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Type: Journal article
Title: Advanced LIGO
Author: LIGO Scientific Collaboration
Aasi, J.
Abbott, B.
Abbott, R.
Abbott, T.
Abernathy, M.
Ackley, K.
Adams, C.
Adams, T.
Addesso, P.
Adhikari, R.
Adya, V.
Affeldt, C.
Aggarwal, N.
Aguiar, O.
Ain, A.
Ajith, P.
Alemic, A.
Allen, B.
Amariutei, D.
et al.
Citation: Classical and Quantum Gravity, 2015; 32(7):074001-1-074001-41
Publisher: Institute of Physics Publishing
Issue Date: 2015
ISSN: 0264-9381
Statement of
The LIGO Scientific Collaboration ... S E Hollitt ... D J Hosken ... E J King ... J Munch ... D J Ottaway ... P J Veitch ... et al.
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.
Keywords: gravitational waves; interferometers; seismic isolation; optics
Description: Part of Focus Issue: Advanced Interferometric Gravitational Wave Detectors
Rights: © 2015 IOP Publishing Ltd
RMID: 0030026026
DOI: 10.1088/0264-9381/32/7/074001
Appears in Collections:IPAS publications

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