SEL2 servicing: increased science return via on-orbit propellant replenishment

Reed, Benjamin B.; DeWeese, Keith; Kienlen, Michael; Aranyos, Thomas J.; Pellegrino, Joseph; Bacon, Charles; Qureshi, Atif

doi:10.1117/12.2231290

Cited by 2 publications

(1 citation statement)

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“…Given the wealth of material available 32 , we only mention two initiatives iv of the US Government: the NASA Restore-L program 33 for servicing of low altitude satellites (with spinoff to deep space servicing 34 ) and the DARPA Robotic Servicing of Geosynchronous Satellites (RSGS) 35 . An early artist's concept of Restore-L is shown in Figure 13.…”

Section: Current Active Developmentmentioning

confidence: 99%

An evolvable space telescope configured for NASA's Habex mission: the initial stage of LUVOIR

Lillie¹,

MacEwen

Polidan³

et al. 2017

UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII

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Previous papers have described our concept for a large telescope that would be assembled in space in several stages (in different configurations) over a period of fifteen to 20 years. Spreading the telescope development, launch and operations cost over 20 years would minimize the impact on NASA's annual budget and drastically shorten the time between program start and "first light" for this space observatory. The first Stage of this Evolvable Space Telescope (EST) would consist of an instrument module located at the prime focus of three 4-meter hexagonal mirrors arranged in a semi-circle to form one-half of a 12-m segmented mirror. After several years three additional 4-m mirrors would be added to create a 12-m filled aperture. Later, twelve more 4-m mirrors will be added to this Stage 2 telescope to create a 20-m filled aperture space telescope. At each stage the telescope would have an unparalleled capability for UVOIR observations, and the results of these observations will guide the evolution of the telescope and its instruments.In this paper we describe our design concept for an initial configuration of our Evolvable Space Telescope that can meet the requirements of the 4-m version of the HabEx spacecraft currently under consideration by NASA's Habitable Exoplanet Science and Technology Definition Team. This "Stage Zero" configuration will have only one 4-m mirror segment with the same 30-m focal length and a prime focus coronagraph with normal incidence optics to minimize polarization effects. After assembly and checkout in cis-lunar space, the telescope would transfer to a Sun-Earth L2 halo orbit and obtain high sensitivity, high resolution, high contrast UVOIR observations that address the scientific objectives of the Habitable-Exoplanet Imaging Missions.

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Section: Current Active Developmentmentioning

confidence: 99%

An evolvable space telescope configured for NASA's Habex mission: the initial stage of LUVOIR

Lillie¹,

MacEwen

Polidan³

et al. 2017

UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII

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Analysis of Xenon Flashing during On-orbit Refueling Process

Jiang¹,

Huang²,

Wu³

2019

dtcse

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On-orbit Refueling of liquid xenon can prolong life of the electric propulsion system. Subcooled liquid xenon easily evaporates to form two-phase flow owing to reduction in pressure against continuing refueling. This paper investigates the steady flashing flow characteristics of xenon during the process of on-orbit refueling based on one-dimensional homogenous equilibrium model. Two phases are seen homogeneously without the discrepancy of pressure, temperature and velocity between liquid and vapor. One-dimensional fluid equations are discrete by the finite difference method. Distributions of pressure, dryness, void fraction, temperature and velocity are calculated in the condition of given inlet pressure, subcooling and mass flux. Effect of heat flux on two-phase flow is obtained. The results can help us better understand two-phase flow characteristics of xenon during the process of on-orbit refueling and design on-orbit refueling system of liquid xenon.

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SEL2 servicing: increased science return via on-orbit propellant replenishment

Cited by 2 publications

References 1 publication

An evolvable space telescope configured for NASA's Habex mission: the initial stage of LUVOIR

An evolvable space telescope configured for NASA's Habex mission: the initial stage of LUVOIR

Analysis of Xenon Flashing during On-orbit Refueling Process

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