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Scintillator-based Hadron Calorimeter: Prototyping and Studies for Tail-Catcher/Muon Tracker

This study focuses on the hardware prototyping and MC studies of a scintillator-based 2-bit hadron calorimeter for the Tail-Catcher/Muon Tracker. The goal is to optimize the design for better energy resolution and efficiency.

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Scintillator-based Hadron Calorimeter: Prototyping and Studies for Tail-Catcher/Muon Tracker

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  1. Prototyping Studiesfora Scintillator (semi)Digital HCalanda Tail-Catcher/Muon Tracker Vishnu V. Zutshi for NIU/NICADD

  2. Outline • A scintillator-based 2-bit hadron calorimeter MC studies Hardware Prototyping Plans • Tail-catcher/Muon tracker MC studies Hardware Prototyping Plans V. Zutshi, ICLC04, Paris

  3. N vs. E (single hadrons) 0.25mip threshold V. Zutshi, ICLC04, Paris

  4. Simple counting of cells above threshold Single Particle E Resolution Non-projective geometry V. Zutshi, ICLC04, Paris

  5. Parameterized Jet E Resolution • Energy Smearing Fit s as a function of incident E (slide4) and smear neutral hadrons accordingly g ~ 17%/sqrt(E), generated E for charged hadrons • Jet Reconstruction pT order stable MC particles (ignoring neutrinos) start with highest pT particle and cluster in 0.7 cone repeat for remaining particles V. Zutshi, ICLC04, Paris

  6. 9cm2 cells Single Particle Resolution (10GeV) s/E=0.183 s/N=0.166 V. Zutshi, ICLC04, Paris

  7. 9cm2 cells Single Particle Resolution (50GeV) s/E=0.101 s/N=0.153 V. Zutshi, ICLC04, Paris

  8. Can be flattened with multiple thresholds The Culprit V. Zutshi, ICLC04, Paris

  9. After threshold-based weighting of cells Single Particle Resolution (50 GeV) s/E=0.101 s/E=0.092 V. Zutshi, ICLC04, Paris

  10. Similar treatment to 10 GeV…. s/E=0.183 s/N=0.164 V. Zutshi, ICLC04, Paris

  11. Applying Photo-Statistics Smearing V. Zutshi, ICLC04, Paris

  12. Layer Stack V. Zutshi, ICLC04, Paris

  13. Cosmic Data with PMT Started with 11pe now~14 p.ebeing regularly achieved V. Zutshi, ICLC04, Paris

  14. Efficiency vs. Noise Rejection V. Zutshi, ICLC04, Paris

  15. Si-PM and MRS Pixilated (500 to 1000 on ~1mm2) Geiger mode sensor with high gain and modest Quantum*geom. efficiency P. Buzhan et. al V. Zutshi, ICLC04, Paris

  16. Si-PM’s V. Zutshi, ICLC04, Paris

  17. Cosmic Data with Si-PM nPE V. Zutshi, ICLC04, Paris

  18. MRS Dark Noise Rate V. Zutshi, ICLC04, Paris

  19. Surface Treatment/Wrapping V. Zutshi, ICLC04, Paris

  20. Thickness vs. weight • If weight and thickness track each other, then it may be possible to monitor paint application via weight only • Check to see if thickness and weight track each other by plotting thickness vs. weight: 2nd set V. Zutshi, ICLC04, Paris

  21. Optical x-talk + source spillage X-talk V. Zutshi, ICLC04, Paris

  22. Cells Fabricated V. Zutshi, ICLC04, Paris

  23. Eljen extruded Normalized Response Bicron Since light ample, can optimize for ease of construction V. Zutshi, ICLC04, Paris

  24. Sigma Groove Uniformity V. Zutshi, ICLC04, Paris

  25. Straight Groove Uniformity V. Zutshi, ICLC04, Paris

  26. Scanning over the neighbors V. Zutshi, ICLC04, Paris

  27. Rainbow Groove V. Zutshi, ICLC04, Paris

  28. Overall dispersion<10% Response Dispersion V. Zutshi, ICLC04, Paris

  29. 0.993  0.006 RESPONSE LONG AFTER PRODUCTION V. Zutshi, ICLC04, Paris

  30. Scint. (s)DHCAL looks like a very competitive option…. Summary/Plans • Simulations indicate approach competitive with analog • Prototypes indicate there is sufficient sensitivity (light x efficiency) & uniformity. • Outlook for optimizing materials & construction to minimize cost looks promising • Intend to take part in the CALICE test beam in collaboration with the Tile-Cal group V. Zutshi, ICLC04, Paris

  31. Tail-catcher/Muon System V. Zutshi, ICLC04, Paris

  32. Goals for the TC/Muon System • Provide a reasonable snapshot of the tail-end of the shower for simulation validation • Prototype detector with high-fidelity to what is imagined for a generic LCD correcting for leakage understanding the impact of coil muon reconstruction + eflow fake rate V. Zutshi, ICLC04, Paris

  33. For charged pions with >5% of E inside TC On tail-catching 10cm absorber plates V. Zutshi, ICLC04, Paris

  34. Accounting for material in the coil... 135%/sqrt(E) V. Zutshi, ICLC04, Paris

  35. Erec/Egen 50 GeV p V. Zutshi, ICLC04, Paris

  36. Fake Jets • Needed to judge the hit occupancy near the muon track • B*  B + p(35GeV) | D* + m(15GeV) | p(20GeV)+K(15GeV)+p(10GeV) • Particles are produced in 0.05 cone individually and G4 simulated hits are combined in the analysis program V. Zutshi, ICLC04, Paris

  37. Fake Jet Angular Width (dR = 0.05) TC view ECal view V. Zutshi, ICLC04, Paris

  38. s(X) w.r.t. previous layer V. Zutshi, ICLC04, Paris

  39. Stripification • Assign tail-catcher hits to strips of a given size in analysis software • Obtain x or a y co-ordinate from alternate lyrs • Take all combinations • Efficiency is defined as the ratio of the no. of times a pairwise muon hit is found within a road in lyrs N+1 and N+2 when it was present in N and N+1 • Rejection = 1-p where p is the fraction of times a non-muon hit combination was present in the road V. Zutshi, ICLC04, Paris

  40. Sets the size of the search road s(X) with strips V. Zutshi, ICLC04, Paris

  41. 1cm wide strips Pairwise ‘Efficiency’ V. Zutshi, ICLC04, Paris

  42. 1cm wide strips ‘Rejection’ V. Zutshi, ICLC04, Paris

  43. For >99% efficiency…. V. Zutshi, ICLC04, Paris

  44. Current Guess • “Fine” section (8 layers) 2cm Steel, 0.5 cm thick scintillator • Following “coarse” section (8 layers) 10cm Steel, 0.5 cm scintillator • 5cm wide strips, 1m long • Tyvek wrapping • Alternating x-y orientation • Si-PM photo-detection V. Zutshi, ICLC04, Paris

  45. 10cm wide, 5mm thick Fermi-NICADD Extruder Line V. Zutshi, ICLC04, Paris

  46. First Measurements V. Zutshi, ICLC04, Paris

  47. Uniformity V. Zutshi, ICLC04, Paris

  48. Provides better rigidity Separation Grooves 1 2 3 4 5 Epoxy/paint mixture V. Zutshi, ICLC04, Paris

  49. Response V. Zutshi, ICLC04, Paris

  50. X-talk V. Zutshi, ICLC04, Paris

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