1. Status on Testbeam Analysis Jianchun Wang Syracuse University VELO meeting, August 28, 2007

2. 8/28/2007JC Wang2 Beam Condition HP4 data at normal incidence, ~ 1.8M trigger events. X (mm) Y (mm)

3. 8/28/2007JC Wang3 Tracking Quality

4. 8/28/2007JC Wang4 Sensor 31 (M30R) Total Charge (ADC counts) Cluster Size Seed Threshold = 10 Low Threshold = 4 ADC Sum Threshold = 20

5. 8/28/2007JC Wang5 Unbiased Residual & Charge Sharing Residual (  m) Q n+1 /(Q n +Q n+1 )  = 14.1  m

6. 8/28/2007JC Wang6 S-curve Correction Q n+1 /(Q n +Q n+1 ) Residual (  m) 14.1  m  13.2  m

7. 8/28/2007JC Wang7 Resolution vs Pitch Pitch Size (  m) Residual Sigma (  m)

8. 8/28/2007JC Wang8 Detection Efficiency vs Thresholds Standard threshold set used: Seed = 10, Low Threshold = 4, ADC Sum = 20

9. 8/28/2007JC Wang9 Resolution vs Threshold Tracking resolution is not removed. Standard threshold set used: Seed = 10, Low Threshold = 4, ADC Sum = 20

10. 8/28/2007JC Wang10 Resolution Vs Efficiency Standard threshold set used: Seed = 10, Low Threshold = 4, ADC Sum = 20