Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Harry, Gregory"'
Autor:
Penn, Steven D., Kinley-Hanlon, Maya M., MacMillan, Ian A. O., Heu, Paula, Follman, David, Deutsch, Christoph, Cole, Garrett D., Harry, Gregory M.
We investigated elastic loss in GaAs/AlGaAs multilayers to help determine the suitability of these coatings for future gravitational wave detectors. We measured large ($\approx 70$-mm diameter) substrate-transferred crystalline coating samples with a
Externí odkaz:
http://arxiv.org/abs/1811.05976
Autor:
Harry, Gregory M., Abernathy, Matthew R., Becerra-Toledo, Andres E., Armandula, Helena, Black, Eric, Dooley, Kate, Eichenfield, Matt, Nwabugwu, Chinyere, Villar, Akira, Crooks, D. R. M., Cagnoli, Gianpietro, Hough, Jim, How, Colin R., MacLaren, Ian, Murray, Peter, Reid, Stuart, Rowan, Sheila, Sneddon, Peter H., Fejer, Martin M, Route, Roger, Penn, Steven D., Ganau, Patrick, Mackowski, Jean-Marie, Michel, Christophe, Pinard, Laurent, Remillieux, Alban
Publikováno v:
Class.Quant.Grav.24:405-416,2007
Reducing thermal noise from optical coatings is crucial to reaching the required sensitivity in next generation interferometric gravitational-waves detectors. Here we show that adding TiO$_2$ to Ta$_2$O$_5$ in Ta$_2$O$_5$/SiO$_2$ coatings reduces the
Externí odkaz:
http://arxiv.org/abs/gr-qc/0610004
Autor:
Penn, Steven D., Ageev, Alexander, Busby, Dan, Harry, Gregory M., Gretarsson, Andri M., Numata, Kenji, Willems, Phil
We have compiled measurements of the mechanical loss in fused silica from samples spanning a wide range of geometries and resonant frequency in order to model the known variation of the loss with frequency and surface-to-volume ratio. This improved u
Externí odkaz:
http://arxiv.org/abs/gr-qc/0507097
Autor:
van Putten, Maurice H. P. M., Levinson, Amir, Lee, Hyun Kyu, Regimbau, Tania, Punturo, Michele, Harry, Gregory M.
Publikováno v:
Phys.Rev.D69:044007,2004
Gamma-ray bursts are believed to originate in core-collapse of massive stars. This produces an active nucleus containing a rapidly rotating Kerr black hole surrounded by a uniformly magnetized torus represented by two counter-oriented current rings.
Externí odkaz:
http://arxiv.org/abs/gr-qc/0308016
Autor:
Mortonson, Michael J., Vassiliou, Christophoros C., Ottaway, David J., Shoemaker, David H., Harry, Gregory M.
Publikováno v:
Rev.Sci.Instrum.74:4840-4845,2003
We report on the effects of an electrical charge on mechanical loss of a fused silica disk. A degradation of Q was seen that correlated with charge on the surface of the sample. We examine a number of models for charge damping, including eddy current
Externí odkaz:
http://arxiv.org/abs/gr-qc/0308001
Autor:
Penn, Steven D., Sneddon, Peter H., Armandula, Helena, Betzwieser, Joseph C., Cagnoli, Gianpietro, Camp, Jordan, Crooks, D. R. M., Fejer, Martin M., Gretarsson, Andri M., Harry, Gregory M., Hough, Jim, Kittelberger, Scott E., Mortonson, Michael J., Route, Roger, Rowan, Sheila, Vassiliou, Christophoros C.
Publikováno v:
Class.Quant.Grav. 20 (2003) 2917-2928
Current interferometric gravitational wave detectors use test masses with mirror coatings formed from multiple layers of dielectric materials, most commonly alternating layers of SiO2 (silica) and Ta2O5 (tantala). However, mechanical loss in the Ta2O
Externí odkaz:
http://arxiv.org/abs/gr-qc/0302093
Autor:
Harry, Gregory M., Gretarsson, Andri M., Saulson, Peter R., Penn, Steven D., Startin, William J., Kittelberger, Scott, Crooks, D. R. M., Hough, Jim, Cagnoli, Gianpietro, Nakagawa, Norio, Rowan, Sheila, Fejer, Martin M.
Publikováno v:
Class.Quant.Grav. 19 (2002) 897-918
We report on thermal noise from the internal friction of dielectric coatings made from alternating layers of Ta2O5 and SiO2 deposited on fused silica substrates. We present calculations of the thermal noise in gravitational wave interferometers due t
Externí odkaz:
http://arxiv.org/abs/gr-qc/0109073
Publikováno v:
Phys.Rev. D65 (2002) 082001
We compare two advanced designs for gravitational-wave antennas in terms of their ability to detect two possible gravitational wave sources. Spherical, resonant mass antennas and interferometers incorporating resonant sideband extraction (RSE) were m
Externí odkaz:
http://arxiv.org/abs/gr-qc/0105020
Autor:
Penn, Steven D., Harry, Gregory M., Gretarsson, Andri M., Kittelberger, Scott E., Saulson, Peter R., Schiller, John J., Smith, Joshua R., Swords, Sol O.
Publikováno v:
Rev.Sci.Instrum. 72 (2001) 3670-3673
We have measured the mechanical dissipation in a sample of fused silica drawn into a rod. The sample was hung from a multiple-bob suspension, which isolated it from rubbing against its support, from recoil in the support structure, and from seismic n
Externí odkaz:
http://arxiv.org/abs/gr-qc/0009035
Autor:
Gretarsson, Andri M., Rowan, Sheila, Cagnoli, Geppo, Harry, Gregory M., Hough, Jim, Penn, Steven D., Saulson, Peter R., Startin, William J.
Publikováno v:
Phys.Lett. A270 (2000) 108-114
The use of fused-silica ribbons as suspensions in gravitational wave interferometers can result in significant improvements in pendulum mode thermal noise. Surface loss sets a lower bound to the level of noise achievable, at what level depends on the
Externí odkaz:
http://arxiv.org/abs/gr-qc/9912057