The STACK-SLIDE Search Initial Report: PULG F2F UWM June 2003

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Presentation transcript:

The STACK-SLIDE Search Initial Report: PULG F2F UWM June 2003 Gregory Mendell, Mike Landry LIGO Hanford Observatory LIGO-G030295-00-W

Initial STACK-SLIDE Proposal Mendell/Landry at LHO to code stack slide algorithm based on Brady/Creighton gr-qc/9812014 We are in the very preliminary stages of this project, trying to answer questions like Is anyone else planning on working on this (emailed Creighton/Brady/Riles/Chin)? Is there any known problem with stack slide? Is Hough all we need? Do we need to modify B/C algorithm? Stack slide SFTs, DeFTs, or F-stat? Algorithm will be coded under LAL, and search run under LDAS Driver code will be available to all (detailed understanding of LDAS not required) Parallel search; exploit ~THz LDAS computing power Efficient I/O of SFTs, results database (or frame output) inherent in LDAS We will have a more complete proposal/progress report at the June F2F Code written and working by the August LSC meeting LIGO-G030295-00-W

Definitions T0 = observation time. M = number of data segments (number of stacks). N = number of data points in one segment. NT = total number of data points in T0. A = signal amplitude.  = square root variance of the noise. LIGO-G030295-00-W

Coherent Search For A2NM > 42 : Detection if: False Alarm Rate: LIGO-G030295-00-W

Coherent Power vs. Freq LIGO-G030295-00-W

STACK-SLIDE Search One stack: For A2N < 2 : (Ave M stacks) Detection if: False Alarm Rate: (Brady/Creighton gr-qc/9812014)  = Incomplete Gamma Function LIGO-G030295-00-W

STACK-SLIDE Power vs. Freq LIGO-G030295-00-W

Stacking and Sliding… LIGO-G030295-00-W

Complexity? Complexity STACK-SLIDE = O(MNlog2N) + O( NM2)? Complexity SFT Coherent Per Sky Position =O( MNlog2N) + O(kNM2)? Complexity Coherent FFT Resampled Time Series Per Sky Position =O( MNlog2MN)? LIGO-G030295-00-W

We are still working to… Understand the Algorithm. Understand the Computational Complexity. Understand the Statistics. LIGO-G030295-00-W

Brady/Creighton algorithm and potential modifications Resample? Or use SFTs, DeFTs, F-stat From LALDemod The algorithm shown in the Flowchart is iterated in a hierarchical approach LIGO-G030295-00-W

Will Provide LDAS, LAL, & Driver Code LDAS code will be based on knownpulsardemod DSO. LAL parameter space metric code exists. Need LAL STACK-SLIDE function. User-friendly driver code that anyone can run. LIGO-G030295-00-W

LDAS Code To Write LIGO-G030295-00-W

Example Driver getFstat Usage: ./getFstat_v1.tclsh <site> <ifo> <start_time> <duration> <templateFreq0> <band_width> <sft_time> <framecachefile> <templatefile> <outputdatabase> <outfile> [<run>] Example: ./getFstat_v1.tclsh lho H1 729976096 8192 1283.5 2 2048 SFTFrameCache_H1_040203.txt testJ1939.params ldas_tst testFstat.xml run Starting Thu Jun 12 12:51:54 PDT 2003 LDAS job with LJrun at lho; User: gmendell; Job id: LDAS-WA890236. LDAS job succeeded. Total time to run job = 76 seconds. [gmendell@vulcan scripts]$ less testFstat.xml ... <LIGO_LW Name=":data:Container(Vect):Frame"> <Dim Scale="1.2207031250000000e-04" Start="1.2825000000000000e+03" Unit="hz">16388</Dim> Name="data" Type="Local"> 2.6003204903121175e+00,2.3834808600241506e+00,2.7261332694330522e+00,... LIGO-G030295-00-W