Peter Senger (GSI) The Compressed Baryonic Matter (CBM) experiment at FAIR FAIR Meeting Kiev, March Outline:  Scientific mission  Experimental and technical challenges  Collaboration with Ukraine

Crab nebula: ashes of a core collapse supernova observed in 1054 by Chinese Discovery of the first pulsar in 1968

Super-dense matter in nature: neutron star F. Weber J.Phys. G27 (2001) 465

Extreme states of strongly interacting matter baryons hadrons partons Compression + heating = quark-gluon matter (pion production) Neutron stars Early universe

time temperature 15 billion years 1 billion years years 3 minutes 1 millisecond 3 K 20 K 10 9 K K Distanz 3000 K The evolution of matter in the universe The soup of the first millisecond: quarks, antiquarks, electrons, positrons, gluons, photons

The phase diagram of strongly interacting matter World-wide experimental (and theoretical) efforts:  RHIC-BNL (USA) and LHC-CERN: high temperatures  CBM-FAIR: high baryon densities

Messengers from the dense phase ? U+U 23 AGeV

Experimental challenges  up to 10 7 Au+Au reactions/sec  determination of (displaced) vertices with high resolution (  50  m)  identification of leptons and hadrons Central Au+Au collision at 25 AGeV: URQMD + GEANT4 160 p 400   + 44 K + 13 K -

Identification of strange particles in heavy-ion collisions with Silicon Tracking System   -  - total efficiency 10.6% 2.1% 1.0% (uds)(dss) (sss) central Au+Au collisions at 25 AGeV:  Silicon tracker: 2 hybrid pixel (750 µm each), 4 microstrips (400 µm each)  Strips with 50 µm pitch and 5 o stereo angle  full event reconstruction

τ = 317 μm/c Track reconstruction: realistic magnetic field, 2 MAPS, 6 micro-strip detectors proton identification via TOF Identification of charmed particles in heavy-ion collisions with Silicon Tracking System D production cross sections from HSD Hadronic background from UrQMD τ = 123 μm/c D0D0 K-K- π+π+ D0D0

Dipol magnet The Compressed Baryonic Matter Experiment Ring Imaging Cherenkov Detector Transition Radiation Detectors Resistive Plate Chambers (TOF) ECAL Silicon Tracking System Tracking Detector Muon detection System Silicon Tracking System:  1 Mio Strips, radiation hard sensors  ultra-light mechanical structure  ultra-thin micro-cables, 55 cm long, 100 μm pitch

Cost estimate CBM experiment (as of 2005) Components cost (k€) Silicon Pixel Detector (MAPS)1800 Silicon Microstrip Detector9220 Ring Imaging Cherenkov Detector (RICH) Transition Radiation Detector (TRD) TOF Stop Detector (TOF-RPC)7150 – 7770 Electromagn. Calorimeter (ECAL)9498 Superconducting magnet2832 Data acquisition and trigger (DAQ)5500 Computing (Commissioning)1000 Infrastructure4950 Sum55950 – Added in 2006: Muon detection system 11 Mio euro

Silicon detector development Detector test board under production at GSI. New "Technology wafer" under production at CIS: Focus on radiation hardness. First mechanical module pre-prototypes, INR Kiev. Charge, Strip ” k” Charge, Strip “k+1” Detector tests at INR Kiev Analog readout cable, first pre-prototype. SE SRTIIE Kharkov. 55 cm long, 1024 lines, 100 µm pitch 14 µm Al on 10 µm Kapton

Scientists at GSI from Ukraine (Nat. T. Shevchenko Univ. Kiev):  Iouri Vassiliev (Postdoc)  Tetyana Galatyuk (PhD student)  Dmitry Kresan (PhD student)  Anton Lymanets (PhD student)  + sommerstudents Collaborators in Ukraine:  Prof. Dr. Vyacheslav Borshchov State Enterprise Scientific Research Technological Institute of Instrument Engineering, Kharkov, Ukraine  Prof. Dr. Igor M. Kadenko National Taras Shevchenko University of Kiev  Prof. Dr. Valery M. Pugatch Institute for Nuclear Research, Kiev National Academy of Sciences of the Ukraine  Prof. Dr. Gennady Zinovjev Bogolyubov Institute for Theoretical Physics National Academy of Sciences of the Ukraine Ukraine in CBM

CBM Collaboration : 51 institutions, ~ 400 members Croatia: RBI, Zagreb Split Univ. China: CCNU Wuhan USTC Hefei Cyprus: Nikosia Univ. Czech Republic: CAS, Rez Techn.Univ.Prague France: IPHC Strasbourg Hungaria: KFKI Budapest Budapest Univ. Russia: IHEP Protvino INR Troitzk ITEP Moscow KRI, St. Petersburg Kurchatov Inst., Moscow LHE, JINR Dubna LPP, JINR Dubna LIT, JINR Dubna MEPHI Moscow Obninsk State Univ. PNPI Gatchina SINP MSU, Moscow St. Petersburg P. Univ. Ukraine: T. Shevchenko Univ., Kiev India: Aligarh Muslim Univ. Panjab Univ. Rajasthan Univ. Univ. of Jammu Univ. of Kashmir Univ. of Calcutta B.H. Univ. Varanasi VECC Kolkata SAHA Kolkata IOP Bhubaneswar IlT Kharagpur Korea: Korea Univ. Seoul Pusan National Univ. Norway: Univ. Bergen Supported by EU FP6 Germany: Univ. Heidelberg, P.I. Univ. Heidelberg, KIP Univ. Frankfurt Univ. Mannheim Univ. Münster FZ Dresden GSI Darmstadt Poland: Jag. Univ. Krakow Warsaw Univ. Silesia Univ. Katowice AGH Krakow Portugal: LIP Coimbra Romania: NIPNE Bucharest CBM Collaboration Meeting in Strasbourg Sept. 2006