Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session T4: Earth Based Gravitational Wave Detection |
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Sponsoring Units: GGR Chair: Patrick Brady, University of Wisconsin-Milwaukee Room: Marriott Tampa Waterside Grand Salon C/D |
Monday, April 18, 2005 1:30PM - 2:06PM |
T4.00001: Sensitivity and Stability of the LIGO Interferometers Invited Speaker: Gravitational wave astronomy promises to be a surprising, new way of listening to the universe. In the past 18 months, intensive work on the kilometer scale LIGO (Laser Interferometer Gravitational-wave Observatory) interferometers has led to an order of magnitude improvement in the sensitivity of all three interferometers. Parallel efforts have yielded substantial increases in the duty cycles of the detectors and improved stationarity of the noise. The current state of the detectors will be discussed, the recent sensitivity improvements described in detail, and a path for future upgrades will be mapped out. [Preview Abstract] |
Monday, April 18, 2005 2:06PM - 2:42PM |
T4.00002: Science results from LIGO observing runs Invited Speaker: We will report on the latest results obtained by the LIGO Scientific Collaboration in its searches for different kinds of gravitational wave signals in data collected by the LIGO detectors in the last two years. We have searched for signals originated by inspiraling binary systems and by rotating neutron stars; we also have looked for unmodelled transient signals and for a stochastic background. We will present direct observational upper limits arising from each of these searches. We will discuss the performance of different search methods in real data, in the presence with detector artifacts. [Preview Abstract] |
Monday, April 18, 2005 2:42PM - 3:18PM |
T4.00003: Plans for Advanced LIGO Instruments Invited Speaker: The proposed Advanced LIGO detector will have an increase in sensitivity over initial LIGO by a factor of ten, with an increased bandwidth in the region of highest sensitivity and the ability to tune for specific astrophysical sources. Advanced LIGO will achieve the equivalent of the one-year integrated observation time of initial LIGO in just several hours, allowing observation of astrophysical gravitational waves on a regular basis. The Advanced LIGO detector will replace the existing detector at the LIGO Observatories while retaining the existing building and vacuum system infrastructure. The new instruments build on the initial LIGO Fabry-Perot Michelson Interferometer layout and take advantage of significant advances in technology since the design of initial LIGO in the 1990's. Signal strength/sensitivity will be improved by increasing the laser power, lowering optical absorption, and adding signal recycling to the Fabry-Perot arm cavities. Stray forces on the test masses will be controlled by reducing thermal noise sources in the suspensions and optics and using a multi-staged seismic isolation system with inertial sensing and feedback control. The LIGO laboratory, the LIGO Science Collaboration, and international partners have undertaken a structured program of research and development, including testing of full-scale prototypes in context. Significant progress has been made on several of the detector subsystems. The Advanced LIGO project has been through National Science Foundation peer review and the National Science Board has recommended it for funding. Based on a proposed funding start in 2007, detector installation will begin in 2010, with observations at an advanced level of commissioning in 2013. [Preview Abstract] |
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