Mitglied der Helmholtz-Gemeinschaft Andrey Sokolov IKP FZ Jülich, Germany The Central Tracker of...

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Andrey Sokolov IKP FZ Jülich, Germany

The Central Tracker of the PANDA Detector

The X International Conference on Instrumentation for Colliding Beam

Physics

Novosibirsk, Russia28.02-5.03.2008

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Outline• Overview of FAIR project• Layout of PANDA detector• PANDA Central Tracker:

Micro-Vertex Detector Straw Tube Tracker

• Conclusions and Outlook.

29.2.2008 2Andrey Sokolov

29.2.2008 Andrey Sokolov 3

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Facility for Antiproton and Ion Research


GSI, Darmstadt

- heavy ion physics;- nuclear structure;- atomic and plasma physics;- cancer therapy.

FAIR: New facility

- heavy ion physics;- higher intensities & energies;- antiproton physics.

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FAIR


Key Technical FeaturesKey Technical Features• Cooled beams;• Rapidly cycling superconducting magnets;• Parallel Operation.

Storage and Cooler RingsStorage and Cooler Rings• Radioactive beams;• e-– A (or p-A) collider;• 1011 stored and cooled antiprotons 0.8 - 14.5 GeV/c;• Future: Polarized antiprotons (?).

Primary BeamsPrimary Beams• 238U28+ : 1012/s @ 1.5-2 Age;• 238U92+: 1010/s @ up to 35 AGeV• Protons : 2 x1013/s @ 30 GeV; up to 90 GeV;• 100-1000 times present intensity.

Secondary BeamsSecondary Beams• Broad range of radioactive beams; up to 1.5 - 2 AGeV;• intensity up to 10 000x over present;• Antiprotons 0 - 15 GeV.

SIS 100/300

HESR Super FRS

RESR

CR

NESR

FLAIR

UNILAC

SIS 18

FRSESR

ExistingNew

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High Energy Storage Ring


PANDA

Parameters of HESR

•Injection of p at 3.7 GeV;•Beam momentum - 1.5-14.5 GeV/c;•Storage ring for internal target

operation;•Luminosity up to L~ 2x1032 cm-2s-1;•Beam cooling (stochastic & electron);•Energy resolution down to 4·10-5.

ECM

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The Physics Overview

• Charmonium and open charm spectroscopy;Charmonium and open charm spectroscopy;• Charmed hybrids and glueballs:Charmed hybrids and glueballs:

- Many narrow states are predicted;• Interaction of charmed particles with nuclei:Interaction of charmed particles with nuclei:

- Meson mass modification in the nuclear matter;• Hypernuclei:Hypernuclei:

- Double hypernuclei production via Ξ-baryon capture;

• Many further options:Many further options:- Wide angle compton scattering;- Baryon-Antibaryon production;- CP-Violation (Λ,D).


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Antiproton ANnihilations at DArmstadt: PANDA


Detector requirements:Detector requirements:• nearly 4π solid angle for PWA;• high rate capability: 2x107 interactions/s;• efficient event selection;• good momentum resolution ≈ 1%;• vertex info for D, K0, Σ, Λ;• good PID (γ, e, μ, π, Κ, p);• photon detection 1 MeV – 10 GeV.

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PANDA Detector


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PANDA Detector


Target Spectrometer:Target Spectrometer:Superconducting solenoid for high pt tracks.

Pellet or Cluster Jet TargetPellet or Cluster Jet Target

Forward SpectrometerForward SpectrometerDipole magnet for forward tracks

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PANDA Detector: PID


Barrel DIRCBarrel DIRC(G.Shepers)(G.Shepers) Endcap DIRCEndcap DIRCBarrel TOFBarrel TOF Forward TOFForward TOF

Forward RICHForward RICH

Muon DetectorsMuon Detectors

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PANDA Detector: Calorimeters


PWO Calorimeters,PWO Calorimeters,(P.Semenov)(P.Semenov) Forward Shashlyk EMCForward Shashlyk EMC Hadron CalorimeterHadron Calorimeter

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PANDA Detector: Tracking


Micro vertex Micro vertex DetectorDetector

TrackerTracker GEM DetectorsGEM Detectors

Drift ChambersDrift ChambersPANDA Central Tracker

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Micro-Vertex Detector: Challenges•Provide an information about secondary vertices from

charm and strange particles decays: c123μm for D0, c8.71cm for 0 high precision and

large sensitive volume; •Broad momentum range of the outgoing particles:

low material budget to minimize multiple scattering;

•Asymmetric particle flux due to the fixed target nature of experiment: specific detector layout;

•Continuous beam operation: triggerless operational mode;

•High event rate (up to 107evt/s);•Particle identification.29.2.2008 Andrey Sokolov 14

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Micro-Vertex Detector


Beam

Beam pipe

Target pipe

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4 Barrel Layers4 Barrel Layers

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6 Forward Disks6 Forward Disks

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Micro-Vertex Detector: Pixel Part


Hybrid pixels 100x100 µm2; 120 modules; Maximum rate up to 10

Mhits/s/module; ~10 M channels; ToT; 0.15 m2; ~1% X0 per layer.

FE-Chip

MCC

Pigtail Sensor + Flex

Wire-Bonds

Stecker

Kapazitäten + Widerstände


Micro-Vertex Detector: Pixel Part

Front-End chip:Front-End chip:• ATLAS front end chip as a starting point;• Custom pixel front-end chip – TOPIX (TOrino PIXel) in

0.13µm CMOS: TOPIX1 – only analogue part (2005); TOPIX2 – preamp + buffers (2007).

• Maximum hit rate up to 2 MHits/s data rate 200Mbit/s;• Thickness ~ 200µm.

