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Time over Threshold Electronics for Neutrino Telescopy

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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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Presentation Transcript
slide1
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
slide10
@ “nominal” H.V.

gain: ~ 4 105

/p.e. ~ 0.07pCb

/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)

slide15
Input

Trigger

Time (ns)

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