1. Time over Threshold Electronics for Neutrino Telescopy George Bourlis + multiplicity

2. ReadOut Electronics GPS Input USB PortTrigger Output5 PMT Signal Inputs 25ps accuracy TDC HPTDC 32 channels (LR) – 8 Channels (HR) 25ps (HR) to 100 ps (LR) accuracy Self Calibrating

3. ReadOut Electronics

4. EZ-USB FX2 HPTDC CONTROL

6. Card Debugging Configuration Trigger Input splitter discrimi nator - Offset of each input - Scale of each input - Timing among input channels

7. Sample Pulses Input 1

8. Sample Pulses Input 1

9. Sample Pulses Input 1

10. The Photomultiplier Tube: PH: XP1912 Charge (pCb) Single p.e Gain vs HV Calibration @ “nominal” H.V. gain: ~ 4 10 5 /p.e. ~ 0.07pCb /p.e. ~ 1.05mV Rise Time: 1.2 ns Charge (in units of mean p.e. charge) At the Detector Center  Data - Monte Carlo Prediction

11. Charge versus Time Over Threshold Charge (pC) Time Over Threshold (s) 1 st Threshold only 1 st & 2 nd Threshold 1 st, 2 nd & 3 rd Threshold 4mV 50mV 15mV

12. Charge Parameterization 1 st & 2 nd Threshold1 st, 2 nd & 3 rd Threshold

13. Charge Estimation 1 st & 2 nd Threshold1 st, 2 nd & 3 rd Threshold 11%8% - Estimated Resolution ~10% - Better if all thresholds are crossed

14. Charge Estimation 1 st & 2 nd Threshold1 st, 2 nd & 3 rd Threshold - σ=(1.01 ± 0.01) (2 thresholds) - σ=(1.1 ± 0.1) (3 thresholds)

15. Time (ns) Trigger Input