1. September 2006 / 1

2. / 2 1) GaAs, who needs it anyway ? 2) IV - Measurments 3) IT - Measurments 4) CCD - Measurments Overview

3. September 2006 / 3 1. Fast tuning of beam. 2. Detection of high energy electrons (from 2 photon processes). 3. Shield inner detector from backscattered electrons & synchrotron radiation. BeamCal

4. September 2006 / 4 1. Linear response. 2. Fast response & short dead time. 3. Confined shower within. 4. Compactness. 5. High granularity. 6. Handle high radiation doses (up to 10MGy/year) without significant degradation. Detector requirements Semiconductors

5. September 2006 / 5 1. Impurities / traps dark current at room temp’ + hysteresis. 2. Charge Collection Distance (CCD). Energy deposited energy measured. Need-to-know facts about GaAs

6. September 2006 / 6 IV - Measurements

7. September 2006 / 7 The Need for IT Measurements

8. September 2006 / 8 IT – both sensors in the air

9. September 2006 / 9 IT – both sensors in the air

10. September 2006 / 10 IT – both sensors in the air

11. September 2006 / 11 Sensor positionsbase sample sensors

12. September 2006 / 12 Both sensors in the air IT – one sensor on base

13. September 2006 / 13 IT – one sensors on base

14. September 2006 / 14 IT – one sensors on base

15. September 2006 / 15 IT – Analysis

16. September 2006 / 16 Average distance “traveled” before recombination or trapping. Average distance “traveled” before recombination or trapping. 90 Sr - source Charge Collection Distance

17. September 2006 / 17 Minimum Ionizing Particle

18. September 2006 / 18 Charge Collection Distance

19. September 2006 / 19