1decision
making)q L1Tracksreconstructedfrom10Kstubswithin4μs
latencybudget
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OuterTrackerdesigndrivenbyimplementa8onoftrackfindingatL1
EnablespT-discrimina8onfortracksinthestrongCMSmagne8cfieldq Correla8nghitpa^ernsin2closelyspacedsensorstofilterhighpTtracks(≥2GeV/c)
q Datareduc8onbyafactorof10-100q Transmi^edat40MHzBXfrequencytoL1
(GeV)T
Particle p0 1 2 3 4 5 6 7 8 9 10
Stub
effic
iency
0
0.2
0.4
0.6
0.8
1
TBPS layer 1TBPS layer 2TBPS layer 3TB2S layer 1TB2S layer 2TB2S layer 3
CMS Phase-2 Simulation √s=14TeV, Muons, 0 PU
Modules for Outer Tracker
Sensors:n-in-pplanartechnology
Radia8onhardsensormaterials;thinnersensors(200μm)
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PSmoduleSensorsize:5cmx10cm
2x960strips;32x960macro-stripsStrip(Topsensor):2rows2.3cmlongMacro-pixels(Bo^omsensor):1467μm
long(goodzresolu8on)Pitchof100μm(both)
Read-out:SSA+MPAchip
2SmoduleSensorsize:10cmx10cm
2x1016strips(both)Stripdimension:5cmlong(2rows
persensor)Pitchof90μm
Read-out:2xCBCchip
Highestoccupancy~3%inLayer1StripsDropateta~1.5(5ltedgeometry)
Outer Tracker: Front End Electronics
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Useofacommondatatransfersystem,basedonLpGBT
Technologies,architectures,anddataformatskeptsimilarforbothsystems(PS&2S)
Dedicatedread-outASIC’sforbothq CBC(2S)&SSA+MPA(PS)
Commonaggregatorchip(ConcentratorIntegratedCircuit,CIC)q Blocksynchronous(8BX)transmissionofstubdataq Sparsifiedtransmissionofreadoutdata@750kHz
Front-end Back-end
abcdefghi
L1 Track Trigger Threeapproachesunderinves8ga8ondifferinginPa^ernRecogni8on(PR)techniques(usingpowerfulFPGAbasedsystems)q Associa8veMemoryASIC’s+FPGA,FPGAbasedHoughtransform&FPGAbasedTracklet
Hardwaredemonstratorssetupforeachshowq L1trackfindingfeasiblewithneededperformance&withinlatencybudgetq Highefficiency,remarkablepT&Z0resolu8on,lowsensi8vitytopile-up
Furtherstudiesongoing(forallapproaches)basedonaFPGA-basedreferencedesignq Tofurtherassessul8mateperformancepoten8alandlimita8on
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AM+FPGAo PRwithcustomdesignedAMchipso Usecoarsestubinforma8onto
performfastPR&stubselec8ono CustomPulsar2bboardswithPR
mezzanineshos8ngAMchips&FPGA
HoughTransform(HT)o Trackcandidatesbuiltbasedon
(r,ø)HTo Stub-datapre-duplicatedatsingle
node,minimizingnumberofregionalboundaries
o µTCAbasedMP7boards
Trackleto Roadbasedtracksearchseededby
tracklets(stubpairs)o Mul8pleseedingensuringgood
coverageo µTCAbasedCTP7boards
Offline Tracking Performance
Trackertraversedby6000tracksonaverageeachBX(for200PU)
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HighPuritytracksconsidered.Within3.5cmradiallyfromthecenterofluminousregion.
