nlc – the next linear collider project colorado univ. - boulder calorimetry-arlington calorimetry...

NLC – The Next Linear Collider Project

Colorado Univ. - Boulder

Calorimetry-Arlington

Calorimetry Detector Study

Plans at Colorado

Uriel Nauenberg

for

The Colorado Group

The ALCPG Meeting

May 12, 2003



Scintillator Geometry

x-y view z view



Fiber Placement

Light Correction

Light Correction



Photon Shower

Energy Leakage

30 Layers 35 Layers



Photon Shower

Energy Leakage

40 Layers 45 Layers



Photon Shower

Variations in Energy leakage

30 Layers 45 layers



Calorimeter Simulation

Calorimeter Energy Resolution2 mm scint., 1.75 mm W, 1 mm space

30 Layers 35 Layers




Calorimeter Energy Resolution2 mm scint., 1.75 mm W, 1 mm space

40 Layers 45Layers




Calorimeter Energy Resolution1.75 mm W, 1 mm space

1mm scint. 2 mm scint.45 LAYERS



Photon Showers

Photon Shower Radii 5 GeV 15 GeV



Photon Shower

Photon Shower Radii 50 GeV 75 GeV



Photon Shower Radius



Photon Showers

Method of Obtaining Space Point

Generate Showers with GEANT 4.0

Calculate Position =

x E Ei i

i



Photon Showers

Reconstruction of Position from Energy Sharing



Photon Shower

Position Resolution when Tiles are Offset



Photon Showers

Tiles not offset Tiles offset

About 1.5 cm from edge



Photon Showers

Spatial Resolution Near Center of Tile

Tiles not offset Tiles offset



Photon Shower

Position Resolution Using Forty Layers

5 cm tiles



Photon Showers

Resolution in the track slope near center of tile

Tiles Not Offset Tiles Offset



Photon Shower

Tile Areas of Simulation



Photon Showers

Resolution

3 layers read together 5 layers read together40 layers total



Calorimeter-ALCPG

We have built a cosmic ray telescope7.6x7.6 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



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 variousphotodiodes.



Calorimeter-ALCPG

Cosmic Ray rate observed in Boulder is 2

per cm per minute which is twice the expected rate at sea level.

We would like to build 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



Calorimeter Test Stand

nlc – the next linear collider project colorado univ. - boulder calorimetry-arlington calorimetry...

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