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Calorimetry R&D for Linear Collider Detector: The Road Ahead

This document discusses the goals, current progress, and future plans for calorimeter research and development at NICADD. Topics include scintillator-based calorimeters, simulations, algorithms, light yield, tile-fiber system, photo-detectors, and future steps.

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Calorimetry R&D for Linear Collider Detector: The Road Ahead

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  1. Calorimetry@NICADD.next2yrs Vishnu V. Zutshi For the NICADD team

  2. Introduction • The goal • Where we are • The road ahead • Sincere thanks to NICADD personnel for providing advice and input for this • My personal opinions to start the discussions NICADD Retreat

  3. The Goal • Take a leadership role in calorimeter R&D for the Linear Collider Detector • Focus on scintillator-based (semi)digital hadron calorimeter • Develop simulations and algorithms to fully exploit the power of the proposed calorimeters (Dhiman’s talk) NICADD Retreat

  4. Linear Collider Detector ECAL and HCAL inside coil NICADD Retreat

  5. Single Particle Resolutions NICADD Retreat

  6. Where We Are • Light yield • Tile-fiber system optimization • Layer stack • Photo-detectors NICADD Retreat

  7. MIP Light Yield 9.4 cm2 cells with sigma grooves, 0.94 mm fiber, readout w/ 16-channel PMT. Avg. MIP LY = 11 p.e. Very sensitive function of tile-fiber specifics. NICADD Retreat

  8. Tile-Fiber Studies NICADD Retreat

  9. In Progress NICADD Retreat

  10. Within 15% desired Light Yield Dispersion NICADD Retreat

  11. Layer Stack NICADD Retreat

  12. Reading out the Layer Stack 4 layers being read out NICADD Retreat

  13. Layer Stack Next Steps • Understand the response of the 4 layers currently being readout • Readout all 84 channels with pmt’s • Gradually replace some layers with solid-state photo-detectors like Si-PM’s, APD or MRS • May need to replace the cells NICADD Retreat

  14. Avalanche Photo Diodes 32 channel Hamamatsu matrix. 80% QE, gains in the low 100’s. NICADD Retreat

  15. APD Gain Studies NICADD Retreat

  16. APD Next Steps • Wrap up gain measurements (both APD’s) • Fabricate APD box • Cross calibrate with PMT • Alternate test-stand • Try to obtain mip signal for a single channel • Multi-channel readout • Study temperature dependence NICADD Retreat

  17. Silicon PhotoMultiplier (SiPM) MEPhI&PULSAR SiPM Pixels of the SiPM ~1K pixels on 1mm2 Si-PM’s NICADD Retreat

  18. Preliminary Results with Si-PM’s MRS devices expected end of the month NICADD Retreat

  19. Manpower + LC Muon + MUCOOL + D0 • Tile-Fiber System: Sasha, Peter (leaving soon) • Layer Stack: Kurt*, Donna* • APD: Dimitri* • Si-PM: Victor • Electronics: Manuel, Victor • Electrical and Mechanical Shops + Extruder Intends to teach * Doing coursework NICADD Retreat

  20. Funding Requests 10K “planning” grant awarded NICADD Retreat

  21. The Road Ahead • Test Beam • Collaboration • Tail-Catcher • Electronics • Additional funding • Papers NICADD Retreat

  22. Test Beam • Fully test the detection and readout chains • Gain experience with • Detailed verification of GEANT4 • Testing Eflow algorithms • Low to moderate E pions (1-20 GeV) • Place: Fermi? Protvino? ? • 1m x 1m x 1m prototype needed NICADD Retreat

  23. Collaboration with DESY? • The “other” scintillator option • 1m3 prototype late 04 to early 05 • Should we seek partnership with them? • In my opinion we do not have much choice if we want to go beyond the layer stack the lack of a technology alternative cost of fully instrumented 1m3 prototype NICADD Retreat

  24. Projected Funding Profile NICADD Retreat

  25. Testbeam Layout NICADD Retreat

  26. s/E measured w.r.t. full 9cm2 grid Test Beam Simulation NICADD Retreat

  27. Overlaps muon R&D Tail-Catcher • Also functions as a muon system • 5% of the tracks deposit energy outside the calorimeters • Prob./event > 20GeV (in tail-catcher)~4% • For the test-beam however, it is an exclusive piece of apparatus • Do we want to build this and how? NICADD Retreat

  28. Tail-Catcher for the Testbeam • 2-3 l thick, 1.5 x 1.5 m2 • Iron/Steel as absorber • Extruded strips (X-Y ?) • 4-5 layers • PMT or Si-PM readout • Do we want to make it such that it also serves as a muon-prototype? ~10 cm thick Fe WLS 5mm thick scint.? NICADD Retreat

  29. Electronics • Development of semi-digital readout electronics • Must smoothly interface into the CALICE test beam DAQ NICADD Retreat

  30. A Possible Course of Action • Take part in CALICE testbeam • Instrument 15-20 layers of 3x3 grid (1500-2000 cells: $12-15K) • Take responsibility for the tail-catcher (major infrastructure cost is iron ~ 0-10K + 2-5K for photodetectors + labor + transportation  ask DESY or Fermilab) • Design and fabricate semi-digital electronics NICADD Retreat

  31. DOE Funding? • Possibility exists of getting DOE support for LC related calorimeter R&D • Cannot ask money for the same things eventhough the money being earmarked for them is not enough • Possible projects: Instrumentation and/or electronics for n layers tail-catcher NICADD Retreat

  32. Papers • IEEE Transactions (November): mostly on tile-fiber system optimization + some motivation from simulation • NIM (early 2004): hardware and simulation paper establishing the feasibility of a scintillator-based (semi)digital hcal • Test-beam related articles (late 2004): NICADD Retreat

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