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FLUKA Energy deposition study : Early separation scheme with Dipole D0 First Results

FLUKA Energy deposition study : Early separation scheme with Dipole D0 First Results. Christine HOA (AT-MAS-MA), Guido STERBINI (AT-MAS-MA),. Outline. LHC Upgrade configuration with D0 FLUKA energy deposition calculations Monte Carlo code Modeling parameters

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FLUKA Energy deposition study : Early separation scheme with Dipole D0 First Results

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  1. FLUKA Energy deposition study : Early separation scheme with Dipole D0First Results Christine HOA (AT-MAS-MA), Guido STERBINI (AT-MAS-MA), Energy deposition study on D0

  2. Outline • LHC Upgrade configuration with D0 • FLUKA energy deposition calculations • Monte Carlo code • Modeling parameters • D0 results for energy deposition • Investigations: P-P collisions • Next steps • Conclusions Energy deposition study on D0

  3. Q3 Q2 Q1 Q1 Q2 Q3 D0 D0 IP LHC Upgrade configuration with D0 • Early scheme D0 dipole Upgrade luminosity: 10 35cm-2 s-1 Total power: 18 kW Question: Energy deposition in the dipole? … in the IR quads? Energy deposition study on D0

  4. FLUKA: Monte Carlo code • Multi-particle transport code • CERN/INFN development • A. Ferrari, P.R Sala, A. Fassò, J.Ranft • Fluka team with technical support at CERN • Version 2006, not yet released • Including DPMJET Event Generator for the p-p collisions GEOMETRY Magnetic field Source particles DTUJET, DPMJET Simplegeo V.2, ROXIE, … DPMJET FLUKA Particles tracking Interactions/ Transport Energy deposition Post-treatments Flukaplot.r, Simplegeo, fluka Gui, MATLAB, Mathematica Energy deposition study on D0

  5. FLUKA: Modeling parameters Energy deposition study on D0

  6. FLUKA: Modeling parameters • Beam parameters Energy deposition study on D0

  7. FLUKA: Modeling parameters • Meshing • Cartesian mesh: 0.2*0.2*2 cm • Physical meaning with respect to quench limit related to minimum cable dimension (width of 1-2 mm) (discussion with D. Tommasini) • Computing parameters • Nb of particles for good statistics: 3*1000 particles (CPU time 16 hours) • Cut-off parameters Energy deposition study on D0

  8. FLUKA: D0 results • Without magnetic field 1st slide of the dipole Z=[0,2] cm Energy deposition study on D0

  9. FLUKA: D0 results • Without magnetic field 36 mW/cm3 12 mW/cm3 Energy deposition study on D0

  10. FLUKA: D0 results • With a constant magnetic field of 6 T Energy deposition study on D0

  11. FLUKA: D0 results • With a constant magnetic field of 6 T Energy deposition study on D0

  12. FLUKA: D0 results • Comparing results: deposited power in D0 [Mokhov]: “Beam induce energy deposition studies in IR Magnets”, April 2006, WAMDO workshop Energy deposition study on D0

  13. FLUKA: D0 results • Summary • 34 W deposited power in the dipole • no influence of the magnetic field • Opening questions • Why such a small value? • Investigation on the p-p collision: Spatial distribution and energy range Energy deposition study on D0

  14. X  Z P-P collisions analyses • Aim: Distribution of secondaries w.r.t of energy range and space Polar distribution:  from 0 to 180 Sphere: 180 ring regions p-p collision at 14 Tev Upgrade Luminosity 1035 cm-2.s -1 18kW Y Energy deposition study on D0

  15. P-P collisions analyses • Far field region of the interaction at R>3.5m Energy deposition study on D0

  16. D0 dipole IR=3.5 cm OR=5 cm =0.75 =0.35 1 m 3.5 m P-P collisions analyses • Spatial distribution (no crossing angle) IP Energy deposition study on D0

  17. P-P collisions analyses • Scaling law for aperture radius Energy deposition study on D0

  18. P-P collisions analyses • Power spectrum in D0 dipole 1 Gev-100 Gev : narrow power spectrum 62% Charged particles 38% Neutral particles 30% Photons Energy deposition study on D0

  19. Photon total energy in D0: 44 W most of this energy is deposited in D0 P-P collisions analyses • Power spectrum in D0 dipole Energy deposition study on D0

  20. Next steps • Origins of the energy deposition • More details on charged particles? • To take into account • Crossing angle : small effects expected? • Magnetic field of the Solenoid: small effects expected? Energy deposition study on D0

  21. Conclusions • FLUKA results: 34 W of power deposition  Good surprise! • Understanding of this result • Z> 3.5 m :far field region of the p-p interactions • High energetic particles channeled in the beam pipe • Impinging energy in the dipole at 3.5 m: 144 W • Solutions to decrease the energy deposition: • Increase the aperture of D0 • front absorber Energy deposition study on D0

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