MG14 - Talk detail |
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Participant |
Ferroni, Valerio | |||||||
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Institution |
University of Trento - Via Sommarive 14 - Trento - Trentino Alto Adige - Italy | |||||||
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Session |
GW3 |
Accepted |
Yes |
Order |
8 |
Time |
17:35 | 15' |
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Talk |
Oral abstract |
Title |
Nulling the gravitational imbalance between the LISA Pathfinder Test masses | |||||
| Coauthors | Desiderio, Daniela | |||||||
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Abstract |
LISA Pathfinder launches on fall 2015 to Sun-Earth L1 and aims to flight two proof-masses in a geodetic motion to the unprecedented femto − g/Hz^1/2 of relative residual acceleration noise, in the millihertz band. The satellite was built to have a gravitational field fulfilling rigid constraints to bound the noise on the two proof-masses: the mutual grav- itational force between the satellite and the proof-masses was estimated and balanced to nearly ”zero” with sub-nano-g accuracy, by a control protocol based on measurements of the position and the mass of all parts that constitute the satellite, and on a finite element calculation tool. In this talk we proceed from these constraints to the estimation procedure of the gravitational field, and the control protocol. Then we describe how the residual gravitational attraction will be measured and compensated, if needed, in-orbit. In conclusion, we discuss the results obtained in the perspective of eLISA mission. |
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Pdf file |
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