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6 results on '"Audley, H."'

1. LISA Pathfinder closed-loop analysis: a model breakdown of the in-loop observables

Author

LISA Pathfinder Collaboration, Audley, H., Born, M., Danzmann, K., Diepholz, I., Heinzel, G., Hewitson, M., Karnesis, N., Kaune, B., Korsakova, N., Paczkowski, S., Reiche, J., Troebs, M., Wanner, G., Wissel, L., and Wittchen, A.

Subjects
analysis, ddc:530, gravitational wave detection, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, LISA Pathfinder
Abstract

This paper describes a methodology to analyze, in the frequency domain, the steady-state control performances of the LISA Pathfinder mission. In particular, it provides a technical framework to give a comprehensive understanding of the spectra of all the degrees of freedom by breaking them down into their various physical origins, hence bringing out the major contributions of the control residuals. A reconstruction of the measured in-loop output, extracted from a model of the closed-loop system, is shown as an instance to illustrate the potential of such a model breakdown of the data.

Published
2017
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2. Sub-Femto- g Free Fall for Space-Based Gravitational Wave Observatories: LISA Pathfinder Results

Author

Armano, M., Audley, H., Auger, G., Baird, J.T., Bassan, M., Binetruy, P., Born, Michael, Bortoluzzi, D., Brandt, N., Caleno, M., Carbone, L., Cavalleri, A., Cesarini, A., Ciani, G., Congedo, G., Cruise, A.M., Danzmann, Karsten, De Deus Silva, M., De Rosa, R., and Diaz-Aguiló, M.

Subjects
Gravitationswelle, Readout noise, Observatories, Gravitational effects, Brownian noise, Gravity waves, Flight experiments, LISA Pathfinder, Orders of magnitude, Spectral density, Power spectral density, Ion beams, Gravitational-wave observatory, ddc:530, ddc:500, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, Dewey Decimal Classification::500 | Naturwissenschaften, Gravitation
Abstract

We report the first results of the LISA Pathfinder in-flight experiment. The results demonstrate that two free-falling reference test masses, such as those needed for a space-based gravitational wave observatory like LISA, can be put in free fall with a relative acceleration noise with a square root of the power spectral density of 5.2±0.1 fm s−2/Hz, or (0.54±0.01)×10−15 g/Hz, with g the standard gravity, for frequencies between 0.7 and 20 mHz. This value is lower than the LISA Pathfinder requirement by more than a factor 5 and within a factor 1.25 of the requirement for the LISA mission, and is compatible with Brownian noise from viscous damping due to the residual gas surrounding the test masses. Above 60 mHz the acceleration noise is dominated by interferometer displacement readout noise at a level of (34.8±0.3) fm/Hz, about 2 orders of magnitude better than requirements. At f≤0.5 mHz we observe a low-frequency tail that stays below 12 fm s−2/Hz down to 0.1 mHz. This performance would allow for a space-based gravitational wave observatory with a sensitivity close to what was originally foreseen for LISA. CNES 1316634/CNRS 103747 UnivEarthS Labex program/ANR-10-LABX-0023 UnivEarthS Labex program/ANR-11-IDEX-0005-02 DLR Federal Ministry for Economic Affairs and Energy/FKZ 50OQ0501 Federal Ministry for Economic Affairs and Energy/FKZ 50OQ1601 Agenzia Spaziale Italiana Instituto Nazionale di Fisica Nucleare AYA2010-15709 (MICINN) ESP2013-47637-P (MINECO) ESP2015-67234-P (MINECO) Fundacion General CSIC Swiss Space Office (SSO) Swiss National Science Foundation United Kingdom Space Agency (UKSA) University of Glasgow University of Birmingham Imperial College Scottish Universities Physics Alliance (SUPA) U.S. National Aeronautics and Space Administration (NASA)

Published
2016
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3. A Strategy to Characterize the LISA-Pathfinder Cold Gas Thruster System

