C. J. Killow
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View article: Magnetic-Induced Force Noise in LISA Pathfinder Free-Falling Test Masses
Magnetic-Induced Force Noise in LISA Pathfinder Free-Falling Test Masses Open
LISA Pathfinder was a mission designed to test key technologies required for gravitational wave detection in space. Magnetically driven forces play a key role in the instrument sensitivity in the low-frequency regime, which corresponds to …
View article: Precision measurements of the magnetic parameters of LISA Pathfinder test masses
Precision measurements of the magnetic parameters of LISA Pathfinder test masses Open
A precise characterization of the magnetic properties of LISA Pathfinder free falling test-masses is of special interest for future gravitational wave observatory in space. Magnetic forces have an important impact on the instrument sensiti…
View article: Tilt-to-length coupling in LISA Pathfinder: Long-term stability
Tilt-to-length coupling in LISA Pathfinder: Long-term stability Open
The tilt-to-length coupling during the LISA Pathfinder mission has been numerically and analytically modeled for particular time spans. In this work, we investigate the long-term stability of the coupling coefficients of this noise. We sho…
View article: In-depth analysis of LISA Pathfinder performance results: Time evolution, noise projection, physical models, and implications for LISA
In-depth analysis of LISA Pathfinder performance results: Time evolution, noise projection, physical models, and implications for LISA Open
We present an in-depth analysis of the LISA Pathfinder differential acceleration performance over the entire course of its science operations, spanning approximately 500 days. We find: (1) The evolution of the Brownian noise that dominates…
View article: Tilt-to-length coupling in LISA Pathfinder: long-term stability
Tilt-to-length coupling in LISA Pathfinder: long-term stability Open
The tilt-to-length coupling during the LISA Pathfinder mission has been\nnumerically and analytically modeled for particular timespans. In this work, we\ninvestigate the long-term stability of the coupling coefficients of this noise.\nWe s…
View article: Precision measurements of the magnetic parameters of LISA Pathfinder test masses
Precision measurements of the magnetic parameters of LISA Pathfinder test masses Open
A precise characterization of the magnetic properties of LISA Pathfinder free falling test-masses is of special interest for future gravitational wave observatory in space. Magnetic forces have an important impact on the instrument sensiti…
View article: Nano-Newton electrostatic force actuators for femto-Newton-sensitive measurements: System performance test in the LISA Pathfinder mission
Nano-Newton electrostatic force actuators for femto-Newton-sensitive measurements: System performance test in the LISA Pathfinder mission Open
Electrostatic force actuation is a key component of the system of geodesic reference test masses (TM) for the LISA orbiting gravitational wave observatory and in particular for performance at low frequencies, below 1 mHz, where the observa…
View article: Sensor noise in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>L</mml:mi><mml:mi>I</mml:mi><mml:mi>S</mml:mi><mml:mi>A</mml:mi></mml:mrow></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>P</mml:mi><mml:mi>a</mml:mi><mml:mi>t</mml:mi><mml:mi>h</mml:mi><mml:mi>f</mml:mi><mml:mi>i</mml:mi><mml:mi>n</mml:mi><mml:mi>d</mml:mi><mml:mi>e</mml:mi><mml:mi>r</mml:mi></mml:mrow></mml:math>: Laser frequency noise and its coupling to the optical test mass readout
Sensor noise in : Laser frequency noise and its coupling to the optical test mass readout Open
The (LPF) mission successfully demonstrated the feasibility of the technology needed for the future space borne gravitational wave observatory LISA. A key subsystem under study was the laser interferometer, which measured the changes in re…
View article: NanoNewton electrostatic force actuators for femtoNewton-sensitive measurements: system performance test in the LISA Pathfinder mission
NanoNewton electrostatic force actuators for femtoNewton-sensitive measurements: system performance test in the LISA Pathfinder mission Open
Electrostatic force actuation is a key component of the system of geodesic reference test masses (TM) for the LISA orbiting gravitational wave observatory and in particular for performance at low frequencies, below 1 mHz, where the observa…
View article: Tilt-to-length coupling in LISA Pathfinder: A data analysis
Tilt-to-length coupling in LISA Pathfinder: A data analysis Open
We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system’s alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass…
View article: Charging of free-falling test masses in orbit due to cosmic rays: Results from <i>LISA Pathfinder</i>
Charging of free-falling test masses in orbit due to cosmic rays: Results from <i>LISA Pathfinder</i> Open
A comprehensive summary of the measurements made to characterize test-mass charging due to the space environment during the LISA Pathfinder mission is presented. Measurements of the residual charge of the test mass after release by the gra…
View article: Sensor noise in <i>LISA Pathfinder</i>: An extensive in-flight review of the angular and longitudinal interferometric measurement system
Sensor noise in <i>LISA Pathfinder</i>: An extensive in-flight review of the angular and longitudinal interferometric measurement system Open
In a previous article [1], we have reported on the first subpicometer interferometer flown in space as part of ESA’s LISA Pathfinder mission, and have shown the residual sensor noise to be on the level of 32.0+2.4?1.7 fm/?Hz. This review p…
View article: Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin
Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin Open
We present an in depth analysis of the transient events, or glitches, detected at a rate of about one per day in the differential acceleration data of LISA Pathfinder. We show that these glitches fall in two rather distinct categories: fas…
View article: Sensor Noise in <i>LISA Pathfinder</i>: In-Flight Performance of the Optical Test Mass Readout
Sensor Noise in <i>LISA Pathfinder</i>: In-Flight Performance of the Optical Test Mass Readout Open
