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LAGRANGE: LAser GRavitational-wave ANtenna at GEo-lunar Lagrange points | | J. W. Conklin
; S. Buchman
; V. Aguero
; A. Alfauwaz
; A. Aljadaan
; M. Almajed
; H. Altwaijry
; T. Al-Saud
; K. Balakrishnan
; R. L. Byer
; K. Bower
; B. Costello
; G. D. Cutler
; D. B. DeBra
; D. M. Faied
; C. Foster
; A. L. Genova
; J. Hanson
; K. Hooper
; E. Hultgren
; B. Jaroux
; A. Klavins
; B. Lantz
; J. A. Lipa
; A. Palmer
; B. Plante
; H. S. Sanchez
; S. Saraf
; D. Schaechter
; T. Sherrill
; E. Smith
; K.-L. Shu
; D. Tenerelli
; R. Vanbezooijen
; G. Vasudevan
; S. D. Williams
; S. P. Worden
; J. Zhou
; A. Zoellner
; | | Date: |
22 Nov 2011 | | Abstract: | We describe a new space gravitational wave observatory design called LAGRANGE
that maintains all important LISA science at about half the cost and with
reduced technical risk. It consists of three drag-free spacecraft in the most
stable geocentric formation, the Earth-Moon L3, L4, and L5 Lagrange points.
Fixed antennas allow continuous contact with the Earth, solving the problem of
communications bandwidth and latency. A 70 mm diameter AuPt sphere with a 35 mm
gap to its enclosure serves as a single inertial reference per spacecraft,
which is operated in "true" drag-free mode (no test mass forcing). This is the
core of the Modular Gravitational Reference Sensor whose other advantages are:
a simple caging design based on the DISCOS 1972 drag-free mission, an all
optical read-out with pm fine and nm coarse sensors, and the extensive
technology heritage from the Honeywell gyroscopes, and the DISCOS and Gravity
Probe B drag-free sensors. An Interferometric Measurement System, designed with
reflective optics and a highly stabilized frequency standard, performs the
inter-test mass ranging and requires a single optical bench with one laser per
spacecraft. Two 20 cm diameter telescopes per spacecraft, each with in-field
pointing, incorporate novel technology developed for advanced optical systems
by Lockheed Martin, who also designed the spacecraft based on a multi-flight
proven bus structure. Additional technological advancements include the
drag-free propulsion, thermal control, charge management systems, and
materials. LAGRANGE sub-systems are designed to be scalable and modular, making
them interchangeable with those of LISA or other gravitational science
missions. We plan to space qualify critical technologies on small and nano
satellite flights, with the first launch (UV-LED Sat) in 2013. | | Source: | arXiv, 1111.5264 | | Services: | Forum | Review | PDF | Favorites | |
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