The Hadron Production Experiment at the PS, CERN
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1 Geant4 in HARP The Hadron Production Experiment at the PS, CERN P.Arce and V.Ivanchenko For the HARP Collaboration Geant4 Workshop 30 September 2002
2 HARP Collaboration Università degli Studi e Sezione INFN, Bari, Italy Rutherford Appleton Laboratory, Chilton, Didcot, UK Institut für Physik, Universität Dortmund, Germany Joint Institute for Nuclear Research, JINR Dubna, Russia Università degli Studi e Sezione INFN, Ferrara, Italy CERN, Geneva, Switzerland Section de Physique, Université de Genève, Switzerland Laboratori Nazionali di Legnaro dell' INFN, Legnaro, Italy Institut de Physique Nucléaire, UCL, Louvain-la-Neuve, Belgium Università degli Studi e Sezione INFN, Milano, Italy P.N. Lebedev Institute of Physics (FIAN), Russian Academy of Sciences, Moscow, Russia Institute for Nuclear Research, Moscow, Russia Università "Federico II" e Sezione INFN, Napoli, Italy Nuclear and Astrophysics Laboratory, University of Oxford, UK Università degli Studi e Sezione INFN, Padova, Italy LPNHE, Université de Paris VI et VII, Paris, France Institute for High Energy Physics, Protvino, Russia Università "La Sapienza" e Sezione INFN Roma I, Roma, Italy Università degli Studi e Sezione INFN Roma III, Roma, Italy Dept. of Physics, University of Sheffield, UK Faculty of Physics, St Kliment Ohridski University, Sofia, Bulgaria Institute for Nuclear Research and Nuclear Energy, Academy of Sciences, Sofia, Bulgaria Università di Trieste e Sezione INFN Geant4 in HARP
3 HARP goals Cross sections for protons and pions in the energy range (1.5-15) GeV The data for the neutrino factory source optimization The data for calculation of meson flax from atmospheric neutrino The data for K2K and MiniBooNE experiments The data for Geant4 hadronic models Geant4 in HARP
4 Detector layout Large Acceptance and Particle ID cherenkov spectrometer magnet forward trigger forward RPC TPC/RPC solenoid magnet TOF wall electron identifier muon identifier characterized beam drift chambers Neutrino Factory: ~2-24 GeV Atmospheric PS East meson Area beams: flux: GeV GeV Geant4 in HARP
5 The HARP Experiment Beam Instrumentation and Trigger Large Angle Detectors Forward Spectrometer Software Online Offline EM Wall TOF Wall Cherenkov Drift Chambers Forward RPC Barrel RPC TPC Muon Catcher Forward Trigger Inner Trigger Trackers MWPC Beam TOFs Beam Cherenkovs Large Parallel Effort in Design and Construction Geant4 in HARP
6 12 GeV/c p RPC Large Angle detectors Geant4 in HARP
7 Forward Spectrometer: Drift Chambers A simple beam pion Nomad Drift Chamber Module (4x3 planes) Nomad Drift Chamber Module (4x3 planes) Nomad Drift Chamber Module (4x3 planes) Beam Cherenkov Dipole Spectrometer Cherenkov TOF Wall Geant4 in HARP
8 HARP at T9 Geant4 in HARP
9 HARP History & Strategy Approved in 1999 Construction from st run 2001 (~10 8 triggers) 2nd run 2002 (~10 8 triggers) Software project from 2000 Component approach, OO design and c++ Geant4 is one of the main external packages for HARP Positive and negative beams Momentums: 1.5, 3, 5, 8, 10, 12.2, 15 GeV/c Solid targets: Be, C, Al, Cu, Sn, Ta, Pb Target depth in nuclear interaction length 2%, 5%, 100% Special targets: Al(K2K), Be (MiniBooNE) Liquid targets: H 2 O, H 2 /D 2, O 2 /N 2 Geant4 in HARP
10 Software architecture DetResponse HarpUI Reconstruction Simulation Event Selector Objy Persistency DetRep ObjyHarp ObjectCnv HarpDD HarpEvent Gaudi Framework DAQ ROOT GEANT4 CLHEP + STL STL HEPODBMS Objectivity DATE Geant4 in HARP
11 Geant4 in HARP Gaudi Framework (LHCb) for all HARP offline applications G4 UI interface is provided by Gaudi UI Any combination of subdetectors and sensitive detectors can be defined for a given run User have several choices for Event generator Hadronic physics Stepper algorithm TPC and Dipole magnetic field parameterizations Hadronic generator for the target Geant4 in HARP
12 HARP geometry Geant4 geometry description is used for simulation, reconstruction, and event display Extrapolator provides propagation of reconstructed tracks between subdetectors PS T9 beam line is described and implemented ASCII files with a few tags (CMS): Logical volume Boolean operation Positioning Replica Positioning of parameterized volumes Rotations Materials Mixtures Geant4 in HARP
13 HARP Geant4 simulation Sensitive Detectors, Stepping and Tracking actions are defined for subsystems independently Hits are stored in Gaudi Event Store Digitization is separated from hit production Digi are stored in Gaudi Event Store in the format of Reconstruction hits and can be processed as experimental data Two types of persistency exist for simulation: ASCII files and ObjectivityDB Geant4 in HARP
14 NDC Detector Response GEANT4 HdrNdcSD McVertex McParticle McBaseHit HdrNdcMCHitAlg McNdcHit NdcHit HdrNdcMCDigiAlg Gaudi Geant4 in HARP
15 Detector Response Simulation EM Calorimeter Ndc 3 GeV Data MC Geant4 in HARP
16 HARP event generators Standard generator HARPgun G4GeneralParticleSource ASCII input, filled from experimental events T9 beam line simulation 72 meters of PS beam transport from the target to T9 hall have been performed. The mail goal: to control beam parameters. Geant4 in HARP
17 HARP background study In 2001 experiment background was 4 times higher than expectations In order to understand the background special Geant4 study was performed Beam parameters were extracted from the data using MWPC and beam counters Simulation were done with and without target Background events were traced back Geant4 in HARP
18 Results of background study Main sources of background are following: Multiple scattering on beam counters and TPC walls (29 %) Bremsstrahlung of beam electrons/positrons on beam counters and TPC walls with further conversion on other walls (33 %) d-electron production on beam counters and TPC walls (26 %) d-electrons production in air (12 %) Simple shielding is not effective! As a result the program to optimize HARP trigger for 2002 run have been formulated Geant4 in HARP
19 Hadron Production The process of hadron production is designed. It is active only in the target and only for primary track Interaction point is forced to be distributed along the target One of the following secondary generators can be used: Elastic user defined angular distribution Exclusive user defined final state Parametrised (GHEISHA) Chiral invariant phase space (CHIPS) String fragmetation + CHIPS Geant4 in HARP
20 Benchmark for G4 hadron physics A benchmark is designed to study G4 hadronic generators The goals: Analysis strategy Acceptance calculation Studying hadronic generators Gaudi framework is used No secondary interactions One can study: Multiplicity of final states Inclusive spectra Angular distributions Invariant masses Geant4 in HARP
21 Conclusions HARP data taking will be completed in 10 days Currently the calibration and alignment of HARP subsystems are in progress Geant4 simulation of HARP is working and used as for calibration and for subdetector studies Geant4 was used for trigger optimization The results of HARP experiment will be utilized in Geant4 for testing and tuning of hadronic models in the energy range GeV The collaboration between HARP and Geant4 is fruitful and effective Geant4 in HARP
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