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Advanced LIGO

Classical and Quantum Gravity · 2015 · Vol. 32(7) · pp. 074001–074001
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Abstract

The Advanced LIGO gravitational wave detectors are second-generation instruments designed and built for the two LIGO observatories in Hanford, WA and Livingston, LA, USA. The two instruments are identical in design, and are specialized versions of a Michelson interferometer with 4 km long arms. As in Initial LIGO, Fabry–Perot cavities are used in the arms to increase the interaction time with a gravitational wave, and power recycling is used to increase the effective laser power. Signal recycling has been added in Advanced LIGO to improve the frequency response. In the most sensitive frequency region around 100 Hz, the design strain sensitivity is a factor of 10 better than Initial LIGO. In addition, the low frequency end of the sensitivity band is moved from 40 Hz down to 10 Hz. All interferometer components have been replaced with improved technologies to achieve this sensitivity gain. Much better seismic isolation and test mass suspensions are responsible for the gains at lower frequencies. Higher laser power, larger test masses and improved mirror coatings lead to the improved sensitivity at mid and high frequencies. Data collecting runs with these new instruments are planned to begin in mid-2015.

Pulsars and Gravitational Waves ResearchGeophysics and Sensor TechnologyMagnetic confinement fusion researchLIGOPhysicsInterferometryGravitational waveSensitivity (control systems)Michelson interferometerOpticsGravitational-wave observatoryLaserDetector

Funding

  • National Science Foundation
  • National Aeronautics and Space Administration
  • Alfred P. Sloan Foundation
  • Leverhulme Trust
  • Scottish Funding Council
  • Scottish Universities Physics Alliance
  • National Research Foundation
  • Council of Scientific and Industrial Research, India
  • Industry Canada
  • Ministerio de Economía y Competitividad
  • Hungarian Scientific Research Fund
  • National Research Foundation of Korea
  • Ministero dello Sviluppo Economico
  • Istituto Nazionale di Fisica Nucleare
  • Govern de les Illes Balears
  • Science and Technology Facilities Council
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