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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.

PMT

NCD

DNP, Hawaii 2005

proportional counters

5 cm

n

3H

p

3He

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.

wire

DNP, Hawaii 2005

alpha track to wire
Alpha track  to wire

DNP, Hawaii 2005

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

discharges
Discharges

DNP, Hawaii 2005

oscillatory transients
Oscillatory transients

DNP, Hawaii 2005

forks
“Forks”

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

time

Amplitude

Fork size

DNP, Hawaii 2005

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

peak

DNP, Hawaii 2005

fork cuts
Fork cuts

Normal runs

Neutron source runs

Fork events

DNP, Hawaii 2005

summary
Summary
  • 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