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Assessing SNO NCD Waveform Quality. Nikolai Tolich. Neutral Current Detectors. Array of 40 proportional counters deployed throughout the detector. These allow NC  interactions to be identified on an event-by-event basis. PMT. NCD. 5 cm. n. 3 H. p. 3 He. Proportional counters.

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neutral current detectors
Neutral Current Detectors
  • Array of 40 proportional counters deployed throughout the detector.
  • These allow NC  interactions to be identified on an event-by-event basis.



DNP, Hawaii 2005

proportional counters

5 cm





Proportional counters
  • 36 counters are filled with 3He

n + 3He  p + 3H+.

  • Ionization from the p and 3H produces a signal on the central wire.
  • The shape of the signal depends on the ionization track orientation.


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alpha track to wire
Alpha track  to wire

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data cleaning
Data cleaning
  • There are also waveforms caused by electronics noise.
  • Two independent methods have been developed to identify this noise:
    • One works in the time domain.
    • The other works in the frequency domain.
  • The goal is to have both the sacrifice and contamination less than 1%.

DNP, Hawaii 2005


DNP, Hawaii 2005

oscillatory transients
Oscillatory transients

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DNP, Hawaii 2005

time domain cuts
Time domain cuts
  • The decay time, pulse width, and pulse amplitude. allow us to identify spikes and forks.

Max half width

Min half width

Decay time



Fork size

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frequency domain cuts
Frequency domain cuts
  • The waveform power spectrum easily identifies oscillations and forks.
  • Fork events typically have a peak 12 MHz.

Neutron event

Fork event


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fork cuts
Fork cuts

Normal runs

Neutron source runs

Fork events

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  • Many different types of noise events have been identified, with cuts implemented for all the major types.
  • There is currently better than 99% agreement between the two data cleaning paths, with a plan to improve this.

DNP, Hawaii 2005