Abstract
European Space Agency in the frame of Cosmic Vision 2015-2025 program [ 1 ]. It is a cosmology mission whose prime objective is to study the geometry and the nature of the dark matter and the dark energy with unprecedented accuracy.The spacecraft will be launched in 2020 by a Soyuz launcher, to perform a six-year survey of the extragalactic sky from a large-amplitude orbit around Lagrange point L2 of the Sun-Earth system.This paper outlines the Euclid Electrical Power Subsystem (EPS) design, providing a description of the major design drivers and resulting configuration, with a view to highlight aspects that could be considered for future designs.
Highlights
The eclipsefree characteristics of the Euclid mission would allow avoiding the use of a Battery Charge and Discharge Regulator (BCDR) and the bus maintained regulated by the Battery, under the condition that spacecraft peak power consumption is always lower than the Solar Array (SA) power
SpaceTech GmbH (DE) is responsible for the Sunshield and Solar Array (SSH) subsystem, with the PhotoVoltaic Assembly (PVA) made by Leonardo (IT), the Solar Panels and Support Structure manufactured by RUAG (CH) and the Thermal Control Hardware manufactured by HPS Ltd. (PT)
In addition of electrical, thermal and mechanical analysis performed, Saft is manufacturing two battery models: - one Structural and Thermal Model (STM) dedicated to simulate thermally the battery dissipation during different phases, by the use of specific heater bands. This battery is mechanically representative of Flight Model (FM); - one Engineering Qualification Model (EQM) which aims to qualify the battery to Euclid requirements
Summary
The spacecraft will carry two instruments for spectroscopy, imaging and photometry: NISP (Near Infrared Spectro Photometer) and VIS (Visible Instrument); a 1.2 m mirror telescope will focus the incoming images on the focal plane units of these instruments The performance of this survey requires an extreme pointing stability associated to the ability to move from one target to the in few tens of seconds, several thousand of times during the mission without degradation. High stability is requested to the structural materials and the temperatures have to be controlled carefully This constraints had to be taken into account in the EPS architecture, driving the selection of the Sunshield and solar array characteristics and imposing a high stability of the heater power distribution. Thales Alenia Space Italia leads the Euclid industrial team and it is in charge of SVM design, including the electrical power supply chain
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