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Calorimetry Cornell-ALCPG

Calorimetry Cornell-ALCPG. Calorimetry Detector Study Plans at Colorado Uriel Nauenberg for The Colorado Group The Cornell ALCPG Meeting July , 2003. Calorimetry Purpose.

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Calorimetry Cornell-ALCPG

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  1. Calorimetry Cornell-ALCPG • Calorimetry Detector Study • Plans at Colorado • Uriel Nauenberg • for • The Colorado Group • The Cornell ALCPG Meeting • July , 2003

  2. Calorimetry Purpose • What Drives the Calorimetry Quality in SUSY •  In the measurement of 2nd Chargino and • Heavy Neutralinos we need to measure • low energy edge of the Z and higgs. •  Need excellent energy resolution for the g. Hence excellent em energy resolution.

  3. SUSY 2nd Chargino + - • l l combined mass

  4. SUSY 2nd Chargino 0 • Z Energy • Mass Cut ZCorrect Z Z h

  5. Scintillator Geometry x-y view z view

  6. Fiber Placement Light Correction Light Correction

  7. Photon Shower • Energy Leakage • 30 Layers 35 Layers

  8. Photon Shower • Energy Leakage • 40 Layers 45 Layers

  9. Photon Shower • Variations in Energy leakage • 30 Layers 45 layers

  10. Calorimeter Simulation Calorimeter Energy Resolution 2 mm scint., 1.75 mm W, 1 mm space 35 Layers 30 Layers

  11. Calorimeter Simulation Calorimeter Energy Resolution 2 mm scint., 1.75 mm W, 1 mm space 45Layers 40 Layers

  12. Calorimeter Simulation Calorimeter Energy Resolution 1.75 mm W, 1 mm space 2 mm scint. 1mm scint. 45 LAYERS

  13. Photon Showers • Photon Shower Radii 5 GeV 15 GeV

  14. Photon Shower • Photon Shower Radii 50 GeV 75 GeV

  15. Photon Shower Radius

  16. Photon Showers • Method of Obtaining Space Point • Generate Showers with GEANT 4.0 • Calculate Position =  x E i i   E i

  17. Photon Showers • Reconstruction of Position from Energy Sharing

  18. Photon Shower • Position Resolution when Tiles are Offset

  19. Photon Showers • Tiles not offset Tiles offset • About 1.5 cm from edge

  20. Photon Showers • Spatial Resolution Near Center of Tile • Tiles not offset Tiles offset

  21. Photon Shower • Position Resolution Using Forty Layers 5 cm tiles

  22. Photon Showers • Resolution in the track slope near center of tile • Tiles Not Offset Tiles Offset

  23. Photon Shower • Tile Areas of Simulation

  24. Photon Showers   Resolution 40 layers total 3 layers read together 5 layers read together

  25. Particle Separation • Standard Model SUSY

  26. Particle Separation • Betweeen s Betweeen  and • Charged Particles

  27. Calorimeter-ALCPG 2 • We have built a cosmic ray telescope 15x15 cm • Plan to use  1.3 GeV Muons • Plan to Study • Light Collection Efficiency for a straight fiber • versus a curved fiber using Tyvek and using • 3M Super Reflector as a function of the distance • from the fiber.

  28. Calorimeter-ALCPG • Plan to Study • Fiber Readout with Avalanche PhotoDiodes; • study voltage stability, temperature stability; • light loss versus fiber length. • Study uniformity of response of various • photodiodes.

  29. Calorimeter-ALCPG • Cosmic Ray rate observed in Boulder is  2 • per cm per minute which is twice the expected rate at sea level. • We are building a calorimeter module to study the content of the cosmic rays at Boulder’s altitude while testing our concept of spatial resolution and while waiting for beam availability. 2

  30. Calorimeter Test Stand

  31. Calorimeter Test Stand • 5 cm scintillator pieces with fiber

  32. Calorimeter Test Stand • 5 cm scintillator pieces with fibers epoxied

  33. Calorimeter Test Stand • Computer Readout •  Camac crate and ADC from SLAC •  Investigating getting Crate Controller • PCI card interface from Fermilab or • purchase from Kinetic Systems.

  34. Calorimeter Test Stand • Planned Measurements •  We get ~ 30 cts /h in 5x5 mm •  Measure light collection uniformity • across 5x5 cm scintillator piece for • the 2 kinds of fiber insert geometry. 2

  35. Calorimeter Design • Good Resolution (11%/E) • Needs 45 layers • 770 K 5x5 cm pieces • Needs to be Optimized • with SIMULATION • 7 x 7 cm may be O.K. 2 2

  36. Calorimeter Pieces Measurements • Measured 13 ordered pieces • x = 50.007  0.020 mm • y = 49.984  0.039 mm • excellent size uniformity

  37. Calorimeter R&D • Going to work with a company to • determine whether we can melt • scintillator grooves with wire currents. • We did this very well with lead plates • and thin aluminum sheets. • Then imprint thin grooves 5 cm apart

  38. Calorimeter Test Stand • Avalanche Photodiodes •  Characterize Pulse Height Stability • vs •  Voltage •  Temperature •  Rate •  Uniformity, Linearity, etc.

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