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Results from simulations of the production of secondary particles at the pipe walls

Results from simulations of the production of secondary particles at the pipe walls. M.Baznat 1 , K.K.Gudima 1 , E.I.Litvinenko 2 , Yu.Murin 2 1 Institute of Applied Physics, Academy of Science of Moldova, Moldova 2 JINR Dubna, Russia. Outline. Motivation of this study for CBM

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Results from simulations of the production of secondary particles at the pipe walls

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  1. Results from simulations of the production of secondary particles at the pipe walls M.Baznat1, K.K.Gudima1, E.I.Litvinenko2 , Yu.Murin2 1Institute of Applied Physics, Academy of Science of Moldova, Moldova 2JINR Dubna, Russia The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  2. Outline • Motivation of this study for CBM • LAQGSM generator • Rapidity • Transport of the spectators – nuclear fragments • Testing configurations of the beam pipe at the STS region • Secondary particles and the pipe walls • Conclusion The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  3. LAQGSM high-energy event generator LAQGSM describes reactions induced by both particles and nuclei at incident energies up to about 1 TeV/nucleon, generally, as a three-stage process: IntraNuclear Cascade (INC), followed by pre-equilibrium emission of particles during the equilibration of the excited residual nuclei formed after the INC, followed by evaporation of particles from and/or fission of the compound nuclei. The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  4. LAQGSM related publicaitons • LAQGSM03.03:a) “CEM03.03 and LAQGSM03.03 Event Generators for the MCNP6, MCNPX, and MARS15 Transport Codes” S. G. Mashnik, K. K. Gudima, R. E. Prael, A. J. Sierk, M. I. Baznat, and N. V. Mokhov, LANL Report LA-UR-08-2931 ; E-print: arXiv:0805.0751v2 [nucl-th] 12 May 2008b) S. G. Mashnik et al., LANL Report LA-UR-07-6198; E-print: arXiv:0709.173v1 [nucl-th] 12 Sep 2007.c) K. K. Gudima and S. G. Mashnik, Proc. 11th Internat. Conf. on Nuclear Reaction Mechanisms, Varenna, Italy, June 12–16, 2006, edited by E. Gadioli (2006) pp. 525–534; E-print: nucl-th/0607007. • LAQGSM03.01:S. G. Mashnik et al., LANL Report LA-UR-05-2686, Los Alamos (2005). • LAQGSM:K. K. Gudima, S. G. Mashnik, A. J. Sierk, LANL Report LA-UR-01-6804, Los Alamos, 2001. • Quark-Gluon String Model (QGSM):N. S. Amelin, K. K. Gudima, V. D. Toneev, Sov. J. Nucl. Phys. 51 (1990) 327–333;[Yad. Fiz. 51 (1990) 512–523]. Sov. J. Nucl. Phys. 51 (1990) 1093–1101; [Yad. Fiz. 51(1990) 1730–1743]. Sov. J. Nucl. Phys. 52 (1990) 1722–178, [Yad. Fiz. 52 (1990) 272–282] The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  5. LAQGSM Au-Au sqrt(S)=5AGeV rapidity (5000 events) The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  6. Interface to LAQGSM data Class constructor: MpdLAQGSMGenerator (const char* fileName, const Bool_t use_collider_system=kTRUE); --------------------------------- Class usage in simulation macro: fRun->SetName("TGeant4"); MpdLAQGSMGenerator* guGen= new MpdLAQGSMGenerator(filename); primGen->AddGenerator(guGen); The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  7. The special testing configuration A: Geometry: Muon Magnet + 30 silicon planes: 0.3mm 0.004mm 15 meters Event generator: LAQGSM Input: a) “beam”, b) Au-Au, c) Au-p; Sqrt(S)=5 AGeV Transport: Geant4 The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  8. A:Transport of “the beam” with this configuration The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  9. A:LAQGSM Au-Au sqrt(S)=5 AGeV 5000 events transported fragments The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  10. A: LAQGSM p-Au sqrt(S)=5 AGeV 5000 events transported fragments The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  11. A:Primary protons and fragments at z=50 and z=100 cm AuAu: pAu: Protons, z=50cm Protons, z=100cm Fragments, z=100cm The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  12. The special testing configurations B and C: Geometry: Muon Magnet + 8 silicon planes: B: Be–1mm 1.6º, Al -2mm 2.9º inside pipe: vacuum C: Be–2mm 2.5º, Al -2mm 2.5º, inside pipe: vacuum, or helium 0.08mm Event generator: LAQGSM Pipe: conical tube from Be or Al (with wall 2mm, and in B case 1mm Be) STS: 8 plane silicon stations 0.08mm, 10cm around the pipe, standard positions Collision: Au-Au Sqrt(S)=5 GeV/u Transport: Geant4 The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  13. B:Vertexes (r,z) of secondary particles, which came to STS planes(2200 LAQGSM events) Al 2mm: Be 1mm: 100% 114%[100%] The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  14. B:Vertexes (r,z) of secondary electrons, which came to STS planes (2200 LAQGSM events) Al 2mm: Be 1mm: 76% (100%) 80% [70%](104%) The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  15. B:Vertexes (r,z) of the secondary particles, which came to STS planes, that belong to the pipe wall Al 2mm: Be 1mm: 53% {100%} 70% [61%]{131%} The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  16. C: Secondary particles born in the pipe wall (1000events) 100% 100.5% 2mmBe+helium: 2mm Be+vacuum: 111% 114% 2mmAl+helium: 2mmAl+vacuum: B: Be 1mm - 78% ; Al 2mm – 102% The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  17. Maximal hit densities (per cm2 per event) C: B: Al+vac Al+hel Be+vac Be+hel Al 2mm Be 1mm all b<10 b<10prim The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  18. C: Secondary particles – hit density per cm2 per event z=30cm z=50cm z=100cm Be+vac z=30cm Max=0.21 z=50cm Max=0.26 Max=0.18 Max=0.07 Al+vac Max=0.23 Max=0.2 Max=0.07 The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  19. C: Secondary electrons – hit density per cm2 per event Be+vac z=30cm Max=0.25 z=50cm Max=0.18 Al+vac z=30cm Max=0.21 z=50cm Max=0.14 The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  20. C: Secondary electrons for different b ranges Be+vac z=30cm z=100cm z=50cm Al+vac The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  21. B: Secondary electrons for different b ranges Al+vac z=30cm z=50cm z=100cm Be+vac The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  22. Conclusion • The pipe walls made from aluminium and berillium are very similar in respect to the secondary particle production (only 10% difference, but Al is much cheaper). • The pipe cone angle less than 2.5° has the following disadvantages: -- big part of the spectator particles, which should be measured to define the centrality of the event, can not be registered by PSD; -- these spectator particles create a lot of secondary particles when pass through the pipe walls and when pass through the STS parts made from silicon. The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  23. BACKUP SLIDES The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  24. The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  25. LAQGSM intranuclear cascade model The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  26. The latest improvements of LAQGSM code The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  27. B:Vertexes (r,z) of secondary particles, which came to STS planes The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  28. The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  29. The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  30. B:All particles – hit distributions (arb.scale) Be 1mm: z=50cm z=30cm Al 2mm: z=50cm z=30cm The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  31. Magnetic field behaviour near x=0 z=100cm The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

  32. Experimental data : the deposited energy for different types of spectators in dependence of the centrality The NA49 collaboration. Eur. Phys. J., A2, 383, (1998) At large impact parameters the most of spectatornucleons are bound in fragments. The 3rd Work Meeting of the CBM-MPD STS Consortium, 1–4 June 2009, Sortavala, Karelia, Russia

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