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Energy Flow Alrogithm Development for a Digital Hadron Calorimeter Using GEM

Venkat, TSAPS Meet Oct 10 - 12, 2002. Energy Flow Alrogithm Development for a Digital Hadron Calorimeter Using GEM. Venkatesh Kaushik* University of Texas at Arlington Motivation Digital Hadron Calorimetry Why GEM ? Energy Flow Analysis UTA GEM, DHCal Study Plans for the Future

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Energy Flow Alrogithm Development for a Digital Hadron Calorimeter Using GEM

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  1. Venkat, TSAPS Meet Oct 10 - 12, 2002 Energy Flow Alrogithm Development for a Digital Hadron Calorimeter Using GEM Venkatesh Kaushik* University of Texas at Arlington Motivation Digital Hadron Calorimetry Why GEM ? Energy Flow Analysis UTA GEM, DHCal Study Plans for the Future Conclusion *On behalf of the HEP Group at UTA

  2. Venkat, TSAPS Meet Oct 10 - 12, 2002 Motivation • New techniques are needed to achieve physics goals at future accelerators, such as the Next Linear Collider (NLC) • Limitations of traditional sampling calorimetry • Need for efficient tracking and jet energy resolution • Digital calorimetry with efficient tracking is the future ? • Physics motivation for Higgs characteristics

  3. Small cell size for good multiple track shower separation High efficiency for MIP’s in a cell for effective shower particle counting Possibility for multiple thresholds Dense and compact design for quick shower development to minimize confusion Large tracking radius with optimized magnetic field for sufficient separation between tracks for shower isolation Venkat, TSAPS Meet Oct 10 - 12, 2002 Digital Hadron Calorimetry

  4. Venkat, TSAPS Meet Oct 10 - 12, 2002 Why GEM? • Allow flexible and geometrical design, using printed circuit readout • High gains, > 104, with spark probabilities per incident  less than 10-10 • Fast response • 40ns drift time for 3mm gap with ArCO2 • Relative low HV • A few 100 volts per each GEM gap compared to 10-16kV for RPC • Reasonable cost • Foils are basically copper-clad kapton

  5. Venkat, TSAPS Meet Oct 10 - 12, 2002 WHY .. Another Algorithm ?

  6. Venkat, TSAPS Meet Oct 10 - 12, 2002 The Need… • Many interesting events have 2 or more ( as many as 10 !!) jets in the final state • Require better than 40%/E for meaningful Higgs self-coupling measurement • Good clustering technique needed to resolve showers which possibly overlap in complex events • Hadronic showers tend to be more broad and unconnected -- tough to handle. • Pattern recognition is crucial to associate energy deposited in the calorimeter cells with particles

  7. Venkat, TSAPS Meet Oct 10 - 12, 2002 Typical Composition of Jets

  8. Only part susceptible to shower statistical fluctuations Venkat, TSAPS Meet Oct 10 - 12, 2002 Energy Flow Algorithm Normal Calorimetric Method C1 C2 C3 C4 C6 C5 Energy Flow Method C7 p3 p2 p5 p7

  9. Venkat, TSAPS Meet Oct 10 - 12, 2002 e+e- hZ bbjj Event

  10. 2 Clusters Venkat, TSAPS Meet Oct 10 - 12, 2002 Resolving Power • Essential to resolve and associate clusters with charged particles for effective removal and replacement of the cluster energies • Finer segmentation provides higher resolving power • Tracking for muons • Look for late decays

  11. Venkat, TSAPS Meet Oct 10 - 12, 2002 Jet Energy Resolution 60%/E 30%/E Courtesy: H.Videau Using EFA

  12. Venkat, TSAPS Meet Oct 10 - 12, 2002 UTA DHCal and GEM studies • GEM Detector Prototype built • Test chamber box • Readout circuit board (1cmx1cm pads) being redesigned • HV layout design complete Courtesy: J.Li

  13. Venkat, TSAPS Meet Oct 10 - 12, 2002 UTA DHCal and GEM Studies Existing Geometry of DHCal • 8 staves each having 5 modules • Each module has 40 layers, each layer with plates of 18 mm of Fe and 6.5 mm of polystyrene scintillator • Hcal hits are collected Polystyrene scintillator, in cells of ~1 cm2 • Hcal end-caps are build as 32 side Polyhedrons, with 40 layers inside, each layer with plates of 18 mm of Fe and 6.5 mm of Polystyrene scintillator Courtesy: Paulo deFrietas

  14. Venkat, TSAPS Meet Oct 10 - 12, 2002 UTA DHCal and GEM Studies • TDR / Hcal02 Model chosen for modification • Fe-GEM sub-detector instead of the existing Fe-Scintillator • New driver for the HCal02 sub- detector module • Local database connectivity for HCal02 Courtesy: Paulo deFrietas

  15. Venkat, TSAPS Meet Oct 10 - 12, 2002 Plans for the Future • Construct thicker prototype for beam exposure if the studies turn out feasible • Work on understanding discharge probability of GEM • Perform Clustering Algorithm Study • Perform Tracking Algorithm Study • Work on GEM geometry implementation for design optimization

  16. Venkat, TSAPS Meet Oct 10 - 12, 2002 Conclusion • Future physics goals demands higher jet energy resolution calorimetry • Energy Flow method supplemented with digital calorimetry is a viable solution • A good project for strategic preparation of the future of the group • The software (MC and tracking algorithm) will be beneficial to other future projects • This first year will provide a firm foundation for further studies to develop the DHCal technology • LC calorimeter group is very supportive on this initiative • We believe this study will be fruitful in the future

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