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Calorimetry Advances in SUSY Research: Energy Resolution and Shower Simulation Studies

This presentation outlines the latest developments in calorimetry for studying supersymmetric (SUSY) particles, focusing on the measurement of second chargino and heavy neutralinos. We emphasize the importance of energy resolution in accurately detecting low-energy edges of Z and Higgs bosons. Key methodologies, including shower simulations using GEANT 4.0, fiber readout using Avalanche Photodiodes, and cosmic ray analysis are discussed. The work aims to optimize calorimeter design for excellent light collection efficiency and uniform response across various configurations.

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Calorimetry Advances in SUSY Research: Energy Resolution and Shower Simulation Studies

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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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