Status dell esperimento PANDA

Transcription

1 Status dell esperimento PANDA Daniela Calvo on behalf of the PANDA collaboration Sezione di Torino SIF2011, Societa Italiana di Fisica - XCVII Congresso Nazionale Settembre 2011, L Aquila, Italy

2 Daniela Calvo FAIR

3 The FAIR project On October, 4th 2010, the international owners founded the FAIR GmbH. The FAIR GmbH will coordinate the construction of the accelerator and experiment facilities. The participating countries will contribute their technical and scientific expertise to the project, in addition to their financial and in kind input.

4 Facility for Antiproton and Ion Research Proton linac SIS 18 SIS 100 Antiproton production Proton Linac 50 MeV Accelerate p in SIS18 / 100 Produce p on target Collect in CR, cool in RESR UNILAC ESR FRS HESR New Existing RESR CR High Energy Storage Ring stored antiprotons, momentum range 1.5 to 15 GeV/c Luminosity at peak intensity: L = cm -2 s -1 δp/p = 10-4 (stochastic cooling) Luminosity for highest resolution: L = cm -2 s -1 p/p < (electron cooling) from RESR

5 Extensively antiproton physics program Non perturbative QCD dynamics Hadrons in the Nuclear Medium Nucleon structure Electroweak Physics Charmonium spectroscopy Exotic states Hypernuclear physics Open charm physics D physics Physics Performance Report for Strong Interaction Studies with Antiproton Mar arxiv.org/abs/ v1

6 PANDA modular multi-purpose device Excellent forward acceptance and resolution (Moderate) backward acceptance Wide dynamic range: particle momenta GeV/c Momentum measurements in magnetic fields (Dp/p 1%) Particle ID in wide momentum range e, m, p, K, p, Electromagnetic calorimeter: g, p 0, h... (e ) High-resolution vertex detection: D, D 0 / K s, Λ, Σ, Ω... High average interaction rate ann/s -1 Intelligent trigger design for parallel data acquisition at high rates and small branching fractions Modular setup for double hypernuclei study

7 FAIR Timelines Building permits Site preparation Civil construction contracts Building of accelerator & detector components Completion of civil construction work Installation of accelerators and detectors Data taking HZDR Workshop, Rossendorf, 6/9/11, by G. Rosner FAIR BFCl, Darmstadt, 5/9/11, by G. Roesner Experiments Submit Pre-construction MoUs 1/7/2011 Finish R&D phase 2011/12 Deliver prototypes of all essential parts of detectors Submit complete sets of TDRs 2011/12 Take decisions on alternative technical solutions Co-ordinate with 2011/12 Civil construction requirements Accelerator setup schedule Identify critical pathways 2011/12 Milestones, timelines, deliverables Submit risk management plan 2011/12 Secure funding 2011/12 Submit Construction MoUs end of 2012 (Europe-wide) tendering 2013 Build detector Submit Operations MoUs 2016 Commission experiments 2017/18 Initial period of data taking

8 Overview Daniela Calvo The PANDA apparatus Magnets and EM calorimeter progress Ongoing Technical Design Reports: Target system MicroVertexDetector Straw Tubes - central tracker Muon detector News on some other detectors: Forward tracker Hypernuclear setup Conclusions

9 PANDA apparatus DIRC Cherenkov target TOF µ counters EM calorimeter RICH Shashlik calorimeter µ counters p Straw chambers 12 m MVD STT GEM PANDA is a fixed target experiment with frozen hydrogen and heavier nuclear targets (N, Au..) Pellet target / Cluster-jet target/ Wires

10 Target spectrometer

11 Forward spectrometer

12 Magnets The 2T solenoid ~ 3 m long and ~1 m radius coil interruption to allow target operation Nb/Ti 5000 A nominal current field quality on the tracker: ± 2% in 150 < r <420 mm and -400 < z < 1100 mm <2 mm Br/Bz integral in the same volume the solenoid can be operated at every current lower than the nominal one the iron return joke will be laminated to host 13 layers of muon chambers The 2 Tm DIPOLE acceptance: ±5 (V) and ±10 (H) air gap: 2.5m (z), 3.1m (x), 1 m (y) good uniformity in the air gap, at max. field the deflection of antiproton crossing at the center is 2.2 (@ 15 GeV) Technical documentation to call for the tenders for the construction is in progress

13 15552 PWO-II crystals (light yield: 2xCMS) inner radius of barrel 57 cm thickness 22Xo cooled down to -25 C (light yield: 4xT=25 C) energy resolution: 1.54%/ E[GeV]+0.3% Photosensors: Large Area Avalanche Photodiodes (LAAPDs) (barrel), two each cristal Vacuum Photo-Triodes (VPTs) (endcap) EM calorimeter 2cm x 2cm x 20cm Module threshold is 0.75 MeV All the crystals for the forward end-cap have been bougth: 23 % of the whole EMC

14 Daniela Calvo Ongoing TDRs

15 30 cm Micro Vertex Detector Readout channels: ~ 11 million (pixel: 100mm x 100mm)) ~ (strip) Carbon fiber cylindrical frame Target pipe 40 cm 4 barrels Two inner layers: hybrid pixel detectors Two outer layers: double sided silicon strip detectors Beam pipe Conical structure to support pixel barrels Frame to support disks and 6 forward disks Four disks: hybrid pixel detectors Then two disks: Mixed pixel and strips PID

16 MVD: material budget and rate Pixel readout: (ToPix) 130 nm CMOS technology Max bit rate: ~450 Mb/s per pixel readout chip (12760 readout cells 100mm x 100mm pixel size)