Sensor:Sensor:• Epitaxial silicon sensors:Epitaxial silicon sensors:

5050µm , 75µm, 100µm under testingin Torino.

INFN Torino

INFN Torino

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MVD: Strip Part


•~400 modules;~400 modules;•~0.5m~0.5m22 active area; active area;•~70.000 readout channels.~70.000 readout channels.

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MVD: Strip Part


Microstrip readout:Microstrip readout:

• 128-channel ASIC for strips;• Prototype n-XYTER chip for DETNI (GSI);

Fast timing shaper/amplifier with comparator (1ns time resolution);

Slow channel for analog r/o with peak detector; Token ring readout of hit channels.

• Next iteration with lower power consumption;• Self-triggering operation mode.

Sensor:• Silicon double side strip sensor with pitch 100µm.

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MVD: Spatial resolution


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MVD: Particle Identification



MVD Support Structure

It’s planned to build the support structure out of the It’s planned to build the support structure out of the 2mm Carbon foam2mm Carbon foam..


STT Assembling and Installation


Tracker: TPC Option• Multi-GEM stack for

amplification and ion backflow suppression;

• Gas: Ne/CO2 (+CH4/CF4);

• 100k pads of 2 x 2 mm2;

• 50-70µs drift, 700 events overlap.

Simulations:Simulations:p/p ~ 1%;• dE/dx resolution ~ 6%. Challenges:Challenges:• space charge build-up;• continuous sampling;• Field homogeneity better 2%;• ∫Br /Bz dz < 2mm.


Straw Tubes Tracker

•~4100 straws;•30µm Al-mylar tube, Ø=10mm, l=1.5m;

•Rin= 16cm, Rout= 42cm;

•Gas filling Ar/10%CO2;

•Light detector with X/X0 ~ 1.0-1.3%.

Axial layers:Axial layers:• r < 150µm, A ~ 99%;

Skewed layers:Skewed layers: • z ~ 3mm, A ~ 90-95%;

Momentum resolution:Momentum resolution: ptpt / p / ptt ~ 1.2 % ~ 1.2 %


STT Layout

Self-supporting straw layers at ~1 bar overpressure.

1.5m1.5m

10mm10mm

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PANDA Detector


Straw Tube Tracker


COSY-TOF Straw Tube Tracker

•3120 straw tubes in 15 planar double layers ;

• Aligned at = 0°, 60°, 300° for 3d-reconstruction;

• Gas: Ar/CO2(10%), p=1.2bar; • Active volume: 1m2 x 30cm;• Resolution: r 100 µm;• Efficiency: 99%;• Radiation length: X/X0 1.3%;• Lowest detector weight ~ 15kg

total stretching force ~ 3200 kg!

• Operates in vacuum.

1m1m


COSY-TOF STT: Cosmic Ray Test

Spatial resolution Spatial resolution ~ 100µm ~ 100µm

limited ionisation clustersnear tube wall

Radial efficiency Radial efficiency ~ 98% ~ 98%


STT Particle Flux Density

Recoil protons from the target produce a charge load up to Recoil protons from the target produce a charge load up to 0.4C/cm/year.0.4C/cm/year.


STT Aging Beam Test•32 straws in doble layer;32 straws in doble layer;•3 gas mixtures:3 gas mixtures:

Ar+10%CO2; Ar+30%CO2;Ar+30%C2H6.

•Proton beam:Proton beam:3GeV/c; up to 8106 protons/s;beam spot ~4cm.

•Gas gain .5-1Gas gain .5-1101055..•Accumulated charge up to Accumulated charge up to

1.2Q/cm (~3 years of 1.2Q/cm (~3 years of PPANDAANDA operation).operation).


STT Aging Test

Maximum gain drop Maximum gain drop less than 10%!less than 10%!


Conclusions•FAIR project has been officially started.• PANDA will be a versatile detector for charm physics.•The design and prototyping of MVD is on the good way:

Two prototypes of the front end pixel chip are released.

The prototope for the strip front end chip is under construction.

•The MVD design comprises the good spatial resolution with PID capabilities.

•The straw tubes is suggested as option for PANDA tracker.•Due to the new technique STT will have very low material

budget combining with the good spatial resolution and efficiency.

•The beam test shows sufficient radiation hardness of STT.


Outlook• TOPIX3 prototype should be ready by the end of this

year;• Half-cylinder full length STT prototype should be finished

in the next year;• The PANDA TDR will be ready in the beginning 2010;• PANDA commissioning in 2015.


The PANDA Collaboration

U BaselIHEP BeijingU BochumU BonnU & INFN BresciaU & INFN CataniaCracow JU,TU, IFJ PAN GSI Darmstadt TU DresdenJINR Dubna (LIT,LPP,VBLHE)U EdinburghU ErlangenNWU EvanstonU & INFN FerraraU FrankfurtLNF-INFN Frascati

U & INFN GenovaU GlasgowU GießenKVI GroningenU Helsinki IKP Jülich I + IIU KatowiceIMP LanzhouU MainzU & Politecnico & INFN MilanoU MinskMoscow, ITEP & MPEITU MünchenU MünsterBINP NovosibirskLAL Orsay

U PaviaIHEP ProtvinoPNPI GatchinaU of SilesiaU StockholmKTH StockholmU & INFN TorinoPolitechnico di TorinoU Oriente, TorinoU & INFN TriesteU TübingenU & TSL UppsalaU ValenciaSMI ViennaSINS WarsawU Warsaw

More than 420 physicists from 55 institutions in 17 countries

Mitglied der Helmholtz-Gemeinschaft Andrey Sokolov IKP FZ Jülich, Germany The Central Tracker of...

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