The path to the enhanced and advanced LIGO gravitational-wave detectors

We report on the status of the Laser Interferometric Gravitational-Wave Observatory (LIGO) and the plans and progress toward Enhanced and Advanced LIGO. The initial LIGO detectors have finished a two-year long data run during which a full year of triple-coincidence data was collected at design sensitivity. Much of this run was also coincident with the data runs of interferometers in Europe, GEO600 and Virgo. The joint analysis of data from this international network of detectors is ongoing. No gravitational wave signals have been detected in analyses completed to date. Currently two of the LIGO detectors are being upgraded to increase their sensitivity in a program called Enhanced LIGO. The Enhanced LIGO detectors will start another roughly one-year long data run with increased sensitivity in 2009. In parallel, construction of Advanced LIGO, a major upgrade to LIGO, has begun. Installation and commissioning of Advanced LIGO hardware at the LIGO sites will commence at the end of the Enhanced LIGO data run in 2011. When fully commissioned, the Advanced LIGO detectors will be ten times as sensitive as the initial LIGO detectors. Advanced LIGO is expected to make several gravitational-wave detections per year.

[1]  M. M. Casey,et al.  Searching for a Stochastic Background of Gravitational Waves with the Laser Interferometer Gravitational-Wave Observatory , 2007 .

[2]  N. Mavalvala,et al.  Readout and control of a power-recycled interferometric gravitational-wave antenna. , 2001, Applied optics.

[3]  Peter Fritschel,et al.  Alignment of an interferometric gravitational wave detector. , 1998, Applied optics.

[4]  M. M. Casey,et al.  The status of GEO600 , 2000 .

[5]  N. Leroy,et al.  Gravitational wave burst search in the Virgo C7 data , 2008, 0812.4870.

[6]  et al,et al.  Search for gravitational waves from binary inspirals in S3 and S4 LIGO data , 2007, 0704.3368.

[7]  Joshua R. Smith,et al.  Implications for the origin of GRB 070201 from LIGO observations , 2007 .

[8]  First joint search for gravitational-wave bursts in LIGO and GEO 600 data , 2008, 0807.2834.

[9]  Joshua R. Smith,et al.  LIGO: the Laser Interferometer Gravitational-Wave Observatory , 1992, Science.

[10]  J. Cleymans,et al.  Transition from baryon-to meson-dominated freeze-out—early decoupling around 30 A GeV? , 2006, nucl-th/0701080.

[11]  et al,et al.  Detector description and performance for the first coincidence observations between LIGO and GEO , 2004 .

[12]  M. M. Casey,et al.  The GEO-HF project , 2006 .

[13]  M. M. Casey,et al.  Upper limits on gravitational wave emission from 78 radio pulsars (Physical Review D - Particles, Fields, Gravitation and Cosmology (2007) 76, (042001)) , 2007, gr-qc/0702039.

[14]  G. D. Visme,et al.  The frequency spectrum of Barkhausen noise , 1972 .

[15]  dc readout experiment at the Caltech 40m prototype interferometer , 2008 .

[16]  G. Russo,et al.  Virgo upgrade investigations , 2006 .

[17]  M. M. Casey,et al.  Upper limits on gravitational wave emission from 78 radio pulsars (Physical Review D - Particles, Fields, Gravitation and Cosmology (2007) 76, (042001)) , 2007, gr-qc/0702039.

[18]  M. M. Casey,et al.  Search for gravitational-wave bursts in LIGO data from the fourth science run , 2007, 0704.0943.

[19]  T. Hayler,et al.  Beating the Spin-Down Limit on Gravitational Wave Emission from the Vela Pulsar , 2011 .

[20]  Michael Perreur-Lloyd,et al.  Quadruple suspension design for Advanced LIGO , 2002 .

[21]  M. Loupias,et al.  Status of Virgo , 2004 .

[22]  B. J. Meers,et al.  Recycling in laser-interferometric gravitational-wave detectors. , 1988, Physical review. D, Particles and fields.

[23]  F. Nocera.  LIGO laser intensity noise suppression , 2004 .