Title:
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Charge-induced force noise on free-falling test masses: results from LISA pathfinder
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Author:
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Armano, M.; Audley, H.; Auger, G.; Baird, J.; Binetruy, P.; Ramos Castro, Juan José
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica |
Abstract:
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We report on electrostatic measurements made on board the European Space Agency mission LISA Pathfinder. Detailed measurements of the charge-induced electrostatic forces exerted on free-falling test masses (TMs) inside the capacitive gravitational reference sensor are the first made in a relevant environment for a space-based gravitational wave detector. Employing a combination of charge control and electric-field compensation, we show that the level of charge-induced acceleration noise on a single TM can be maintained at a level close to 1.0¿¿fm¿s-2¿Hz-1/2 across the 0.1–100 mHz frequency band that is crucial to an observatory such as the Laser Interferometer Space Antenna (LISA). Using dedicated measurements that detect these effects in the differential acceleration between the two test masses, we resolve the stochastic nature of the TM charge buildup due to interplanetary cosmic rays and the TM charge-to-force coupling through stray electric fields in the sensor. All our measurements are in good agreement with predictions based on a relatively simple electrostatic model of the LISA Pathfinder instrument. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Física::Astronomia i astrofísica -Gravitational waves -Electrostatics -Laser interferometers -Capacitive sensors -Cosmic ray measurement -Cosmology -Electric fields -Electrostatic force -Electrostatics -Frequency bands -Gravitation -Gravity waves -Interferometers -Interplanetary flight -Laser interferometry -Stochastic systems -Dedicated measurements -Differential accelerations -Electrostatic measurements -Electrostatic modeling -European Space Agency -Gravitational reference sensors -Gravitational wave detectors -Laser interferometer space antenna -Ones gravitacionals -Electrostàtica -Interferometria làser |
Rights:
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Document type:
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Article - Published version Article |
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