17 MVD: spatial resolution Primary vertex resolution 15 GeV/c xy z z 65 mm Vertex resolution (6.57 / 7.50 / 8.50) GeV/c Primary and secondary vertex resolution: x,y 35 mm z 100 mm

18 STT central tracker 4636 Straw tubes in 2 semi barrels around beam/target cross-pipe planar layers in 6 exagonal sectors axial layers in beam direction 4 stereo double-layers for 3D reconstr., with skew angle Time readout (isochrone radius) Amplitude readout (energy loss) Rin/Rout: 150/418 mm Al-mylar film, s= 27 mm, d=10 mm, L=1500mm 20 mm sense wire (W/Re, gold plated) 2.5 weight/tube X/Xo= 4.4x 10-4 /tube Straw tubed are assembled under overpressure (Dp=1bar) Strong rigidity: multi layer straw module is self supporting Perfect and strong cylindrical tube shape by inner gas overpressure rf ~ 150 (100) mm, z ~ 3 (2) mm (single hit) E/E <8% for p/k identification p/p ~ 1-2 % at B=2T

19 STT: momentum resolution Simulation parameters: 5000 single muon events each point. Fixed total momentum 0.3, 1, 1.5, 2 GeV/c θ: [5-25 ] in steps 2 ; [ ] in steps 5 ϕ Uniform: [0-360 ]! "#$%&(*/) 34(-*. 9"&- STT alone Pattern! J J (M%+#& recognition STT+MVD+GEM Pattern Recognition

20 STT : energy loss resolution Test beams at 3 different proton momenta 2.9 GeV/c, 1.0 GeV/c, 640 MeV/c de/dx resolution (30% truncation) de/e = 9.3 % at 2.9 GeV/c de/e = 8.1 % at 1.0 GeV/c de/e = 7.0 % at 640 MeV/c (Rev. of Part.Phys, 2010)

21 STT : spatial resolution and reconstruction efficiency Ar/CO 2 (20%) 1.25bar Efficiency of the STT alone Pattern Recognition 95% -> 100% ( Gev/c protons, 1-10 tracks for event) STT capabilities

22 Muon detector 1 cm wide, 10 cm long strips 4 MDT layers near vertical tracks -> 37 layers Mini Drift Tubes Proportional mode operation Induced signal on external strips ~ 4k MDT, 30 kwire, 75 kstrips σ~0.4 mm

23 Daniela Calvo Some other detectors

24 6 Tracking stations: 2 before, 2 inside and 2 after dipole magnet based on 1 cm 2bar pressure straw tubes Each tracking station contains four doublelayers: two with vertical straws two tilted by ±5 Angular acceptance: ±5º vertically, ±10º horizontally Momentum acceptance down to ~2% of p beam Momentum resolution: ~0.5% Forward tracker

25 Double hypernuclei- modular setup Dimensions primary target Si ring outer f =15 mm Si ring inner f = 11 mm Diamond thickness = 3 mm Diamond wire width = 100 mm Si ring Diamond by cortesy of D. Rodriguez primary 12 C target Diamond wire Secondary target Si m-strip + Be,B,C absorbers

26 Conclusion PANDA apparatus is a general purpose detector High rates, high precision, various targets The production phase is already started for the EMC The R&D phase is ongoing to finish Most of TDR will be released by the end of 2011, the rest within 2012 Daniela Calvo

27 Institutes More than 400 physicists from 53 institutions in 16 countries U Basel IHEP Beijing U Bochum IIT Bombay U Bonn IFIN-HH Bucharest U & INFN Brescia U & INFN Catania JU Cracow TU Cracow IFJ PAN Cracow GSI Darmstadt TU Dresden JINR Dubna (LIT,LPP,VBLHE) U Edinburgh U Erlangen NWU Evanston U & INFN Ferrara U Frankfurt LNF-INFN Frascati U & INFN Genova U Glasgow U Gießen KVI Groningen IKP Jülich I + II U Katowice IMP Lanzhou U Lund U Mainz U Minsk ITEP Moscow MPEI Moscow TU München U Münster BINP Novosibirsk IPN Orsay U & INFN Pavia IHEP Protvino PNPI Gatchina U of Silesia U Stockholm KTH Stockholm U & INFN Torino Politechnico di Torino U & INFN Trieste U Tübingen TSL Uppsala U Uppsala U Valencia SMI Vienna SINS Warsaw TU Warsaw + as new entry at the last Panda meeting of September: Bhaba Atomic Research Center (BARC)(India), Suranee University of Technology (SUT) (Thailand), LNL (Italy),

28 Shashlyk calorimeter 7 m from the interaction point active area: 2970mm x 1540mm Supermodule number: modules in a supermodule Energy resolution: E/E= 3.5/E + 2.4/ E +1.3[%], E in GeV MODULE 380 layers of 0.3mm lead and 1.5 mm scintillator 55mm x 55mm transverse size total lenght: 680mm total radiation length: 20 Xo Moliere radius: 59mm light collection: 36 WLS fibers (1 mm diameter) photodetector: PMT

29 Conclusion Integrated 2x cm -2 s -1 (50% efficiency) ~ 8 pb -1 / day ~ 3 fb -1 / year Reconstructed events per year 2 x 10 7 C 2 2 x 10 7 DDbar 2 x 10 8 XXbar 2 x 10 9 J/Y Fine scan to measure masses with DM~50 KeV and G~ 10% Daniela Calvo

30 Charmonium States ε 40% > events per PANDA year

31 Hypernuclei production probability - 13 LLB X C 13 LLB * : Double-Hypernuclei : Single-Hypernuclei : Twin-Hypernuclei : LL production of excited states of Double Hypernuclei is significant PLB 697 (2011)