Author

Armano, M, Audley, H, Auger, G, Baird, J, Binetruy, P, Born, M, Bortoluzzi, D, Brandt, N, Bursi, A, Caleno, M, Cavalleri, A, Cesarini, A, Cruise, M, Danzmann, K, Diepholz, I, Dolesi, R, Dunbar, N, Ferraioli, L, Ferroni, V, Fitzsimons, E, Freschi, M, Gallegos, J, Marirrodriga, C Garcia, Gerndt, R, Gesa, L I, Gibert, F, Giardini, D, Giusteri, R, Grimani, C, Harrison, I, Heinzel, G, Hewitson, M, Hollington, D, Hueller, M, Huesler, J, Inchauspé, H, Jennrich, O, Jetzer, P, Johlander, B, Karnesis, N, Kaune, B, Korsakova, N, Killow, C., Lloro, I, Maarschalkerweerd, R, Madden, S, Mance, D, Martin, V, Martin-Porqueras, F, Mateos, I, McNamara, P, Mendes, J, Mendes, L, Moroni, A, Nofrarias, M, Paczkowski, S, Perreur-Lloyd, M., Petiteau, A, Pivato, P, Plagnol, E, Prat, P, Ragnit, U, Ramos-Castro, J, Reiche, J, Perez, J A Romera, Robertson, D., Rozemeijer, H, Russano, G, Sarra, P, Schleicher, A, Slutsky, J, Sopuerta, C F, Sumner, T, Texier, D, Thorpe, J, Trenkel, C, Tu, H B, Vitale, S, Wanner, G, Ward, H., Waschke, S, Wass, P, Wealthy, D, Wen, S, Weber, W, Wittchen, A, Zanoni, C, Ziegler, T, and Zweifel, P

Subjects
Astronomy, ddc:530, ddc:500, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, Astrophysics, LISA Pathfinder, Konferenzschrift, Dewey Decimal Classification::500 | Naturwissenschaften, Physics, Applied
Abstract

The cold gas micro-propulsion system that will be used during the LISA-Pathfinder mission will be one of the most important component used to ensure the "free-fall" of the enclosed test masses. In this paper we present a possible strategy to characterize the effective direction and amplitude gain of each of the 6 thrusters of this system. Sorbonne Paric Cite/UnivEarthS Labex French Space Ageny (CNES)

Published
2015
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4. Temperature stability in the sub-milliHertz band with LISA Pathfinder.

Author

Armano, M, Audley, H, Baird, J, Binetruy, P, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, Silva, M de Deus, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, and Gesa, L

Subjects
*GRAVITATIONAL waves, *TECHNOLOGY transfer, *TRANSFER functions, *TEMPERATURE measurements, *TEMPERATURE, *LISA Pathfinder
Abstract

LISA Pathfinder (LPF) was a technology pioneering mission designed to test key technologies required for gravitational wave detection in space. In the low frequency regime (milliHertz and below), where space-based gravitational wave observatories will operate, temperature fluctuations play a crucial role since they can couple into the interferometric measurement and the test masses' free-fall accuracy in many ways. A dedicated temperature measurement subsystem, with noise levels in 10  |$\mu$| K Hz−1/2 down to 1 mHz was part of the diagnostics unit onboard LPF. In this paper we report on the temperature measurements throughout mission operations, characterize the thermal environment, estimate transfer functions between different locations, and report temperature stability (and its time evolution) at frequencies as low as 10  |$\mu$| Hz, where typically values around 1 K Hz−1/2 were measured. [ABSTRACT FROM AUTHOR]

Published
2019
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5. In-flight testing of the injection of the LISA Pathfinder test mass into a geodesic.

Author

Bortoluzzi, D., Vignotto, D., Zambotti, A., Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A.M., Danzmann, K., de Deus Silva, M., Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., and Fitzsimons, E.D.

