Technology development for the Solar Probe Plus Faraday Cup

Mark D. Freeman; Justin Kasper; Anthony W. Case; Peter Daigneau; Thomas Gauron; Jay Bookbinder; Étienne Brodu; Marianne Balat-Pichelin; Kenneth Wright

doi:10.1117/12.2024983

26 September 2013 Technology development for the Solar Probe Plus Faraday Cup

Mark D. Freeman, Justin Kasper, Anthony W. Case, Peter Daigneau, Thomas Gauron, Jay Bookbinder, Étienne Brodu, Marianne Balat-Pichelin, Kenneth Wright

Author Affiliations +

Proceedings Volume 8862, Solar Physics and Space Weather Instrumentation V; 88620K (2013) https://doi.org/10.1117/12.2024983
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

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 (R_s) 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.

Citation Download Citation

Mark D. Freeman, Justin Kasper, Anthony W. Case, Peter Daigneau, Thomas Gauron, Jay Bookbinder, Étienne Brodu, Marianne Balat-Pichelin, and Kenneth Wright "Technology development for the Solar Probe Plus Faraday Cup", Proc. SPIE 8862, Solar Physics and Space Weather Instrumentation V, 88620K (26 September 2013); https://doi.org/10.1117/12.2024983

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