eLISA Telescope In-field Pointing and Scattered Light Study

11th International LISA Symposium

Livas, J.^1 ; Sankar, S.^1,2 ; West, G.^1 ; Seals, L.^1 ; Howard, J.^1 ; Fitzsimons, E.^3

NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt

MD

20771, United States^1

CRESST/USRA, Greenbelt

MD

20771, United States^2

UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh

EH9 3HJ, United Kingdom^3

关键词: Alternative solutions;    Gravitational reference sensors;    Line of Sight;    Optical assemblies;    Optical phase;    Orbital motions;    Single-mode optical fiber;    Steering mirrors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/840/1/012015/pdf
DOI  :  10.1088/1742-6596/840/1/012015

来源: IOP

【 摘 要 】

The orbital motion of the three spacecraft that make up the eLISA Observatory constellation causes long-arm line of sight variations of approximately ± one degree over the course of a year. The baseline solution is to package the telescope, the optical bench, and the gravitational reference sensor (GRS) into an optical assembly at each end of the measurement arm, and then to articulate the assembly. An optical phase reference is exchanged between the moving optical benches with a single mode optical fiber ("backlink" fiber). An alternative solution, referred to as in-field pointing, embeds a steering mirror into the optical design, fixing the optical benches and eliminating the backlink fiber, but requiring the additional complication of a two-stage optical design for the telescope. We examine the impact of an in-field pointing design on the scattered light performance.