The Lightweight Straw Tube Tracker for PANDA Detector at GSI
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Transcript of The Lightweight Straw Tube Tracker for PANDA Detector at GSI
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The Lightweight Straw The Lightweight Straw Tube Tracker for PANDA Tube Tracker for PANDA
Detector at GSIDetector at GSIAndrey SokolovAndrey Sokolov*,1*,1, James Ritman, James Ritman11, Peter Wintz, Peter Wintz11, ,
Paola GianottiPaola Gianotti22, Dario Orecchini, Dario Orecchini22 11Institut für Kernphysik, Forschungszentrum JülichInstitut für Kernphysik, Forschungszentrum Jülich22Laboratori Nazionali di Frascati, ItalyLaboratori Nazionali di Frascati, Italy
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PANDA detector
Target spectrometer:• MVD + STT/TPC + MDC• Time Of Flight• DIRC + RICH • Electro-Magnetic Calorimeter• Muon detection• Superconducting solenoid
Forward spectrometer:• Dipole magnet• MDC or STT• RICH• EMC• Hadron calorimeter• Muon detection
STT or TPC
Bernd Ketzer HK57.1Bernd Ketzer HK57.1
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Requirements to the Central Tracker
Almost full angular coverage;High momentum resolution, δp/p~1%;High spatial resolution, σrφ~150μm, σz~1-3mm;
Minimal detector material budget, X0~1%;High rate capability, 107ev/s;Resistance against aging effects, 1-2
C/cm/year;
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Central Tracker Options
Time-Projection ChamberTime-Projection Chamber (Christian H(Christian Höppner, öppner, HK 38.2)HK 38.2)
Straw Tube TrackerStraw Tube Tracker
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Straw Tube
r
Typical spatial resolutionTypical spatial resolution 50-300 50-300 μμmm
~2 kV
Ar+CO2
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Straw Tube
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Pressure Stabilized Straw Tube
Elongation 1.5mm
+50μm
Pabs=2 atm
Overpressure gives the stability and rigidity to the straw Overpressure gives the stability and rigidity to the straw tube, but it also change straw tube dimensions.tube, but it also change straw tube dimensions.
That should be taken into account in the tracker design.That should be taken into account in the tracker design.
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COSY –TOFCOSY –TOF Straw Tube Tracker Straw Tube TrackerOne double layerOne double layer
Pressure Stabilized Straw Tube Tracker
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Spatial Resolution
Spatial resolution of the COSY-TOF straw tube trackerSpatial resolution of the COSY-TOF straw tube tracker
Ar+20%CO2
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Proposed PANDA pressure stabilized straw tube trackerProposed PANDA pressure stabilized straw tube tracker
Pressure Stabilized Straw Tube Tracker
1.5m
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Aging Phenomena in Straw Tube
Gas gain in the straw tube can deteriorate and dark current (noise) can increase with a time due to aging effects, namely:– deposit of the conductive polymers on the wire surface;– formation of an insulation coating on the cathode (Malter
effect);– anode wire swelling by the free radicals;– oxidation of the conductive layer on the cathode surface.
These aging phenomena are typically observed for the accumulated charge values > 1-3 C/cm, depending on the gas mixture.
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Aging Phenomena in Straw Tube
Anode wire surface after irradiation Anode wire surface after irradiation [ATLAS TRT, NIM A512(166)][ATLAS TRT, NIM A512(166)]
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Longitudinal Hits Projection
1000 events of pp collisions (DPM generator)1000 events of pp collisions (DPM generator)
protonsprotons
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Hit/Charge Density Along Straw Length
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Conclusions and Outlook
New design for the PANDA Straw Tube Tracker has been proposed;
The total weight of the tracker will be only about 50 kg;
The spatial resolution is about 150μm using Ar+10%CO2 gas mixture;
The background simulation shows the very high radiation load;
The beam test is under preparation; The test and simulation results of the PANDA
straw tube tracker demonstrate the feasibility of the chosen detector concepts.
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Total number of tubes - ~5000; Radial dimensions – 16-42cm; Length – 1.5m; Tube diameters – 10mm; Tube wall material – Mylar, 30μm; Anode wire – W/Re, 20μm; Spatial resolution – σrφ≈150μm, σz≈3-10mm;
Gas filling – Ar+10%CO2; Gas absolute pressure – 2 bar; Thickness - ~1% X0.
STT parameters
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Longitudinal Coordinate Measurement
Skewed layers – 1-4 mm precision;
Charge sharing:– 10-20 mm precision;
Time of charge propagation:– 10-20 mm precision.
One planar double-layer with the skewed straw tubesOne planar double-layer with the skewed straw tubes
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HESR: High Energy Storage Ring
Beam Momentum1.5 - 15 GeV/c
High Intensity Mode:Luminosity 2x1032 cm-2s-1 (2x107Hz)p/p (st. cooling) ~10-4
High Resolution Mode:Luminosity 2x1031 cm-2s-1 p/p (e- cooling) ~10-5
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Straw TubeStraw Tube Tracker