ηSimulated track 4− 3− 2− 1− 0 1 2 3 4
Trac
king
effi
cien
cy
0
0.2
0.4
0.6
0.8
1
<PU> = 140<PU> = 200
CMS Phase-2 Simulation
eventstTracks from t < 3.5 cm0 > 0.9 GeV, d
Tp
14 TeV
ηSimulated track 4− 3− 2− 1− 0 1 2 3 4
) T /
pT
pδ(σ
2−10
1−10
1
Phase-1 detectorPhase-2 detector
CMS Phase-2 Simulation
Simulated muons = 10 GeV
Tp
Physics Performance Largeintegratedluminosity(3000Z-1)atHL-LHCenablesexplora8onofmul8-TeVscale
q Searcheswithhighmassesorinves8ga8onwithlowcrosssec8onprocesses.
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Excellenttrackingperformanceshownearlierq Majortoolstoachieveglobaleventdescrip8on
thatcanstandhighpileup.◦ Excellentperformanceofpileupmi8ga8onalgorithms.◦ Highb/c-taggingefficienciesathighpileup.◦ B-taggingcapabilityinhighetaregion.◦ Tauiden8fica8onconsistentasafunc8onofpileup.◦ Jetsubstructuretechniquesefficientupto2TeV.
(GeV)T
jet p30 100 200 1000
jet id
. effic
iency
0
0.2
0.4
0.6
0.8
114 TeV
CMS Phase-2 Simulation| < 1.5η|
no PUPU=140PU=200
b jet:
c jet:
(GeV)T
jet p30 100 200
jet id
. effic
iency
0
0.2
0.4
0.6
0.8
114 TeV
CMS Phase-2 Simulation| < 2.5η1.5 < |
no PUPU=140PU=200
b jet:
c jet:
(GeV)T
jet p30 40 100 200 300
jet id
. effic
iency
0
0.2
0.4
0.6
0.8
114 TeV
CMS Phase-2 Simulation| < 3.5η2.5 < |no PU
PU=140PU=200
b jet:
c jet:
|ηVBF jet generator |0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Jet P
V as
soci
atio
n ef
ficie
ncy
0
0.2
0.4
0.6
0.8
1
1.2
1.4Phase-1, (13 TeV), 25 PUPhase-2, 0 PUPhase-2, 140 PUPhase-2, 200 PU
| distribution (a.u.)ηVBF jet |
CMS Phase-2Simulation
ττ→VBF H =14 TeVs
Summary
CMSupgradesforHL-LHCisachallengingtask
HL-LHCrequirescompletereplacementofthecurrentTrackerq Radia8ondamage,enormouslyhighpileup,trackingatL1,increaseddetectoracceptance,reduc8oninmaterialbudget
R&DperformedforthePhaseIITrackerTechnicalDesignReport(TDR)presentedq Geometry,layout,moduledesign,sensors,performance,etc.q PhaseIITrackerUpgradeisalotmoregroundtocover(manyyearsofR&Dands8llongoing)q Completedescrip8onoftheCMSPhaseIITrackerintheTDR(*)q Majorworks8llaheadofus…
Reference:ThePhase-2UpgradeoftheCMSTracker,CERN-LHCC-2017-009(*)
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Current CMS Tracker ConfiguraSon
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Sensor:p-in-nDesignoccupancy:1-2%Outercell:~20cmx100-200μmInnercell:~10cmx80μmPixelcell:100μm2x150μm2
PresentStripTrackerdesignedtooperate8ll500Z-1
OriginalPixels(innertracker)alreadyreplacedby“PhaseI”PixeldetectorduringtheEYETS2016/17q Addi8onaltrackinglayer,op8mizedmaterialbudget,improvedROC,increasedbandwidth
Degrada8onofthecurrenttrackerbeyond1000Z-1
q Deteriora8onoftracking,physicsperformanceaffected(duetolimitedbandwidth&triggerlatency)
CompletereplacementofthecurrenttrackerrequiredforHL-LHC
4.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
1.82.02.22.42.62.83.0
z [mm]0 500 1000 1500 2000 25000
200
400
600
800
1000
1200
r [m
m]
TOB(OuterBarrel) TEC(EndCap)
ThickDetectors(500μm)
ThinDetectors(300μm) Blue:DoubleSidedRed:SingleSided
TIB
Pixels