Subjects
*GEODESIC motion, *GEODESICS, *GRAVITATIONAL waves, *SOMATIC sensation
Abstract

LISA Pathfinder is a technology demonstrator space mission, aimed at testing key technologies for detecting gravitational waves in space. The mission is the precursor of LISA, the first space gravitational waves observatory, whose launch is scheduled for 2034. The LISA Pathfinder scientific payload includes two gravitational reference sensors (GRSs), each one containing a test mass (TM), which is the sensing body of the experiment. A mission critical task is to set each TM into a pure geodesic motion, i.e. guaranteeing an extremely low acceleration noise in the sub-Hertz frequency bandwidth. The grabbing positioning and release mechanism (GPRM), responsible for the injection of the TM into a geodesic trajectory, was widely tested on ground, with the limitations imposed by the 1-g environment. The experiments showed that the mechanism, working in its nominal conditions, is capable of releasing the TM into free-fall fulfilling the very strict constraint imposed on the TM residual velocity, in order to allow its capture on behalf of the electrostatic actuation. However, the first in-flight releases produced unexpected residual velocity components, for both the TMs. Moreover, all the residual velocity components were greater than maximum value set by the requirements. The main suspect is that unexpected contacts took place between the TM and the surroundings bodies. As a consequence, ad hoc manual release procedures had to be adopted for the few following injections performed during the nominal mission. These procedures still resulted in non compliant TM states which were captured only after impacts. However, such procedures seem not practicable for LISA, both for the limited repeatability of the system and for the unmanageable time lag of the telemetry/telecommand signals (about 4400 s). For this reason, at the end of the mission, the GPRM was deeply tested in-flight, performing a large number of releases, according to different strategies. The tests were carried out in order to understand the unexpected dynamics and limit its effects on the final injection. Some risk mitigation maneuvers have been tested aimed at minimizing the vibration of the system at the release and improving the alignment between the mechanism and the TM. However, no overall optimal release strategy to be implemented in LISA could be found, because the two GPRMs behaved differently. [ABSTRACT FROM AUTHOR]

Published
2021
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6. Sub-Femto- g Free Fall for Space-Based Gravitational Wave Observatories: LISA Pathfinder Results

