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pad design present understanding

Tel Aviv University HEP Experimental Group. Ronen Ingbir. C ollaboration. FCAL. High precision design. LumiCal. pad design present understanding. Tel-Aviv Sep.05. 1. C ollaboration. FCAL. High precision design. Outline.

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pad design present understanding

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  1. Tel Aviv University HEP Experimental Group Ronen Ingbir Collaboration FCAL High precision design LumiCal pad design present understanding Tel-Aviv Sep.05 1

  2. Collaboration FCAL High precision design Outline High statistics MC, Fast simulation • Design optimization (GEANT) : • Granularity and reconstruction algorithm (Log. Weighting). • Electronics channels (Maximum peak shower design). Present understanding design (head on ILC, Crossing angle). Method of counting Bhabha events Summary Tel-Aviv Sep.05 2

  3. Collaboration FCAL High precision design Fast Detector Simulation Motivation : High statistics is required to notice precision of : (Which is the precision goal of the ILC) There is an analytic calculation (and approximation) : Luminosity precision determination : N1 : Reconstructed and generated in acceptance region. N2 : Generated in acceptance region but reconstructed outside. N3 : Generated outside acceptance region but reconstructed inside. Tel-Aviv Sep.05 3

  4. Collaboration FCAL High precision design High Statistics Simulation Changing the bias with a fixed resolution. BHWIDE generated properties + smearing to simulate detector Tel-Aviv Sep.05 4

  5. Collaboration FCAL High precision design High Statistics Simulation Changing the detector resolution with no bias Tel-Aviv Sep.05 5

  6. Collaboration FCAL High precision design Data and MC In real life we can include the detector performance (which is measured in test beam) into MC. The only question is: How well should we know the detector performance ? Tel-Aviv Sep.05 6

  7. Collaboration FCAL High precision design Logarithmic Weighting Tel-Aviv Sep.05 7

  8. Collaboration FCAL High precision design Granularity in theta, GEANT results Resolution Bias Tel-Aviv Sep.05 8

  9. 4 rings 15 rings 11 rings 30 rings 15 cylinders 10 cylinders 20 cylinders 10cylinders 24 sectors * 15 rings * (10 cylinders + 20 cylinders) = 10,800 channels Collaboration FCAL High precision design Maximum Peak Shower Design Our basic detector is designed with 30 rings * 24 sectors * 15 cylinders = 10,800 channels Do we use these channels in the most effective way ? Tel-Aviv Sep.05 9

  10. Polar Reconstruction 0.13e-3 rad 0.11e-3 rad Collaboration FCAL High precision design Maximum peak shower design Basic Design Angular resolution improvement without changing the number of channels Other properties remain the same Tel-Aviv Sep.05 10

  11. 10 cylinders (θ) 60 cylinders (θ) Cylinders (mrad) 14 Collaboration FCAL High precision design Present Understanding (pad option) Based on optimizing theta measurement 11 layers (z) 15 layers (z) 4 layers (z) Tel-Aviv Sep.05 11

  12. Collaboration FCAL High precision design X- angle background Beamstrahlung pair background Christian Grah, DESY-Zuethen 250 GeV Tel-Aviv Sep.05 12

  13. Collaboration FCAL High precision design Method of counting events Maximum peak shower design and logarithmic weighting : working with a constant (Beam energy and cells size dependents) + applying differential weighting between the parts. Applying tight acceptance cut on one detector arm. Applying a looser acceptance cut on the second detector arm. Count events which satisfy the back to back requirement using a band cut. Repeat method for the other side of the detector and compare results. Tel-Aviv Sep.05 13

  14. Out In Eout-Ein P= Eout+Ein Collaboration FCAL High precision design Tight cut 3 cylinders 2 cylinders 1 cylinders Tel-Aviv Sep.05 14

  15. Simulation distribution Distribution after acceptance and energy balance selection Collaboration FCAL High precision design Forward-Backward Balance R L Left side PH Right PH - Left PH Right side PH Tel-Aviv Sep.05 15

  16. With this performance the Collaboration FCAL High precision design Performance of present configuration goal can be reached. Tel-Aviv Sep.05 16

  17. Collaboration FCAL High precision design Next (and immediate) steps Taking the present understanding design as a basis design for future simulation. Understanding the criteria for identifying and selecting Bhabha event (maybe better detector resolutions are necessary). Testing the crossing angle recommendation design in a crossing angle Bhabha scattering simulation which includes serpentine magnetic field. Tel-Aviv Sep.05 17

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