Meeting the Grand Challenge of Protecting an Astronaut s Health: Electrostatic Active Space Radiation Shielding for Deep Space Missions
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1 Meeting the Grand Challenge of Protecting an Astronaut s Health: Electrostatic Active Space Radiation Shielding for Deep Space Missions Ram Tripathi NASA Langley Research Center NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
2 Team Ram Tripathi - LaRC H. Schaub - Lead CU Z. Sternovsky L. Stiles P. Anderson C. Seubert N. Zinner J. Mills R. Joshi - Lead ODU F. Farrow H. Qui A. Mishra R. Youngquist - KSC NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
3 Presentation Outline Space Radiation Shielding Overview NIAC Phase I Goals Electrostatic Radiation Shielding Concept Charged Gossamer Structures Concept Description Small-Scale Vacuum Chamber Experiments Larger Structures Power Analysis Charge Deflection Experimental Validation Conclusions NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
4 Space Radiation Shielding Overview Deep space Radiation exposures are very different from LEO Material radiation shielding has matured; has limited or no potential of avoiding continuous radiation exposures; is low earth orbit (LEO) technology Biological uncertainties from long duration radiation exposures are unknown Best strategy is to avoid radiation hitting the spacecraft Magnetic fields have been found to have adverse health effects The best hope is electrostatic active shielding Comprehensive technology; synergistically includes electrostatic, material and hybrid magnetic shielding (only if safer) NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
5 NIAC Phase I Goals Simulate, test and validate an electrostatic Gossamer structure to provide radiation protection Experimentally verify electron deflection efficiency with charged Gossamer structures Study suitable Gossamer shapes to enhance deflection and stiffness Investigate larger charged Gossamer structure Consider power requirements NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
6 Electrostatic Radiation Shielding Concept NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
7 Potential at 70 m! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
8 Charged Gossamer Structures Active radiation shielding requires a light-weight solution Electrostatic deflection requires a large capacitance (i.e. surface) Solution: charged Gossamer structures Electrostatic Inflation of layered conducting membrane structure! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
9 Small-Scale Vacuum Chamber Experiments Vacuum Chamber:!! - No charge flux! - 10cm structure! - External power supply! Illustrates electrostatic inflation of Gossamer Structure! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
10 Large Electrostatically Inflated Structures How fast can a large, spherical electrostatic Gossamer structure be accelerated?! Allowable G s of Acceleration! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
11 Φ( x = ξ, y = ξ, z = ξ) Positive barrier deflects protons Negative barrier deflects electrons H e Damaging high-energy protons kept out of this region Vast quantities of low-energy electrons kept out of this region NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, 2012
12 Complex Power Considerations Nominal solar wind and photo-electron current dominate power evaluation! T = 40eV! n = 10cm -3! The outer negative objects deflect the electrons, and don t reach the inner positive spheres! Electrons create a wake, but don t reach inner positive objects (green)! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
13 Complex Power Considerations Nominal solar wind and photo-electron current dominate power evaluation! T = 40eV! n = 10cm -3! The outer negative objects deflect the electrons, and don t reach the inner positive spheres! Ions are first focused, then scattered, in complex patterns! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
14 Charged Isolated Sphere Power Analysis Low energy solar wind and photo-electron current dominate power requirement!! MeV ions of solar storms and GeV ions of galactic radiation have such low densities to result in minimal power requirements.! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
15 Solar Particle Event Power Analysis Power analysis for 1956 solar particle event (Webber Spectrum) minimal power requirements!!! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
16 GCR Spectrum Power Analysis 1977 solar minimum GCR spectrum power analysis - minimal power requirements!! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
17 Charge Deflection Experimental Verification Coulomb membrane structures with up to 10kV are subjected to an electron flux with up to 5keV in a vacuum chamber to investigate charge deflection, as well as membrane structure stability.! Current is measured through a faraday cup on a moving boom.! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
18 Nominal Charge Flux in chamber (No Structure) Uncharged Structure (Passive Shielding) 4 kv Charged Structure 8 kv Charged Structure NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
19 Plasma Flux and Electrostatic-Mechanic Coupling Observed In the presence of charge flux, interesting coupling between the electrostatically supported membrane and the charge flow have been observed.! The vibrations are on the order of 4Hz, and depend on the flux energy, membrane voltage, and structure shape.! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
20 The Way Forward
21 Conclusions Active radiation shielding employing charged Gossamer structures is feasible and achievable with the existing technology Significant reduction in radiation exposure is achieved with large electrostatic repulsion Significantly helps alleviate biological uncertainties Carefully configured positive and negative components create a charge flux wake effect, i.e. radiation safe zone Future work will need to investigate further to coupling between high energy radiation deflection, Gossamer shapes and sizes, power considerations, and space weather impact. Synergistically include electrostatic, material and hybrid magnetic shielding (only if safer) NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
22 Questions? NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
23 Backup! NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
24 Accomplishments! Experimentally verified electron deflection efficiency with charged Gossamer structures! Experimentally and analytically studied several Gossamer shapes and materials to enhance deflection and stiffness! Identified ~ 5 Hz structural vibrations due to electrostatic inflation and charge flux coupling! Studied power requirements for deep space shielding! 1 journal paper; 5 conference papers; 4 reports! 1 patent NIAC 2012 Spring Symposium, Pasadena, CA, March 27 29, !
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