DeflectorShield: magnetic shielding for laser communications

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9300-05-M-3002
Agency Tracking Number: F051-200-3351
Amount: $98,611.00
Phase: Phase I
Program: SBIR
Awards Year: 2005
Solicitation Year: 2005
Solicitation Topic Code: AF05-200
Solicitation Number: 2005.1
Small Business Information
P.O. Box 131460, Ann Arbor, MI, 48113
DUNS: 610511334
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 Tim Smith
 Senior Engineer
 (734) 786-1434
 timsmith@umich.edu
Business Contact
 David Morris
Title: Senior Engineer
Phone: (734) 786-1434
Email: morris@edapplications.com
Research Institution
N/A
Abstract
In order to simultaneously characterize and mitigate spacecraft laser communication (lasercom) system performance degradation by electric propulsion (EP) plumes, we propose to develop a magnetic deflector to protect the reflective telescopes typical of lasercom systems from erosion by charge-exchange (CEX) ions. Since beam intensity losses due to absorption and Rayleigh scattering are negligible for the typical EP plume densities, sputtering is the dominant degradation mechanism for on-orbit lasercom. The DeflectorShield uses permanent magnets to set up a magnetic field perpendicular to the optical axis, deflecting CEX ions into the telescope tube before they strike the primary mirror. We will use the magnetostatic code MagNet 6.0? to design a proof-of-concept magnetic deflector, sized to fit a commercially-available reflective telescope. Phase-I will also be used to develop a build, test and evaluation plan for Phase-II. Experiments in Phase-II will compare the optical performance degradation of two telescopes (one protected, one unprotected) at opposite locations in the wings of a Hall thruster plume, permitting the separation of erosion and re-deposition effects. These experiments will permit iterative validation and improvement of the baseline design.

* Information listed above is at the time of submission. *

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