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Physics Laboratory. School of Science and Technology. Hellenic Open University. +. multiplicity. George Bourlis. Time over Threshold Electronics for Neutrino Telescopy. ReadOut Electronics. 5 PMT Signal Inputs. Trigger Output. USB Port. HPTDC

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Physics Laboratory

School of Science and Technology

Hellenic Open University

+

multiplicity

George Bourlis

Time over Threshold Electronics for Neutrino Telescopy


Readout electronics
ReadOut Electronics

5 PMT Signal Inputs

Trigger Output

USB Port

  • HPTDC

  • 32 channels (LR) – 8 Channels (HR)

  • 25ps (HR) to 100 ps (LR) accuracy

  • Self Calibrating

25ps accuracy TDC

GPS Input




Card debugging configuration
Card Debugging Configuration

splitter

discriminator

splitter

Input

Trigger

  • Offset of each input

  • Scale of each input

  • Timing among input channels


Sample pulses
Sample Pulses

Input 1


Sample pulses1
Sample Pulses

Input 1


Sample pulses2
Sample Pulses

Input 1


@ “nominal” H.V.

gain: ~ 4 105

<charge>/p.e. ~ 0.07pCb

<pulse height>/p.e. ~ 1.05mV

Rise Time: 1.2 ns

Single p.e

At the Detector Center

  • Data

    - Monte Carlo Prediction

Charge (pCb)

Charge (in units of mean p.e. charge)

The Photomultiplier Tube: PH: XP1912

Gain vs HV

Calibration


Charge versus time over threshold

Charge (pC)

1st Threshold only

1st, 2nd & 3rd Threshold

1st & 2nd Threshold

Time Over Threshold (s)

Charge versus Time Over Threshold

50mV

15mV

4mV


Charge parameterization
Charge Parameterization

1st & 2nd Threshold

1st, 2nd & 3rd Threshold


Charge estimation

11%

8%

Charge Estimation

1st & 2nd Threshold

1st, 2nd & 3rd Threshold

- Estimated Resolution ~10%

- Better if all thresholds are crossed


Charge estimation1
Charge Estimation

1st & 2nd Threshold

1st, 2nd & 3rd Threshold

- σ=(1.01 ± 0.01) (2 thresholds)

- σ=(1.1 ± 0.1) (3 thresholds)


Input

Trigger

Time (ns)


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