NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
Presentation at the ALCPG-SLAC
Meeting
Progress Report of Work at Colorado
January, 2004
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
THE GROUP
Shirley Choi, Bradford Dobos, Tyler Dorland, Eric Erdos,
Jeremiah Goodson, Jack Gill, Jason Gray
Andrew Hahn, Eric Kuhn, Alfonso Martinez
Kyle Miller, Uriel Nauenberg, Joseph Proulx,
Jesse Smock
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
ACTIVITIES
Develop a new geometrical structure in calorimetry that is cost effective and will have the energy and time resolution required in a Linear Collider environment.
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
The Calorimeter Scintillator tile layers 5 x 5 cm2, 2mm thick. Alternate layers are offset. See next slide. Effective 2.5 x 2.5 cm2 spatial resolution. Reduces by 25 the number of channels when
compared to 1 cm2 tile structures.
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
The Basic Geometrical Structure
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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The Tile Arrangement
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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The Calorimeter test unit we have built Cosmic Ray Trigger
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
New Readout Equipment We have LabView Installed. University money. We have purchased readout from National Instruments. We are calibrating the ADCs. Learning the power of LabView. We already know we have problems with calorimeter; low pulse height
from cosmic muons. It is time to have fun investigating. A lot of work in the near future.
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
Test Calorimeter in Box Test Pulse Digitized LabView
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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Labview Pulse Height Analyzer for a Pulser
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
Moliere RadiusComparison of Photons Spatial Resolution
with no offset case Resultant Spatial Resolution Comparison Net Mass and Jet Directional Resolution Can we Separate Hadrons from the Shower Energy Flow Resolution of 2.5 x 2.5 cm2
versus 1 cm2 tile structures.
Issues on Spatial Resolution
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
Standard Dev. of the Shower Energy Distribution
5 Gev Photon 75 GeV Photon Shower of Dist. vs P
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
Moliere Radius
The Moliere Radius is defines as containing 90% of the
Energy. This is roughly equivalent to 1.63 x = 1.63 x 1.5
Moliere Radius = 2.5 cm.
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
Spatial Resolution 1 dimension(z)
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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Mass of the Z0 e e No Offset Offset
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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Directional Biases in the Shower Fit red = 00 dip angle blue = 450 dip angle
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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After 1st order Corrections
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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direction
Understanding the Fit Bias
fitted direction
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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Z0 Mass Fit after Bias Correction no offset offset
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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Photon Energy Spectra from Reactions at 1 TeV
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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Low Energy End of the Photon Energy Spectrum from Reactions
at 1 TeV
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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100 GeV Shower Deposition Resolution
No Conditions 2% of shower in few layers
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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More on Resolution
Some evidence that resolution deteriorates as dip angle
increases. Being investigated.
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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Distance Between Particles at Calorimeter
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
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What have we learned so far
Loosing light from curved (2.5 cm. radius) fibers. Our colleagues from Italy have indicated fibers need to be annealed. We have an oven. Will study this problem next.
We can gang 3 or 5 layers together without much loss in resolution. We need to study this more carefully for 1-2 GeV photons.
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
Issues in Resolution
Dynamic Range 0.5-250 GeV. Can we achieve
good energy resolution over this spectrum in the electromagnetic calorimeter device. Number of readout bits needed.
Can we achieve good spatial directional resolution in the low energy end of the spectrum.
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
• We need to study the resolution effectiveness via We need to study the resolution effectiveness via simulation. Need to understand our present simulation. Need to understand our present resolution.resolution.
• We need to study the light collection efficiency, We need to study the light collection efficiency, uniformity. This will be done with cosmic rays. uniformity. This will be done with cosmic rays. Tyvek versus Radiant Mirror paper. Tyvek versus Radiant Mirror paper.
• We need to study how to construct these in a simple We need to study how to construct these in a simple manner to maintain cost effectiveness while manner to maintain cost effectiveness while maintaining accuracy. maintaining accuracy.
What Needs to be StudiedWhat Needs to be Studied
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
Continue, What Needs to be Studied• We need to develop Extruded Scintillator techniques
with the Fermilab folks to determine whether we can maintain thickness dimensions to within a fraction of a mm.
• Can we inscribe grooves 5 cm apart in Extruded Scintillator and can we maintain lateral dimensions to a mm.
• We need to develop Pattern Recognition and Energy Flow algorithms that use our different geometrical arrangement. We are now starting this effort.
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
Continue, What Needs to be Studied
• We need to compare our algorithms with those of the silicon based study to determine cost benefit alternatives.
• Study electronics readout; APDs, HPDs,VLPCs. We have started a collaboration with Fermilab’s electronics group.
• This requires cryogenic techniques we do not have. Are investigating collaborative arrangements with Fermilab to provide cryogenics help.
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
A LOT OF WORK IN NEAR FUTURE
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG
NLC – The Next Linear Collider Project
Colorado Univ. – Boulder, Jan., 2004
LCD-ALCPGLCD-ALCPG