DESIGN AND DEVELOPMENT OF A HYPER-THERMAL ATOMIC OXYGEN WIND TUNNEL FACILITY

A hyper-thermal orbital aerodynamics test facility is described. The Rarefied Orbital Aerodynamics Research facility (ROAR) is a dedicated apparatus designed to simulate the atmospheric flow in very low Earth orbits (VLEO) to investigate the impact different material properties have on gas-surface interactions, and determine the aerodynamic properties of materials from the reemitted gas distribution. The main characteristics observed in VLEO to be reproduced are the free molecular flow regime and the flux of oxygen atoms at orbital velocities impinging on the spacecraft surface. This is accomplished by combining an ultra-high vacuum system with a hyper-thermal oxygen atoms generator. Materials performance will be assessed via a scattering experiment in which an atomic oxygen beam is incident on the surface of a test sample and the scattered species are recorded by mass spectrometers. The design of the experiment is discussed, from the specification of the vacuum components to the generation of oxygen atoms and their detection.

[1]  F. O. Goodman.  Three-dimensional hard spheres theory of scattering of gas atoms from a solid surface I. Limit of large incident speed , 1967 .

[2]  R. Haefer.  Vacuum and cryotechniques in space research , 1972 .

[3]  H. Nuss.  Vacuum system for a space simulation facility , 1988 .

[4]  R. Outlaw,et al.  Development of a hyperthermal oxygen‐atom generator , 1992 .

[5]  J. Weaver,et al.  Performance characteristics of a hyperthermal oxygen atom generator , 1994 .

[6]  R. Outlaw,et al.  Small ultrahigh vacuum compatible hyperthermal oxygen atom generator , 1994 .

[7]  Kenneth Moe,et al.  Improved Satellite Drag Coefficient Calculations from Orbital Measurements of Energy Accommodation , 1998 .

[8]  Jacob I. Kleiman,et al.  ATOMIC OXYGEN BEAM SO URCES: A CRITICAL OVERVIEW , 2003 .

[9]  B. Banks,et al.  Atomic Oxygen Effects on Spacecraft Materials , 2003 .

[10]  David G. Fearn,et al.  Economical remote sensing from a low altitude with continuous drag compensation , 2005 .

[11]  Bruce A. Banks,et al.  Low Earth Orbital Atomic Oxygen Interactions With Spacecraft Materials (Invited Paper) , 2013 .

[12]  B. Bowman,et al.  Drag Coefficient Variability at 175-500 km from the Orbit Decay Analyses of Spheres , 2006 .

[13]  D. Waters,et al.  The Atomic Oxygen Erosion Depth and Cone Height of Various Materials at Hyperthermal Energy , 2007 .

[14]  F. Collins.  Recent advances to enhance low Earth orbit space simulation , 2008 .

[15]  I. Gouzman,et al.  rf plasma system as an atomic oxygen exposure facility. , 2008, The Review of scientific instruments.

[16]  Bruce A. Banks,et al.  Lessons Learned from Atomic Oxygen Interaction with Spacecraft Materials in Low Earth Orbit , 2008 .

[17]  R. Kersevan,et al.  Introduction to MOLFLOW+: New graphical processing unit-based Monte Carlo code for simulating molecular flows and for calculating angular coefficients in the compute unified device architecture environment , 2009 .

[18]  Eric K. Sutton,et al.  Normalized Force Coefficients for Satellites with Elongated Shapes , 2009 .

[19]  V. N. Chernik,et al.  Ground‐based Atomic Oxygen Tests of Pristine and Protected polymeric Threads , 2009 .

[20]  Bruce A. Banks,et al.  Ground‐Laboratory to In‐Space Atomic Oxygen Correlation for the PEACE Polymers , 2009 .

[21]  Graham T. Roberts,et al.  LEO Atomic Oxygen Measurements: Experiment Design and Preliminary Results , 2009 .

[22]  M. Tagawa,et al.  Energy Dependence of Hyperthermal Oxygen Atom Erosion of a Fluorocarbon Polymer: Relevance to Space Environmental Effects , 2010 .

[23]  James R. Wertz,et al.  Moderately Elliptical Very Low Orbits (MEVLOs) as a Long-Term Solution to Orbital Debris , 2012 .

[24]  B. Banks,et al.  Misse Scattered Atomic Oxygen Characterization Experiment , 2013 .

[25]  Zhou Hao,et al.  Very Low Earth Orbit mission concepts for Earth Observation: Benefits and challenges. , 2014 .

[26]  Josef Koller,et al.  Drag Coefficient Model Using the Cercignani–Lampis–Lord Gas–Surface Interaction Model , 2014 .

[27]  Liang Liu,et al.  Development of an ultra-high vacuum system for space cold atom clock , 2015 .

[28]  Stefanos Fasoulas,et al.  Air-Intake Design Investigation for an Air-Breathing Electric Propulsion System IEPC-2015-90524 / ISTS-2015 , 2015 .

[29]  Timothy K. Minton,et al.  Inelastic and Reactive Scattering Dynamics of Hyperthermal O and O2 on Hot Vitreous Carbon Surfaces , 2015 .

[30]  Jonathan Becedas,et al.  DISCOVERER: Radical Redesign of Earth Observation Satellites for Sustained Operation at Significantly Lower Altitudes , 2017 .

[31]  S. Haigh,et al.  SOAR - Satellite for Orbital Aerodynamics Research , 2018 .

[32]  T. Binder,et al.  System analysis and test-bed for an atmosphere-breathing electric propulsion system using an inductive plasma thruster , 2018, Acta Astronautica.