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LCD-ALCPG

LCD-ALCPG. Presentation at the ALCPG-SLAC Meeting Progress Report of Work at Colorado January, 2004. LCD-ALCPG. THE GROUP Shirley Choi, Bradford Dobos, Tyler Dorland, Eric Erdos, Jeremiah Goodson, Jack Gill, Jason Gray

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LCD-ALCPG

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  1. LCD-ALCPG • Presentation at the ALCPG-SLAC • Meeting • Progress Report of Work at Colorado • January, 2004

  2. LCD-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

  3. LCD-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.

  4. LCD-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.

  5. LCD-ALCPG • The Basic Geometrical Structure

  6. LCD-ALCPG • The Tile Arrangement

  7. LCD-ALCPG • The Calorimeter test unit we have built • Cosmic Ray Trigger

  8. LCD-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.

  9. LCD-ALCPG • Test Calorimeter in BoxTestPulse Digitized LabView

  10. LCD-ALCPG • Labview Pulse Height Analyzer for a Pulser

  11. LCD-ALCPG Issues on Spatial Resolution • Moliere Radius • Comparison 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.

  12. LCD-ALCPG • Standard Dev. of the Shower Energy Distribution • 5 Gev Photon 75 GeV Photon Shower  of Dist. vs P

  13. LCD-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.

  14. LCD-ALCPG • Spatial Resolution 1 dimension(z) d()()

  15. LCD-ALCPG • Mass of the Z0 e e • No Offset Offset

  16. LCD-ALCPG • Directional Biases in the Shower Fit • red = 00 dip angleblue = 450 dip angle

  17. LCD-ALCPG • After 1st order Corrections

  18. LCD-ALCPG Understanding the Fit Bias fitted direction g direction

  19. LCD-ALCPG • Z0 Mass Fit after Bias Correction no offset offset

  20. LCD-ALCPG • Photon Energy Spectra from Reactions at 1 TeV

  21. LCD-ALCPG • Low Energy End of the Photon Energy Spectrum from Reactions • at 1 TeV

  22. LCD-ALCPG • 100 GeV Shower Deposition Resolution • No Conditions 2% of shower in few layers

  23. LCD-ALCPG • More on Resolution • Some evidence that resolution deteriorates as dip angle • increases. Being investigated.

  24. LCD-ALCPG

  25. LCD-ALCPG • Distance Between Particles at Calorimeter

  26. LCD-ALCPG • 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.

  27. LCD-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.

  28. LCD-ALCPG What Needs to be Studied • We need to study the resolution effectiveness via simulation. Need to understand our present resolution. • We need to study the light collection efficiency, uniformity. This will be done with cosmic rays. Tyvek versus Radiant Mirror paper. • We need to study how to construct these in a simple manner to maintain cost effectiveness while maintaining accuracy.

  29. LCD-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.

  30. LCD-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.

  31. LCD-ALCPG • A LOT OF WORK IN NEAR FUTURE

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