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DAQMB/FEBs Readiness for First Beam

Why is CSC Resolution Insensitive to Cross Talk? S. Durkin Nov. 10, 2009 A Theoretical Gatti Calculation using Maple. DAQMB/FEBs Readiness for First Beam. Jianui Gu The Ohio State University. Review. How to handle crosstalk in reconstruction?.

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DAQMB/FEBs Readiness for First Beam

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  1. Why is CSC Resolution Insensitive to Cross Talk? S. Durkin Nov. 10, 2009 A Theoretical Gatti Calculation using Maple DAQMB/FEBs Readiness for First Beam Jianui Gu The Ohio State University

  2. Review How to handle crosstalk in reconstruction? Cross talk (blue) extracted from the data. Cross talk (red) was measured by fitting the Gatti distribution to test beam muon data. Notice the offset of about 3% Convolution for pulsed strip (black) and adjacent strip (blue) for a given layer in a ME2/2 chamber. The red curve is a fit to the peak. Reference: Determining the CSC Cross Talk using the Buckeye External Pulser.S. Durkin, J. Gilmore, F. Geurts April 26, 2005

  3. Yes, the Cross Talk is Treated Correctly Time Bin Peak-1 Time Bin Peak Time Bin Peak+1 Q/(QL+QC+QR) Hit Position (Strips) Correct Cross Talk Correct Cross Talk Gatti Formula Cut on strip width: 0.85 to 0.95 cm

  4. A Theoretical Gatti Calculation using Maple Gatti Induced Charge Formula ME3/2:r=h/w h=0.476 w=0.9 Step 1: Generate Charges on Strips as function of strip peak charge position x L-left M-middle R-right

  5. Calculate Cross Talk Smearing Step 2: Apply Cross talk in three time bins Bin 1 Bin 2 Bin 3 unsmeared Assumed same for all strips x(strips)

  6. Time Bin Charge Addition Weighting Step 3: Add three time bins properly weighed as a function of time Pulse Charge as function of time (5 pole semigaussian) Raw Q CrossTalk XQ x(strips)

  7. The Answer Step 4: Calculate ratios used in RecHitD look-up table No Cross Talk: With Cross Talk: x(strips) RX R R-RX Maximum Difference 50 m x(strips)

  8. Qualitative Understanding The Look-up Table Ratio (QR-QL)/(QM-QL) is Purposely Insensitive to Cross Talk: Center of Strip (x=0) Between Strips (x=0.5) QL QM QR QL QM QR QM=QR QR=QL Symmetry XQR=XQL XQM=XQR R=RX=0 R=RX=1 Gatti Fitting is sensitive to shape while the Loop-up Table Method isn’t. Both estimation methods have been shown to give the same resolution.

  9. Bibliography A paper describing this calculation include links to the maple scripts are available at: http://www.physics.ohio-state.edu/~durkin/talks/CrossTalkSensitivityPaper.pdf

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