1 / 33

Towards A Scintillating (Semi)-Digital Hadron Calorimeter: Progress at NIU/NICADD Jerry Blazey

Towards A Scintillating (Semi)-Digital Hadron Calorimeter: Progress at NIU/NICADD Jerry Blazey Northern Illinois University. LC Activities at NIU/NICADD. Scintillator (Semi-)Digital Hadron Calorimeter Simulation and Hardware Studies – This Talk

edward-cleveland
Download Presentation

Towards A Scintillating (Semi)-Digital Hadron Calorimeter: Progress at NIU/NICADD Jerry Blazey

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Towards A Scintillating (Semi)-Digital Hadron Calorimeter: Progress at NIU/NICADD Jerry Blazey Northern Illinois University Jerry Blazey NIU/NICADD

  2. LC Activities at NIU/NICADD • Scintillator (Semi-)Digital Hadron Calorimeter Simulation and Hardware Studies – This Talk • Test Beam Plans for Scintillator Hadron Calorimeter & Tail-catcher – Vishnu Zutshi – This Session • G4-based Simulation Status & Plans – Guilherme Lima – Session 7 Friday 8:30 • Muon Simulation Development & Status – Arthur Maciel – Muon/PID Session Wednesday 1:00 Jerry Blazey NIU/NICADD

  3. “Generic” Calorimeter Simulations • First Design & Prototype & Results on Sensitivity and Threshold • Optimization of Unit Cells • Light Sensor Investigations Jerry Blazey NIU/NICADD

  4. A Generic Calorimeter:Number of Cells vs. Pion Energy 0.25mip threshold # of Cells 100 20 E For a 0.25 mip threshold # cells monotonically increasing with energy for a wide range of cell sizes. Jerry Blazey NIU/NICADD

  5. Digital vs. Analog Hits 10,50 GeV p Energy 10,50 GeV p Hits ECAL E ECAL Hits HCAL E HCAL Very similar correlations exist for hits or energy Between the EMCAL and HCAL Jerry Blazey NIU/NICADD

  6. Single Particle Energy Resolution • Minimize (Eo-S(aiLi))2 • ai calculated for 10 GeV & applied to all E which is conservative • i=2 for EMCAL & HCAL, also conservative Jerry Blazey NIU/NICADD

  7. Single Particle Energy Resolution Non-projective geometry s/E 0.1 20 E For lower energy particles digital approach has superior resolution! Jerry Blazey NIU/NICADD

  8. (s/E)dig (s/E)analog Resolution as a Function ofMultiple Thresholds or Bits 2 1 E * As in the previous slide, below 20 GeV digital resolution superior to analog. * At all energies, more bits superior. So it works for single particles how about jets? Jerry Blazey NIU/NICADD

  9. Toy Simulation: “Recipe” for a Jet • Determine resolution independent of algorithm • For ZZ events PT order stable MC particles, ignore n’s • For charged hadrons assume perfect energy (from tracker) • Smear the energy of other particles • For neutral hadrons use resolutions for charge pions (just discussed). • For photons use s ~ 17%/sqrt(E) • Start with highest pT particle and cluster in 0.7 cone • Repeat for remaining particles • Add individual energies to get jet energy Jerry Blazey NIU/NICADD

  10. ZZ Events: Sanity Checks Neutral hadron fraction Stable MC particles g fraction Energy Fractions Jerry Blazey NIU/NICADD

  11. Jet E Resolution 0.04 s/E 0.01 rms used Jet E(GeV) So the idea holds water: At all energies 3x3 single threshold resolution comparable to analog! Jerry Blazey NIU/NICADD

  12. Using full E-flow: Jet Erec/Egen Calorimeter only Eflow s = 0.25 s = 0.16 ~60% better (Vishnu Zutshi, ECFA-DESY Workshop, 1/4/2004 http://nicadd.niu.edu, presentation 0046) Jerry Blazey NIU/NICADD

  13. Full Eflow: Jet Erec/Egen Eflow digital (2cm2 cells) Eflow analog s = 0.17 s = 0.16 Digital approach not yet optimized but performance comparable to analog! Jerry Blazey NIU/NICADD

  14. Hardware Prototypes:Stack, Layer, & Unit Cell Clear Fiber MPTM Jerry Blazey NIU/NICADD

  15. Cosmic Data with PMT Readout ~11 p.e. peak = 1MIP Jerry Blazey NIU/NICADD

  16. 0.25 MIP threshold: efficient, quiet Jerry Blazey NIU/NICADD

  17. Cell Response Uniformity & Dispersion Cell-to-cell ~ 7% Uniformity ~ 3% Jerry Blazey NIU/NICADD

  18. Fiber Response Dominates: Dispersion ~ 6% Jerry Blazey NIU/NICADD

  19. Other Uniformity Measurements Jerry Blazey NIU/NICADD

  20. Relative Response Measurements Since light ample, can optimize for ease of construction Jerry Blazey NIU/NICADD

  21. Surface Treatment/Wrapping Paint easy, little light loss Jerry Blazey NIU/NICADD

  22. Miscellaneous Measurements:area, goove type, profile, source, glues, fibers 1mm round Kurray NICADD scintillator 0.8 mm square Bicron Can tune light yield with fiber type. Jerry Blazey NIU/NICADD

  23. NICADD Extruder @ Fermilab Jerry Blazey NIU/NICADD

  24. 3mm 4mm 5 mm Thickness Tolerance: 2-3%Response Depends weakly on Thickness: ~20%/mm Thickness not an issue Jerry Blazey NIU/NICADD

  25. Optimum Cell • Hexagonal or Square • 4 - 9 cm2 • Straight Groove • High efficiency fiber • Glued Fiber and Painted Surface • Extruded (cut costs) @ 5mm But a bigger question is the light sensor: PMTs costly, bulky we have been investigating APDs, MRS, Si-PM… My current guess… Jerry Blazey NIU/NICADD

  26. Hamamatsu Avalanche Photo-Diodes Jerry Blazey NIU/NICADD

  27. Cosmic MIP with Avalanche Photo-Diode Hamamatsu S8550 Jerry Blazey NIU/NICADD

  28. MetallicResistiveSensors Jerry Blazey NIU/NICADD

  29. Cosmics with MRS Jerry Blazey NIU/NICADD

  30. Si-PM’s (mounted on cell?) Jerry Blazey NIU/NICADD

  31. Cosmic Data with Si-PM Number of P.E. Comparable to PMT Jerry Blazey NIU/NICADD

  32. Tabulated Studies/Specs * B. Dolgoshein An Advanced Study of Silicon PM ICFA IB 2002 **A. Bross et all. Fermilab FN 0733 2003 *** Rykalin V. NICADD presentation http://nicadd.niu.edu 2002 Believe <$10/unit in bulk for SiPM Jerry Blazey NIU/NICADD

  33. Scintillator DHC Conclusions • Simulations indicate approach competitive with analog approach • Prototypes indicate there is sufficient sensitivity (light x efficiency) & uniformity. • Now optimizing materials & construction to minimize cost with required sensitivity • SiPM and MRS look very promising All-in-all looks like a very competitive option…. We’ll be moving towards the next prototype Jerry Blazey NIU/NICADD

More Related