LIGO-G040032-00-Z TFClusters Tuning for the LIGO-TAMA Search Patrick Sutton LIGO-Caltech.

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Presentation transcript:

LIGO-G Z TFClusters Tuning for the LIGO-TAMA Search Patrick Sutton LIGO-Caltech

LIGO-G ZSutton 2004/02/05 U. Florida2 Goal: determine parameters for the production running of TFClusters over the three LIGO IFOs for the LIGO-TAMA coincidence analysis. »TAMA: fixed low rate ( 15 x noise floor. Strategy: determine the efficiency and false rate as functions of TFClusters parameters, then select parameters to give lowest false rate while maintaining sensitivity to events detectable by TAMA. »Combine antenna patterns and single-IFO efficiencies to select a sensible target rate for each LIGO detector. Overview

LIGO-G ZSutton 2004/02/05 U. Florida3 Tuning Preliminaries Restrict to triggers overlapping TAMA frequency range: [ ]Hz (“soft cut”). Tune for best efficiency versus false rate to Q~9 sine- Gaussians centered at f 0 = 1200Hz (minimum of the LIGO and TAMA S2 noise curves).

LIGO-G ZSutton 2004/02/05 U. Florida4 Procedure Preliminary parameter sweep: Follow method of Sylvestre (see ). Examine how different parameters affect false rate. Fix alpha=1 (no secondary threshold on clusters). set TFCThr "(\\\\\[1e-3,3e-2,16,l\\\\\])" set TFCWin "1" set TFCThrMethod "0" set TFCdata "0" set TFCTRez "(7.8125e-3, , ,0.0625)" set TFCFmin "-700.0" set TFCFmax " " set TFCalpha "(1.0)" set TFCsigma "(2,3,4,5,6)" set TFCdelta "0,0,0,0,0,0,0,0,0,0,0,0,0,0,0" black pixel prob (bpp) time resolution (sec) min cluster size (pixels)

LIGO-G ZSutton 2004/02/05 U. Florida5 Procedure Target rate: Select parameter sets for each IFO that give event rates (unclustered) in the ranges [ , ]Hz ~ 0.3Hz and [ , ] Hz ~ 1Hz. Simulations: Re-run with these parameter sets, but including injected sine-Gaussians at 1200Hz. set waveforms "SG1200" set injAmp "(\\\\\[3e-20,3e-18,21,l\\\\\])" peak amplitude Plot: h 50% versus rate for each IFO, sorted by bpp, sigma, and time resolution. Results: Best efficiencies at given rate were for the smallest cluster sizes (sigma = 2) and time resolution (1/128sec), and the lowest black pixel probability.

LIGO-G ZSutton 2004/02/05 U. Florida6 EXAMPLE Best efficiency: low bpp (high threshold)

LIGO-G ZSutton 2004/02/05 U. Florida7 EXAMPLE Best efficiency: low sigma (cluster size)

LIGO-G ZSutton 2004/02/05 U. Florida8 EXAMPLE Best efficiency: short time resolution

LIGO-G ZSutton 2004/02/05 U. Florida9 Tuning Rules of Thumb 1. For alpha=1, use sigma=2, time resolution = 1/128sec (small clusters and short time resolution). 2. Adjust only the black pixel probability to achieve the desired false rate: log 10 (rate) = m log 10 (bpp) + b H1: m = 1.23 b = 3.12 H2: m = 1.24 b = 3.12 L1: m = 1.11 b = 2.95

LIGO-G ZSutton 2004/02/05 U. Florida10 Efficiency vs. Rate Nail down the efficiency versus false rate curve for each detector over whole 4x playground using a few different bpps. Find power-law fit of h 50% vs rate is good to about 10% for each detector: log 10 (h 50% ) = m log 10 (rate) + b H1: m = b = H2: m = b = L1: m = b =

LIGO-G ZSutton 2004/02/05 U. Florida11 EXAMPLE

LIGO-G ZSutton 2004/02/05 U. Florida12

LIGO-G ZSutton 2004/02/05 U. Florida13 Next Steps Combine with TAMA efficiency to make final tuning choice (bpp). »Use Monte Carlo to estimate effect of antenna patterns. Find safety margin to leave in the LIGO tuning to ensure detectability of signals seen by TAMA. Test efficiencies for other waveforms (sine-Gaussians, Gaussians, supernovae) to make sure this tuning is not pathological in some way. Generate trigger lists for each IFO and proceed to coincidence.