External seismic pre-isolation retrofit design

  title={External seismic pre-isolation retrofit design},
  author={Joseph Anthony Giaime and Brian Lantz and Corwin T. Hardham and Rajindra Adhikari and Edward. J. Daw and D. B. Debra and M. Hammond and Keith Mason and Danny Coyne and David Shoemaker},
This technical note outlines the design of an external seismic pre-isolation system proposed for use in LIGO Livingston. The goal is to reduce the effects of the site’s excess ground noise in the 1 3 Hz frequency band, allowing detector noise performance equivalent to that of the 4 km LIGO Hanford detector. The center histogram in Figure 8 shows the most troubling aspect of the excess noise quite clearly. The typical 1 3 Hz RMS velocity at LHO is about 2× 10−8 m/s, but at LLO it is typically 10… CONTINUE READING

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