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Veto Analysis Marina Del Prete Corso di Dottorato dell’ Universita’ di Siena

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Dark Fringe. Seismometer. It is a gravewave?. Or did something locally create this ?. Veto Analysis Marina Del Prete Corso di Dottorato dell’ Universita’ di Siena. We search for a transient like signal or burst event which could be a signal from a supernova event

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Presentation Transcript
slide1

Dark Fringe

Seismometer

It is a gravewave?

Or did something

locally create this?

Veto Analysis

Marina Del Prete

Corso di Dottorato dell’ Universita’ di Siena

slide2

We search for a transient like signal or burst event

  • which could be a signal from a supernova event
  • A burst waveform is not well known and
  • there are many kind of techniques to search
  • for “generic” burst signals.

We have to face the problem of noise in the experimental apparatus which can mimic a GW signal.

We have a Dark Fringe signal (where we expect to observe the event of supernova), and many environmental monitoring and auxiliary channels

It can be convenient to apply a veto analysis

slide3

I have a peak in Dark Fringe and

in the enviromental channel.

I have only a peak in Dark Fringe

  • Set a threshold on the event SNR for the Dark Fringe (SNR> 5) and the enviromental channels
  • The second step is to check at each time what happens within some interval Dt.

Dark Fringe channel

Enviromental channel

It is a possible good event

It is possible that the signal

in the Dark Fringe is a glitch

It can be appropriate to apply a Veto on

the Signal in Dark Fringe

slide4

How to decide if it is a good idea

to apply a veto analysis on a specific channel?

There are three fundamental parameters……

Nntv = # events above threshold and vetoed by noise channel

Nnt= # events above threshold in the noise channel

Use Percentage = 100 * ( Nntv/ Nnt)

Nstv = # events above threshold and vetoed in Dark Fringe channel

Nst = # events above threshold in the Dark Fringe channel

Veto Efficiency = 100 * (Nstv/ Nst)

Dt = time window of vetoed analysis

Dtn= time interval between two peaks of noise channel < Dt

Dead time = (Nnt * Dt – Dtn)/run time

slide5

Dt = 0.6 sec

Use perc = 90%

Veto efficiency =0.65%

Seism. at Beam Splitter

Dt = 0.3 sec

Seism. at ModeCleaner

Use perc = 25%

Veto efficiency =0.7%

Dt = 0.6 sec

Dt = 0.3 sec

It is appropriate to apply a veto in a specific channel

if we have a high value of use percentage (>50%)

and a low value of the dead time (<1%)

  • High value of use percentage
  • and low value of dead time
  • It is appropriate to apply the veto
  • analysis to this channel
  • Low value of use percentage
  • It is not appropriate to apply
  • the veto analysis to this channel