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Veto Analysis Marina Del Prete Corso di Dottorato dell’ Universita’ di Siena - PowerPoint PPT Presentation


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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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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 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


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


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


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


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