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Status Report on CW Discriminator Work Keith Riles / Dave Chin / Huimin Hu University of Michigan

Status Report on CW Discriminator Work Keith Riles / Dave Chin / Huimin Hu University of Michigan. Antenna Pattern Code. Basic code & documentation ( Dave Chin ) installed in LAL in Summer 2000, but very little work done since Remaining tasks: Vectorize the routines for more efficiency

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Status Report on CW Discriminator Work Keith Riles / Dave Chin / Huimin Hu University of Michigan

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  1. Status Report on CW Discriminator Work Keith Riles / Dave Chin / Huimin Hu University of Michigan K. Riles - University of Michigan

  2. Antenna Pattern Code • Basic code & documentation (Dave Chin) installed in LAL in Summer 2000, but very little work done since • Remaining tasks: • Vectorize the routines for more efficiency • Add option for sensitivity to scalar waves (R. Wagoner request) • Beef up the documentation, including a LIGO technical note • Finalize the structures describing the IFO locations and orientations (Dave working with John Whelan et al on this) • All straightforward - just have to make the time K. Riles - University of Michigan

  3. Instrumental Lines • Known mechanical resonances (>150) in Hanford 2K added to meta-database: • Original list from M. Landry & D. Ottaway (LIGO-T000020-00) • Basic entries: • Best known central frequency • Best known FWHM in frequency • Bit flag for additional info (e.g., phase for coherent lines) • Sample entries for butterfly test mass resonance at 6747.5 Hz: Name=Line:H2:6747.5:freq0:mirror Value=6747.5 Name=Line:H2:6747.5:fwid0:mirror Value=0.0052 Name=Line:H2:6747.5:finfo:mirror Value=0.0 (no addl info yet) (nominal line value used as common index in variable name) • This naming scheme circulated to ASIS in December 2000 K. Riles - University of Michigan

  4. Instrumental Lines • Much work to do: • Write LAL-compatible code to extract database entries and store in suitable structures for use in CW search • Write online code to sift through DMT line monitor (S. Klimenko) output (trend frames) to extract and store into database long-term phase/amplitude parameters of coherent lines (60 Hz & harmonics) • Write DMT code to search continuously for unknown lines of width <1 mHz for “manual” investigation. • Write stand-alone code to look for solar-day modulations in candidate sharp instrumental lines • One active person on this at present: Huimin Hu (New grad student - wrote C code for initial database entry) (KR to lend a hand when classes end) K. Riles - University of Michigan

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