NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-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-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-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-ALCPG The Calorimeter   Scintillator tile layers 5 x 5 cm 2, 2mm thick.  Alternate layers are offset. See next slide.  Effective 2.5 x 2.5 cm 2 spatial resolution.  Reduces by 25 the number of channels when compared to 1 cm 2 tile structures.

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG The Basic Geometrical Structure

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG The Tile Arrangement

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG The Calorimeter test unit we have built Cosmic Ray Trigger

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 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.

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG Test Calorimeter in Box Test Pulse Digitized LabView

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG Labview Pulse Height Analyzer for a Pulser

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG 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 cm 2 versus 1 cm 2 tile structures. Issues on Spatial Resolution

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-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-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-ALCPG Spatial Resolution 1 dimension(z) 

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG Mass of the Z 0  e e No Offset Offset

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG Directional Biases in the Shower Fit red = 0 0 dip angle blue = 45 0 dip angle

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG After 1 st order Corrections

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG  direction Understanding the Fit Bias fitted direction

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG Z0 Mass Fit after Bias Correction no offset offset

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG Photon Energy Spectra from Reactions at 1 TeV

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG Low Energy End of the Photon Energy Spectrum from Reactions at 1 TeV

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG 100 GeV Shower Deposition Resolution No Conditions 2% of shower in few layers

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG 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-ALCPG

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG Distance Between Particles at Calorimeter

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 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.

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG Issues in Resolution  Dynamic Range 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-ALCPG We need to study the resolution effectiveness via simulation. Need to understand our present resolution. 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 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.We need to study how to construct these in a simple manner to maintain cost effectiveness while maintaining accuracy. What Needs to be Studied

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 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.

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 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.

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG A LOT OF WORK IN NEAR FUTURE

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG

NLC – The Next Linear Collider Project Colorado Univ. – Boulder, Jan., 2004 LCD-ALCPG