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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimetry Cornell-ALCPG Calorimetry Detector Study Plans at Colorado Uriel Nauenberg for The Colorado Group The Cornell ALCPG Meeting July, 2003

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimetry Purpose What Drives the Calorimetry Quality in SUSY In the measurement of 2 nd Chargino and Heavy Neutralinos we need to measure low energy edge of the Z and higgs. Need excellent energy resolution for the ence excellent em energy resolution.

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder SUSY 2nd Chargino l l combined mass + -

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder SUSY 2nd Chargino Z Energy Mass Cut Z Correct Z 0 Z h

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Scintillator Geometry x-y view z view

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Fiber Placement Light Correction

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Shower Energy Leakage 30 Layers 35 Layers

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Shower Energy Leakage 40 Layers 45 Layers

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Shower Variations in Energy leakage 30 Layers 45 layers

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimeter Simulation Calorimeter Energy Resolution 2 mm scint., 1.75 mm W, 1 mm space 30 Layers 35 Layers

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimeter Simulation Calorimeter Energy Resolution 2 mm scint., 1.75 mm W, 1 mm space 40 Layers 45Layers

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimeter Simulation Calorimeter Energy Resolution 1.75 mm W, 1 mm space 1mm scint. 2 mm scint. 45 LAYERS

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Showers Photon Shower Radii 5 GeV 15 GeV

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Shower Photon Shower Radii 50 GeV 75 GeV

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Shower Radius

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Showers Method of Obtaining Space Point Generate Showers with GEANT 4.0 Calculate Position = x E E i i i

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Showers Reconstruction of Position from Energy Sharing

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Shower Position Resolution when Tiles are Offset

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Showers Tiles not offset Tiles offset About 1.5 cm from edge

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Showers Spatial Resolution Near Center of Tile Tiles not offset Tiles offset

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Shower Position Resolution Using Forty Layers 5 cm tiles

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Showers Resolution in the track slope near center of tile Tiles Not Offset Tiles Offset

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Shower Tile Areas of Simulation

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Photon Showers Resolution 3 layers read together 5 layers read together 40 layers total

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Particle Separation Standard Model SUSY

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Particle Separation Betweeen s Betweeen and Charged Particles

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimeter-ALCPG 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. 2

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder 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.

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder 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

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimeter Test Stand

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimeter Test Stand 5 cm scintillator pieces with fiber

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimeter Test Stand 5 cm scintillator pieces with fibers epoxied

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder 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.

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder 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

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder 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

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimeter Pieces Measurements Measured 13 ordered pieces x = 50.007 0.020 mm y = 49.984 0.039 mm excellent size uniformity

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder 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

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder Calorimeter Test Stand Avalanche Photodiodes Characterize Pulse Height Stability vs Voltage Temperature Rate Uniformity, Linearity, etc.

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder

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NLC – The Next Linear Collider Project Colorado Univ. - Boulder

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