We report on the first subpicometer interferometer flown in space. It was part of ESA's Laser Interferometer Space Antenna (LISA) Pathfinder mission and performed the fundamental measurement of the positional and angular motion of two free…
View article: In-flight testing of the injection of the LISA Pathfinder test mass into a geodesic
In-flight testing of the injection of the LISA Pathfinder test mass into a geodesic Open
View article: Analysis of the accuracy of actuation electronics in the laser interferometer space antenna pathfinder
Analysis of the accuracy of actuation electronics in the laser interferometer space antenna pathfinder Open
The Laser Interferometer Space Antenna Pathfinder (LPF) main observable, labeled Δg, is the differential force per unit mass acting on the two test masses under free fall conditions after the contribution of all non-gravitational forces ha…
View article: Spacecraft and interplanetary contributions to the magnetic environment on-board LISA Pathfinder
Spacecraft and interplanetary contributions to the magnetic environment on-board LISA Pathfinder Open
LISA Pathfinder (LPF) has been a space-based mission designed to test new technologies that will be required for a gravitational wave observatory in space. Magnetically driven forces play a key role in the instrument sensitivity in the low…
View article: LISA Pathfinder
LISA Pathfinder Open
Since the 2017 Nobel Prize in Physics was awarded for the observation of gravitational waves, it is fair to say that the epoch of gravitational wave astronomy (GWs) has begun. However, a number of interesting sources of GWs can only be obs…
View article: Optical Suppression of Tilt-to-Length Coupling in the LISA Long-Arm Interferometer
Optical Suppression of Tilt-to-Length Coupling in the LISA Long-Arm Interferometer Open
The arm length and the isolation in space enable the Laser Interferometer Space Antenna (LISA) to probe for signals unattainable on the ground, opening a window to the subhertz gravitational-wave universe. The coupling of unavoidable angul…
View article: Novel methods to measure the gravitational constant in space
Novel methods to measure the gravitational constant in space Open
We present two novel methods, tested by LISA Pathfinder, to measure the gravitational constant G for the first time in space. Experiment 1 uses electrostatic suspension forces to measure a change in acceleration of a test mass due to a dis…
View article: Micrometeoroid Events in LISA Pathfinder
Micrometeoroid Events in LISA Pathfinder Open
The zodiacal dust complex, a population of dust and small particles that pervades the solar system, provides important insight into the formation and dynamics of planets, comets, asteroids, and other bodies. We present a new set of data ob…
View article: LISA Pathfinder Performance Confirmed in an Open-Loop Configuration: Results from the Free-Fall Actuation Mode
LISA Pathfinder Performance Confirmed in an Open-Loop Configuration: Results from the Free-Fall Actuation Mode Open
We report on the results of the LISA Pathfinder (LPF) free-fall mode experiment, in which the control force needed to compensate the quasistatic differential force acting on two test masses is applied intermittently as a series of "impulse…
View article: An automated system for hydroxide catalysis bonding of precision-aligned optical systems
An automated system for hydroxide catalysis bonding of precision-aligned optical systems Open
Precision-aligned, robust, ultra-stable optical assemblies are required in an increasing number of space-based applications such as fundamental science, metrology and geodesy. Hydroxide catalysis bonding is a proven, glue-free, technology …
View article: LISA Pathfinder micronewton cold gas thrusters: In-flight characterization
LISA Pathfinder micronewton cold gas thrusters: In-flight characterization Open
The LISA Pathfinder (LPF) mission has demonstrated the ability to limit and measure the fluctuations in acceleration between two free falling test masses down to sub-femto-g levels. One of the key elements to achieve such a level of residu…
View article: LISA Pathfinder platform stability and drag-free performance
LISA Pathfinder platform stability and drag-free performance Open
The science operations of the LISA Pathfinder mission have demonstrated the feasibility of sub-femto-g free fall of macroscopic test masses necessary to build a gravitational wave observatory in space such as LISA. While the main focus of …
View article: Temperature stability in the sub-milliHertz band with LISA Pathfinder
Temperature stability in the sub-milliHertz band with LISA Pathfinder Open
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 observ…
View article: LISA Pathfinder
LISA Pathfinder Open
Since the 2017 Nobel Prize in Physics was awarded for the observation of gravitational waves, it is fair to say that the epoch of gravitational wave astronomy (GWs) has begun. However, a number of interesting sources of GWs can only be obs…
View article: Forbush decreases and < 2-day GCR flux non-recurrent variations studied with LISA Pathfinder
Forbush decreases and < 2-day GCR flux non-recurrent variations studied with LISA Pathfinder Open
Non-recurrent short term variations of the galactic cosmic-ray (GCR) flux above 70 MeV n$^{-1}$ were observed between 2016 February 18 and 2017 July 3 aboard the European Space Agency LISA Pathfinder (LPF) mission orbiting around the Lagra…
View article: Automated precision alignment of optical components for hydroxide catalysis bonding
Automated precision alignment of optical components for hydroxide catalysis bonding Open
We describe an interferometric system that can measure the alignment and separation of a polished face of a optical component and an adjacent polished surface. Accuracies achieved are ∼ 1μrad for the relative angles in two orthogonal direc…
View article: Precision charge control for isolated free-falling test masses: LISA pathfinder results
Precision charge control for isolated free-falling test masses: LISA pathfinder results Open
The LISA Pathfinder charge management device was responsible for neutralising\nthe cosmic ray induced electric charge that inevitably accumulated on the\nfree-falling test masses at the heart of the experiment. We present\nmeasurements mad…