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1. The GEO-HF project

Author

C. A. Cantley, C. Robinson, Benjamin William Allen, Karsten Danzmann, L. Ribichini, Boris Hage, Gerhard Heinzel, Benno Willke, T. Regimbau, B. Barr, A. Grant, S. H. Huttner, S. Babak, Roland Schilling, R. Balasubramanian, Manuel Luna, Yousuke Itoh, C. Aulbert, U. Weiland, Roman Schnabel, D. Churches, V. Re, C. Messenger, Soumya D. Mohanty, Martin Hewitson, Ik Siong Heng, Richard J. K. Taylor, V. Quetschke, Bangalore Suryanarayana Sathyaprakash, Gianpietro Cagnoli, J. R. Smith, R. J. Dupuis, Ian Taylor, Badri Krishnan, C. N. Colacino, M. Malec, Kenneth A. Strain, R. A. Mercer, Karsten Kötter, Yi Chen, Frank Seifert, T. Meier, G. Newton, Alberto Vecchio, Carsten Fallnich, Stefan Hild, Peter Aufmuth, A. Hepstonstall, S. Berukoff, I. Gholami, Walter Winkler, Harald Lück, M. V. Plissi, D. I. Robertson, Hartmut Grote, Henning Vahlbruch, P. Ajith, A. Bunkowski, Stefan Goßler, S. Grunewald, Linqing Wen, Herbert Welling, Alexander Franzen, Graham Woan, Stuart Reid, Thomas Cokelaer, Joseph D. Romano, H. Rehbein, Bernard F. Schutz, Kasem Mossavi, Soma Mukherjee, Jan Harms, P. G. Murray, Andreas Freise, J. H. Hough, Matthew Pitkin, Michael Perreur-Lloyd, P. Kwee, A. M. Sintes, Andre Thüring, E. J. Elliffe, N. A. Robertson, Gareth Jones, B. Machenschalk, R. Zhu, Carlo Ungarelli, Sheila Rowan, Simon Chelkowski, Curt Cutler, H. Ward, John Veitch, Reinhard Prix, Peter H. Sneddon, P. Williams, Roger Jones, Maria Alessandra Papa, Albrecht Rüdiger, David Crooks, Morag M. Casey, and M. Heurs

Subjects
Physics, Upgrade, Gravitational-wave observatory, Physics and Astronomy (miscellaneous), Work (electrical), Emerging technologies, Scale (chemistry), SIGNAL (programming language), Detector, Systems engineering, LIGO
Abstract

The GEO 600 gravitational wave detector uses advanced technologies including signal recycling and monolithic fused-silica suspensions to achieve a sensitivity close to the kilometre scale LIGO and VIRGO detectors. As soon as the design sensitivity of GEO 600 is reached, the detector will be operated as part of the worldwide network to acquire data of scientific interest. The limited infrastructure at the GEO site does not allow for a major upgrade of the detector. Hence the GEO collaboration decided to improve the sensitivity of the GEO detector by small sequential upgrades some of which will be tested in prototypes first. The development, test and installation of these upgrades are named 'The GEO-HF Project.' This paper describes the upgrades considered in the GEO-HF project as well as their scientific reasons. We will describe the changes in the GEO 600 infrastructure and the prototype work that is planned to support these upgrades. Finally, we will point to some laboratory research that identifies new technologies or optical configurations that might undergo a transition into detector subsystems within the GEO-HF project.

Published
2006
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2. Status of the GEO600 detector

Author

S. J. Berukoff, S. H. Huttner, B. Barr, P. G. Murray, Roland Schilling, Peter Aufmuth, T. Meier, Reinhard Prix, G. Newton, Roman Schnabel, J. H. Hough, Gerhard Heinzel, Alberto Vecchio, Sheila Rowan, Benno Willke, V. Quetschke, Bangalore Suryanarayana Sathyaprakash, H. Ward, Graham Woan, Stuart Reid, D. Churches, J. R. Smith, Maria Alessandra Papa, A. Hepstonstall, Curt Cutler, Ian Taylor, Jan Harms, D. I. Robertson, Bernard F. Schutz, Morag M. Casey, M. Heurs, Albrecht Rüdiger, N. A. Robertson, A. Bunkowski, R. Zhu, A. Thüring, F. Seifert, Thomas Cokelaer, John Veitch, C. A. Cantley, Karsten Kötter, C. Robinson, Gareth Jones, Stefan Goßler, B. Machenschalk, Benjamin William Allen, Karsten Danzmann, Carlo Ungarelli, Peter H. Sneddon, R. Balasubramanian, M. V. Plissi, Carsten Fallnich, Stefan Hild, Stanislav Babak, Soma Mukherjee, V. Re, A. M. Sintes, Herbert Welling, S. Grunewald, Roger Jones, Simon Chelkowski, Hartmut Grote, A. Franzen, C. Messenger, L. Ribichini, U. Weiland, H. Rehbein, Andreas Freise, H. Vahlbruch, Walter Winkler, Harald Lück, Matthew Pitkin, Michael Perreur-Lloyd, Kenneth A. Strain, R. A. Mercer, P. R. Williams, P. Ajith, David Crooks, Yousuke Itoh, Ik Siong Heng, I. Gholami, R. J. Dupuis, Richard J. K. Taylor, Gianpietro Cagnoli, Martin Hewitson, A. Grant, E. J. Elliffe, T. Regimbau, Soumya D. Mohanty, Boris Hage, Linqing Wen, Joseph D. Romano, Kasem Mossavi, C. N. Colacino, M. Malec, Yi Chen, Manuel Luna, Badri Krishnan, P. Kwee, and C. Aulbert

Subjects
Physics, Optics, Physics and Astronomy (miscellaneous), business.industry, Duty cycle, Detector, business, GEO600, Sensitivity (electronics)
Abstract

Of all the large interferometric gravitational-wave detectors, the German/British project GEO600 is the only one which uses dual recycling. During the four weeks of the international S4 data-taking run it reached an instrumental duty cycle of 97% with a peak sensitivity of 7 × 10-22 Hz-1/2 at 1 kHz. This paper describes the status during S4 and improvements thereafter.

Published
2006
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3. Gravitational waves, inflation and the cosmic microwave background: towards testing the slow-roll paradigm

Author

Carlo Ungarelli, Pier Stefano Corasaniti, R. A. Mercer, Alberto Vecchio, Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
[PHYS]Physics [physics], Physics, Inflation (cosmology), COSMIC cancer database, Physics and Astronomy (miscellaneous), Slow roll, 010308 nuclear & particles physics, Gravitational wave, Astrophysics (astro-ph), Cosmic microwave background, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy, General Relativity and Quantum Cosmology (gr-qc), Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, General Relativity and Quantum Cosmology, Interferometry, Big Bang Observer, 0103 physical sciences, Sensitivity (control systems), 010306 general physics
Abstract

One of the fundamental and yet untested predictions of inflationary models is the generation of a very weak cosmic background of gravitational radiation. We investigate the sensitivity required for a space-based gravitational wave laser interferometer with peak sensitivity at $\sim 1$ Hz to observe such signal as a function of the model parameters and compare it with indirect limits that can be set with data from present and future cosmic microwave background missions. We concentrate on signals predicted by slow-roll single field inflationary models and instrumental configurations such as those proposed for the LISA follow-on mission: Big Bang Observer., Comment: 10 pages, 2 figures, uses iopart.cls. Typos corrected, references added, accepted for publication in Classical and Quantum Gravity

Published
2005
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