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Overview of Environmental Factors Impacting LIGO Instrument Design and Operation

This document provides an overview of the environmental conditions at LIGO sites (LLO and LHO) that are vital to the design and operation of gravitational wave detection instruments. It includes pointers to additional information and addresses measurable factors impacting instrument performance. The document aims to standardize environmental data collection and updates, ensuring a reference point for ongoing analysis and design requirements. It highlights the need for regular updates and the creation of dedicated websites for each observatory to facilitate access to current data and references.

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Overview of Environmental Factors Impacting LIGO Instrument Design and Operation

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  1. LIGObservatory Environment David Shoemaker 3 July 2001

  2. Purpose • An overview of the environment at the LIGO sites relevant to the design and operation of the instruments • Will provides pointers to additional sources of information • Document is organized by the quantity measured, dealing first with one site (LLO) and then the other (LHO) • The scope of this document covers those aspects of the environment which directly relate to the instrument design and performance • Criterion: if it changes during operation, the performance of the interferometer might change • Should be complementary to the ‘Generic Requirements for Detector Subsystems’ and the two should span the space

  3. Long-term goals Document should • consist of standard plots for similar measurements at different times and places and between sites • give pointers to data for the plots to allow quantitative analysis, and give fits and approximations for estimates • carry references to the measurements • be updated regularly to indicate the latest information on the measured quantities • Notion: create web sites for each observatory to carry data, additional information • Maintain a single ‘paper’ document of top-level current information …clearly, some work yet to do.

  4. How has, how will this happen? • Growing base of information: Schofield, Giaime, Daw, Johnson, Chatterji, Marka, … • LSC Detector Characterization group: Riles et alia • Upper Limit characterization effort • Continuing attention from the Detector systems group

  5. ‘Standard’ seismic spectrum

  6. Seismic variabilityLHO LLO

  7. Newtonian background

  8. Spectrum at Seismic Supports

  9. Magnetic fields

  10. Residual gas

  11. So… • Work to do to finish an initial round of collecting existing data • On-going work to maintain ‘environmental references’ for operation, analysis, design

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