Using transport calculations as event generators to design experiments
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1 Using transport calculations as event generators to design experiments Jerzy Łukasik IFJ PAN Kraków, Poland Transport 2017: International Workshop on Transport Simulations for Heavy Ion Collisions under Controlled Conditions FRIB-MSU, March 27-30, 2017 Work supported by Polish National Science Center (NCN) Contract No. UMO-2013/10/M/ST2/00624
2 Outline UrQMD + GEANT4 RIKEN (2016) ASY-EOS FAIR (2019?)
3 Work flow PHITS generate events perform some *MD simulations (*UU*, SMM???) define clusters (event-by-event) estimate excitation energies account for secondary decays (in flight?) randomize the reaction plane transform to LAB propagate to detectors, account for interactions with matter (energy loss, multiple Coulomb scattering, ionization, e-/h+ production, scintillation, light propagation, secondary reactions, δ electrons, Cherenkov, bremsstrahlung), magnetic/electric fields, etc account for unstable particle decays GEANT4 / some MC design experiments infer/optimize the detector properties and performance (material, geometry, granularity, readout system, etc.) estimate efficiencies (geometric, detection, triggering, trapping) estimate energy losses, doses, timing properties, etc. support data analysis
4 UrQMD main advantages as an event generator relativistic dynamics first order effects accounted for (mean field (HARD EOS), collisions, Pauli blocking) particle production open source ( documented, maintained, easy to run
5 RIKEN (2016) Determination of the density and momentum dependence of the EOS at supra-saturation densities Stable and radioactive systems at 300 AMeV 132 Sn+124Sn; 124Sn+112Sn 108 Sn+112Sn; 112Sn+124Sn Observables: ratios: π /π+, n/p, t/3he, flow: n, p, t, 3He Main detectors: SPiRIT TPC inside SAMURAI KYOTO + KATANA NeuLAND
6 RIKEN (2016) UrQMD+GEANT4 simulation
7 RIKEN (2016) KYOTO KATANA VETO SPiRIT TPC KATANA ACTIVE COLLIMATOR KYOTO UrQMD+GEANT4 simulation
8 High TPC gain to detect pions and light charged particles & beam particles and heavy fragments pass through the TPC keep gating grid closed for Z>20 KATANA: 3 Veto bars centered around the beam position 12 Multiplicity bars (7 on right + 5 on left) UrQMD+GEANT4 simulation
9 UrQMD + clustering: 300 AMeV UrQMD+GEANT4 simulation
10 Max energy loss in Veto bars Bethe-Bloch: ΔE~AZ2/E UrQMD+GEANT4 simulation
11 Veto efficiency for heavy charges UrQMD+GEANT4 simulation
12 Trigger efficiency vs b UrQMD+GEANT4 simulation
13 MULT vs impact parameter UrQMD+GEANT4 simulation
14 Trigger efficiency vs MULT UrQMD+GEANT4 simulation
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17 ASY-EOS FAIR (2019?) Determination of the density dependence of the EOS at supra-saturation densities Symmetric and asymmetric systems 108 Sn, 132Sn, 0.4, 1, 1.2 AGeV Observables: ratios: n/p, t/3he, π /π+(?) flow: n, p, t, 3He Main detectors: NeuLAND, FOPI PlasticWall / ALADIN TOF-Wall, Trigger/Reaction Plane detector around the target
18 Trigger/Reaction Plane detector around the target requirements: should cover angles > 30o, high segmentation in azimuthal angle, high geometrical efficiency, low multihit probability, fast timing
19 UrQMD + clustering: Au+Au 1000 AMeV, 0-10 fm, 200 fm/c better correlation
20 UrQMD + clustering: Au+Au 1000 AMeV, 0-10 fm, 200 fm/c Z>0, NO PIONS 5 segments
21 UrQMD + clustering: Au+Au 1000 AMeV, 0-10 fm, 200 fm/c LCP+IMF PIONS
22 Trigger/Reaction Plane detector around the target: 5 rings of 4x4 mm2 fast scintillating fibers (e.g. BCF-20) read out by SiPMs covers angles from 30o to 165o, segmentation assures more or less uniform count rates for Au+Au at 1 AGeV, geometrical efficiency ~95% ~10% of charged particles involved in multihits, ~5% multihit probability sufficiently large for radioactive beams sufficiently small and lightweight not to disturb neutrons min radius - 6 cm, max radius - 12 cm length 43 cm 180 segments in forward rings 90 segments in backward ring 810 channels
23 hits/segment SciFi segment number
24 PIONS??? π!0!0!0!0! Sum of QDC in that plane bypaolo Russotto Last fired plane
25 NeuLAND can resolve pions from protons but can we distinguish pi+ from pi-? bypaolo Russotto Protons pi+ pi-
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28 Summary *MD* codes extremely useful to design experiments and detectors Estimated trigger efficiency for the SPiRIT experiment Optimal design of the Trigger/Reaction Plane detector for the ASY-EOS II Detection of pions with NeuLAND feasible (?) A wish: Please do not give up! Please provide us model independent predictions on pion sensitivity to the symmetry energy (or predictions with theoretical error bars). Could it be possible to have, as the main outcome of the code comparison project, one QMD-like and one BUU-like best compromise, open source, user tunable and user friendly code? (with clustering, if possible...) a'la UrQMD but with reasonable EOS for symmetry energy studies
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