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Nosecone Calorimeter Simulation Status

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  1. Nosecone Calorimeter SimulationStatus Vasily Dzhordzhadze University of California, Riverside Forward Upgrade Workshop BNL, August 18-19, 2004 V.Dzhordzhadze

  2. Outline • General overview • Two approaches: Standalone and PISA • Resolutions • c2 estimator • Event Reconstruction and Energy measurements • Jets in NCC • PISA Preparations • Summary V.Dzhordzhadze

  3. Problems: -only 40 cm apart from collision point … -only 20 cm of space is available … and then …3.5 Labs of dead material downstream FST Layout: PHENIXforward spectrometers V.Dzhordzhadze

  4. Incoming electron (10GeV) g/p0 identifier 10 GeV electron 20 cm hadronic EM 40 cm front view side view • First 8.cm: 16 layers of Tungsten (2.5 mm), Si(0.3 mm), G10(0.8 mm), Kapton (0.2 mm) and Air(1.2 mm). • After first 6 layers there is a 0.5mm thick double layer of Si,G10,Kapton,Air (this is the g/p0 identifier). • Second half has a 6 layers with same sequence of materials, only thickness of Tungsten 16.6 mm. V.Dzhordzhadze

  5. How to build this calorimeter ….. Internal structure (not in scale). Tungsten plates 2.5 mm Spacers glued to W 2.5 mm • Constrains: • Structure in place prior to SVT installation; • Easy access for repairs/replacements; • Minimal power consumption – no forced cooling; • Compact signal processing plant – no competition for the real estate on magnet pole; V.Dzhordzhadze

  6. Number of channels • Section 1, 2 and 3 : Pad size 15 x 15 mm • +/-36 cm 2304x16=36864 • +/-48 cm 4096x6=24576 • Total number of channels 60840 • g/p0 identifier 60mm/32 • 1 strip =1.875 mm 384x2=768 V.Dzhordzhadze

  7. Energy Reconstruction • Section 1 [1-6], 2 [7-16] and 3 [17-22]: Pads 15 x 15 mm • g/p0 identifier 60mm/32 strip • E =a1 E1 + a2 E2 + a3 E3 F = (SiaiEi – E )2 • dF/da1 = 0 dF/da2= 0 dF/da3 = 0 • System of Linear equations • a1 = 66.97 , a2 = 84.29 , a3 = 280.67 V.Dzhordzhadze

  8. Resolution for 10 GeV electron V.Dzhordzhadze

  9. Resolution for 1,5,10,40 GeV electron 1 5 1 10 40 V.Dzhordzhadze

  10. Energy Resolution s, MeV s ~ 20%/E1/2 E 1/2 V.Dzhordzhadze

  11. Energy Resolution s, MeV E 1/2 V.Dzhordzhadze

  12. Shower profiles for 10 GeV electron X Z W= 0.9 cm V.Dzhordzhadze

  13. J/Y->ee in NCC V.Dzhordzhadze

  14. J/Y->e+e- mass spectrum s = 462 MeV V.Dzhordzhadze

  15. Coordinate resolution for J/Y->ee 968 mm V.Dzhordzhadze

  16. NCC response on 1 GeV pions and electrons V.Dzhordzhadze

  17. NCC response on 5 GeV pions and electrons V.Dzhordzhadze

  18. NCC response on 10 GeV pions and electrons V.Dzhordzhadze

  19. de/dx in Silicon for Section 1 V.Dzhordzhadze

  20. de/dx in Silicon for Section 2 V.Dzhordzhadze

  21. de/dx in Silicon for Section 3 V.Dzhordzhadze

  22. Fitting of de/dx , NCC Sec1 V.Dzhordzhadze

  23. Fitting of de/dx , NCC Sec2 V.Dzhordzhadze

  24. Fitting of de/dx , NCC Sec3 V.Dzhordzhadze

  25. Fitting of rms , NCC Sec1 V.Dzhordzhadze

  26. Fitting of rms , NCC Sec2 V.Dzhordzhadze

  27. Fitting of rms , NCC Sec3 V.Dzhordzhadze

  28. c2 distribution • c2 Estimator for NCC Si (ei - < ei >)2 / rms2i = 1, 3 V.Dzhordzhadze

  29. c2 distribution for 1 GeVelectrons and pions V.Dzhordzhadze

  30. c2 distribution for 5 GeVelectrons and pions V.Dzhordzhadze

  31. c2 distribution for 10 GeVelectrons and pions V.Dzhordzhadze

  32. Electron selection /p rejections in % • c2 cut 5.0 7.5 10.0 1GeV 83.2/100 93.3/99.1 97.4/78.0 5GeV 78.1/100 88.9/100 93.1/100 10GeV 76.2/100 87.1/100 92.2/100 20GeV 79.5/100 88.1/100 91.9/100 40GeV 76.7/100 85.1/100 89.8/100 V.Dzhordzhadze

  33. NCC Simulation of Jets V.Dzhordzhadze

  34. NCC Simulation of Jet + single g V.Dzhordzhadze

  35. Jet + soft particles V.Dzhordzhadze

  36. Jet energy reconstruction V.Dzhordzhadze

  37. Jet energy ratio - reconstructed / simulated V.Dzhordzhadze

  38. Jet energy ratio - reconstructed / simulated V.Dzhordzhadze

  39. NCC Simulation of 10 GeV Single electrons in PISA V.Dzhordzhadze

  40. NCC Simulation of 10 GeV Single electrons in PISA V.Dzhordzhadze

  41. NCC Simulation of 10 GeV Single muons in PISA Geant particle types V.Dzhordzhadze

  42. NCC Simulation of 20 GeV Single muons in PISA Z coordinate Z V.Dzhordzhadze

  43. NCC Simulation of 10 GeV Single muons in PISA 130 KeV dedx, KeV V.Dzhordzhadze

  44. NCC Simulation of 10 GeV Single electrons in PISA X vs Y Y X V.Dzhordzhadze

  45. Summary • Geant 3 based NCC simulation code is written • NCC code is ready for working into the PISA environment • NCC resolution ~ (20-23)%/E1/2 was obtained • Coordinate resolution of the g detector < 1 mm • J/Y-> ee decay and reconstruction by the NCC was performed. 72% of events were reconstructed: s = 462 MeV • Pion rejection and Jet reconstruction with NCC wasstudied V.Dzhordzhadze

  46. J/Y->m+m- Yield and Resolutions Nosecone HCAL J/Y Width Signall x0 GeV/c2 events --------------------------------------------------------------------------------- Cu 19 cm No 155+/-10 176+/-13 4.84 47.4 W 9 cm No 163+/-11 165+/-13 4.52 59.8 W 7 cm No 155+/-13 160+/-13 4.31 54.1 W 9 cm Yes 175+/-12 153+/-12 5.84 73.8 W 7 cm Yes 162+/-12 140+/-12 5.63 68.1 V.Dzhordzhadze

  47. Details of the Geometry V.Dzhordzhadze

  48. Materials used in NCC G10 0.8 mm Ka 0.2 mm Tungsten 2.5 mm or 16.6 mm Si 0.3 mm Air 1.2 mm 4-40 cm 4-50 cm V.Dzhordzhadze

  49. 40 GeV electron display V.Dzhordzhadze