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Prometeusz Jasinski
A Luminosity Detector for the PANDA Experiment at FAIR Prometeusz Jasinski on behalf of the PANDA collaboration 25.02.2014 INSTR14 BINP, Novosibirsk 25.02.2014 Prometeusz Jasinski 1 PANDA – Experiment at FAIR Straw tubes 25.02.2014 Prometeusz Jasinski 2 PANDA – Experiment at FAIR Straw tubes High HighEnergy EnergyStorage StorageRing Ring(HESR) (HESR) Beam properties Beam properties (high luminosity mode) (high luminosity mode) Particles Particles Momentum p Momentum p Dp/p Dp/p Luminosity L Luminosity L 25.02.2014 Prometeusz Jasinski Anti-Protons Anti-Protons 1.5–15 GeV/c 1.5–15 GeV/c < 1 x 10-4-4 < 1 x 10 2 x 103232cm-2s-2-1-1 2 x 10 cm s 3 PANDA – Experiment at FAIR Straw tubes Physics PhysicsTopics Topics Hadron HadronSpectroscopy Spectroscopy Nucleon NucleonStructure Structure Hadrons HadronsininMatter Matter Hypernuclei Hypernuclei 25.02.2014 Prometeusz Jasinski 4 Determination of Luminosity event rate ΔN = L⋅σ Δt Luminosity L= 25.02.2014 ΔN 1 ⋅σ Δt with Prometeusz Jasinski cross section ΔL <4 % L 5 Elastic Proton Anti-Proton scattering pp pp c.m.s. p q t p q 25.02.2014 Prometeusz Jasinski 6 Elastic scattering as reference Measure Measureatat small smallmomentum momentumtransfers transfers|t||t| small smallscattering scatteringangles anglesQQ → → reduction reductionofofuncertainties uncertaintiesby bymodel model hadronic electromagnetic (Coulomb) 25.02.2014 Prometeusz Jasinski 7 Particle track reconstruction top view 25.02.2014 Prometeusz Jasinski 8 Measurement close to the Beam Requirements Requirementsfor forthe thedetector: detector: minimal track distortion by material minimal track distortion by material maximum acceptance elastic events maximum acceptance elastic events measurement at smallest angles measurement at smallest angles 25.02.2014 Prometeusz Jasinski 9 Measurement close to the Beam Requirements Requirementsfor forthe thedetector: detector: Requirements Requirementsby bythe thestorage storagering: ring: minimal track distortion by material minimal track distortion by material high vacuum < 10-9-9mbar high vacuum < 10 mbar maximum acceptance elastic events maximum acceptance elastic events maximum acceptance of the beam maximum acceptance of the beam measurement at smallest angles measurement at smallest angles slow changes of beam pipe diameter slow changes of beam pipe diameter 25.02.2014 Prometeusz Jasinski 10 Vacuum Box Prototype 25.02.2014 Prometeusz Jasinski 14 Beam Pipe Prototype 25.02.2014 Prometeusz Jasinski 15 Differential Pumping Scheme transition region beam beam pipe vacuum box turbo molecular pump turbo molecular pump Scroll fore pump 25.02.2014 Prometeusz Jasinski 16 First Pumping Tests 25.02.2014 Prometeusz Jasinski 17 First Pumping Tests After 2.5 weeks of pumping 6.37·10-8 mbar 4.50·10-7 mbar Next: Testing with an additional getter pump 25.02.2014 Prometeusz Jasinski 18 Retractable Detector Halves 25.02.2014 Prometeusz Jasinski 19 Retractable Detector Halves 25.02.2014 Prometeusz Jasinski 20 Retractable Detector Halves 25.02.2014 Prometeusz Jasinski 21 Vacuum Box Deformations 10 µm 420 µm 265 µm Finite Element Model (FEM) at a pressure difference of 1 bar (Inventor 2014) 25.02.2014 Prometeusz Jasinski 22 Displacement Measurement in Vacuum Capacitive probes: Capacitec 208-ACU 2 mm range ~ 40 nm resolution Aquisition via 18-bit differential ADC and microcontroller with CAN interface DCS via Epics: Florian Feldbauer Sat 9:00 am 25.02.2014 Prometeusz Jasinski 23 Vacuum Box Deformations 10 µm 70 µm 420 µm 1530 µm simulation vs measurement 265 µm 900 µm 25.02.2014 Prometeusz Jasinski 24 The Tracking System 25.02.2014 Prometeusz Jasinski 25 Simulations on cooling Simulations with up to 7 mW/mm² 43°C -20°C clamp AutoDesk CFD 2014 25.02.2014 Prometeusz Jasinski 27 Simulations vs. Reality Testing contact materials for the module clamp and a copper dummy 25.02.2014 Prometeusz Jasinski 29 Simulations vs. Reality „worst case“ 25.02.2014 Prometeusz Jasinski 30 A Support Structure as a Heat Sink Aluminum Cooling of up to 250 W per plane half Coolant: -20°C cold Ethanol frontend electronics attached to the surface V2A pipe 25.02.2014 Prometeusz Jasinski 31 Production of Heat Sink Supports Original idea: LHCb Velo Detector melting AlMg4.5Mn alloy for 730°C 90 min in argon atmosphere 25.02.2014 Prometeusz Jasinski 32 Production of Heat Sink Supports Right now: Tests of the cooling performance in vacuum 25.02.2014 Prometeusz Jasinski 33 Track Reconstruction 4 planes with distances of 20-10-10 cm in between (Geant 4 simulation model) 25.02.2014 Prometeusz Jasinski 34 Material Budget of one Plane one side of a module flex cable Al Al resin < 15 µm polymide 10 µm resin < 15 µm Al layer 14 µm Poly-p-xylylen 5 µm resin < 15 µm HV-MAPS 50 µm resin < 15 µm CVD-diamond 200 µm 25.02.2014 Prometeusz Jasinski X/X0 (2 sides) = 0.37% ( eq. 350 µm thick silicon ) 35 Resolution at the Detector Luminosity detector interaction point hits 25.02.2014 Prometeusz Jasinski 36 Resolution after back propagation Luminosity detector interaction point hits 25.02.2014 Prometeusz Jasinski 37 Fit of the Luminosity at 1.5 GeV/c 25.02.2014 Prometeusz Jasinski 38 What's next? Upcoming tests: - A full cooling circuit at full load - More on the mechanical precision - Glued flex print vacuum feed throughs - Gluing of thin sensors - Systematic fit studies Our goal: finalizing our TDR this year! 25.02.2014 Prometeusz Jasinski 39 Simulations with PANDAROOT (Geant) 25.02.2014 Prometeusz Jasinski 40 Differential Pumping Sheme 25.02.2014 Prometeusz Jasinski 41 Cooling stations for cooling liquids versus Cooling power @-20°C 1.9 kW 2.2kW max. pumping speed 105 l/min 45 l/min max. pumping pressure 2.5 bar(special version) 2.9 bar Huber Unistate 425 w 25.02.2014 Lauda XT 550 (W) Prometeusz Jasinski 42 Dimensions of the current design T-cross BPM Width: 370 mm Missing for the full length: Valves and bellows 25.02.2014 Prometeusz Jasinski 43 Geometrical Acceptance Acceptance at 1.5 GeV/c beam momentum 25.02.2014 Prometeusz Jasinski 44 Connection of cooling pipes and the module supports 25.02.2014 Prometeusz Jasinski 45 25.02.2014 Prometeusz Jasinski 46 First Pumping Tests 8.66·10-6 2.63·10-2 vacuum box turbo pump off 25.02.2014 Prometeusz Jasinski 47
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