Author

R. Gerndt, F. Rivas, Daniele Bortoluzzi, L. Carbone, L. Mendes, Ph. Jetzer, Walter Fichter, Jacob Slutsky, Valerio Ferroni, D. Hoyland, Ulrich Johann, Gudrun Wanner, Miquel Nofrarías, Peter Wass, Juan Ramos-Castro, Pierre Binétruy, Ivan Lloro, Lluis Gesa, G. Auger, C. Trenkel, Stefano Vitale, James Ira Thorpe, Antoine Petiteau, A. Grynagier, Paul McNamara, A. F. García Marín, G. Congedo, Luigi Ferraioli, M. Born, R. Maarschalkerweerd, Karsten Danzmann, V Wand, C. Zanoni, A. Monsky, Ruggero Stanga, Ingo Diepholz, Carlos F. Sopuerta, F. Steier, A. Cesarini, José F. F. Mendes, Tobias Ziegler, N. Korsakova, G. Russano, F. Guzmán, H. Rozemeijer, M. Hewitson, A. Schleicher, B. Johlander, J. P. López-Zaragoza, Michael Perreur-Lloyd, Michele Armano, Daniel Hollington, Daniele Vetrugno, D. Wealthy, B. Kaune, S. Madden, P. Sarra, A. Zambotti, M. Diaz-Aguilo, Christian J. Killow, Peter Zweifel, Davor Mance, D. Shaul, T. J. Sumner, L. Liu, J. Grzymisch, H. Ward, M. Freschi, L. Di Fiore, Oliver Jennrich, Michael Tröbs, H. B. Tu, R. Flatscher, M. Caleno, D. I. Robertson, J. A. Lobo, S. Paczkowski, Ferran Gibert, L. Martin-Polo, P. Prat, I. Harrison, P. Pivato, Ignacio Mateos, C. García Marirrodriga, Mauro Hueller, D. Texier, A. Wittchen, U. Ragnit, Aniello Grado, Heather Audley, J Sanjuán, C. Warren, J. Reiche, B. Rais, Henri Inchauspe, G. Dixon, Eric Plagnol, V. Martín, Domenico Giardini, Daniele Nicolodi, N. Brandt, Nikolaos Karnesis, Giacomo Ciani, Antonella Cavalleri, J. Martino, R. Giusteri, L. Wissel, Rita Dolesi, J. Baird, Massimo Bassan, R. De Rosa, E. D. Fitzsimons, Gerhard Heinzel, W. J. Weber, A. M. Cruise, F. Martin-Porqueras, M. de Deus Silva, N. Dunbar, Catia Grimani, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, UK Space Agency, Science and Technology Facilities Council (STFC), Armano, M., Audley, H., Auger, G., Baird, J. T., Bassan, M., Binetruy, P., Born, M., Bortoluzzi, D., Brandt, N., Caleno, M., Carbone, L., Cavalleri, A., Cesarini, A., Ciani, G., Congedo, G., Cruise, A. M., Danzmann, K., De Deus Silva, M., DE ROSA, Rosario, Diaz Aguiló, M., Di Fiore, L., Diepholz, I., Dixon, G., Dolesi, R., Dunbar, N., Ferraioli, L., Ferroni, V., Fichter, W., Fitzsimons, E. D., Flatscher, R., Freschi, M., García Marín, A. F., García Marirrodriga, C., Gerndt, R., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Guzmán, F., Grado, A., Grimani, C., Grynagier, A., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Johann, U., Johlander, B., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Lobo, J. A., Lloro, I., Liu, L., López Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martín, V., Martin Polo, L., Martino, J., Martin Porqueras, F., Madden, S., Mateos, I., Mcnamara, P. W., Mendes, J., Mendes, L., Monsky, A., Nicolodi, D., Nofrarias, M., Paczkowski, S., Perreur Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Prat, P., Ragnit, U., Raïs, B., Ramos Castro, J., Reiche, J., Robertson, D. I., Rozemeijer, H., Rivas, F., Russano, G., Sanjuán, J., Sarra, P., Schleicher, A., Shaul, D., Slutsky, J., Sopuerta, C. F., Stanga, R., Steier, F., Sumner, T., Texier, D., Thorpe, J. I., Trenkel, C., Tröbs, M., Tu, H. B., Vetrugno, D., Vitale, S., Wand, V., Wanner, G., Ward, H., Warren, C., Wass, P. J., Wealthy, D., Weber, W. J., Wissel, L., Wittchen, A., Zambotti, A., Zanoni, C., Ziegler, T., Zweifel, P., Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
General Physics, Gravitational-wave observatory, detector: performance, Physics, Multidisciplinary, General Physics and Astronomy, Astrophysics, 01 natural sciences, 7. Clean energy, Noise (electronics), 09 Engineering, LISA Pathfinder, Gravitational waves, Acceleration, Physics and Astronomy (all), Square root, Ones gravitacionals, gas, 0103 physical sciences, Orders of magnitude (speed), interferometer: satellite, noise: acceleration, 010303 astronomy & astrophysics, 01 Mathematical Sciences, MISSION, Physics, LISA, Science & Technology, 02 Physical Sciences, density: spectral, 010308 nuclear & particles physics, Gravitational wave, Settore FIS/01 - Fisica Sperimentale, Astrophysics::Instrumentation and Methods for Astrophysics, gravitational radiation, Spectral density, gravitational radiation detector: satellite, detector: sensitivity, gravitation, Physical Sciences, viscosity, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Brownian noise, readout, INTERFEROMETER
Abstract

We report the first results of the LISA Pathfinder in-flight experiment. The results demonstrate that two free-falling reference test masses, such as those needed for a space-based gravitational wave observatory like LISA, can be put in free fall with a relative acceleration noise with a square root of the power spectral density of 5.2 +/- 0.1 fm s(exp -2)/square root of Hz, or (0.54 +/- 0.01) x 10(exp -15) g/square root of Hz, with g the standard gravity, for frequencies between 0.7 and 20 mHz. This value is lower than the LISA Pathfinder requirement by more than a factor 5 and within a factor 1.25 of the requirement for the LISA mission, and is compatible with Brownian noise from viscous damping due to the residual gas surrounding the test masses. Above 60 mHz the acceleration noise is dominated by interferometer displacement readout noise at a level of (34.8 +/- 0.3) fm square root of Hz, about 2 orders of magnitude better than requirements. At f less than or equal to 0.5 mHz we observe a low-frequency tail that stays below 12 fm s(exp -2)/square root of Hz down to 0.1 mHz. This performance would allow for a space-based gravitational wave observatory with a sensitivity close to what was originally foreseen for LISA.

Published
2016

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