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Proceedings Paper

Technology development for the Solar Probe Plus Faraday Cup
Author(s): Mark D. Freeman; Justin Kasper; Anthony W. Case; Peter Daigneau; Thomas Gauron; Jay Bookbinder; Étienne Brodu; Marianne Balat-Pichelin; Kenneth Wright
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Paper Abstract

The upcoming Solar Probe Plus (SPP) mission requires novel approaches for in-situ plasma instrument design. SPP’s Solar Probe Cup (SPC) instrument will, as part of the Solar Wind Electrons, Alphas, and Protons (SWEAP) instrument suite, operate over an enormous range of temperatures, yet must still accurately measure currents below 1 pico-amp, and with modest power requirements. This paper discusses some of the key technology development aspects of the SPC, a Faraday Cup and one of the few instruments on SPP that is directly exposed to the solar disk, where at closest approach to the Sun (less than 10 solar radii (Rs) from the center of the Sun) the intensity is greater than 475 earth-suns. These challenges range from materials characterization at temperatures in excess of 1400°C to thermal modeling of the behavior of the materials and their interactions at these temperatures. We discuss the trades that have resulted in the material selection for the current design of the Faraday Cup. Specific challenges include the material selection and mechanical design of insulators, particularly for the high-voltage (up to 8 kV) grid and coaxial supply line, and thermo-optical techniques to minimize temperatures in the SPC, with the specific intent of demonstrating Technology Readiness Level 6 by the end of 2013.

Paper Details

Date Published: 26 September 2013
PDF: 12 pages
Proc. SPIE 8862, Solar Physics and Space Weather Instrumentation V, 88620K (26 September 2013); doi: 10.1117/12.2024983
Show Author Affiliations
Mark D. Freeman, Smithsonian Astrophysical Observatory (United States)
Justin Kasper, Smithsonian Astrophysical Observatory (United States)
Anthony W. Case, Smithsonian Astrophysical Observatory (United States)
Peter Daigneau, Smithsonian Astrophysical Observatory (United States)
Thomas Gauron, Smithsonian Astrophysical Observatory (United States)
Jay Bookbinder, Smithsonian Astrophysical Observatory (United States)
Étienne Brodu, Smithsonian Astrophysical Observatory (United States)
Lab. Procédés, Matériaux et Energie Solaire, CNRS (France)
Marianne Balat-Pichelin, Lab. Procédés, Matériaux et Energie Solaire, CNRS (France)
Kenneth Wright, CSPAR, The Univ. of Alabama in Huntsville (United States)

Published in SPIE Proceedings Vol. 8862:
Solar Physics and Space Weather Instrumentation V
Silvano Fineschi; Judy Fennelly, Editor(s)

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