1. SUMMER INTERSHIP Electronics CERN BE-BI-BL Topic: photo-multiplier’s dynamic range improovements

2. contextualization -1 ms -1 – 10 mA

3. Problematic Linear mode Saturation mode avalanche effect

4. Why saturation?

5. Test Box

6. First results SIMULATIONS Actual system : - loading time ≈ 30 ms - Needed Capa on the last stage ≈ 10 mF (Huge and not possible) EXPERMIMENTS Actual system - Saturations -≠dynamic ranges btw PM First qualitative experiment with the box V config 1  linear tension devideur V config 2  curved tension devider

7. Next Weeks Define more precisely when does the saturation mode begins Run mesurements with several types of electronics Write the users notice of the testing box in english

8. Main Objectiv