Availability of Uncoated Carbon-Carbon Composites,
- V. Vaughn
- NASA Langley Research Center, SS229,
A mission close to the sun is only pcrssiblc if new spacecraft tcchnolofiies can be developed and incorporated into a stateof-the-art spacecraft concept. The perihelion goal of 4 solar radii requires a shielded spacecraft that can tolerate the 3000 suns solar flux while maintaining the electronics components at room temperature. in additicrll, the shield surface shoLIlct sublimate at a rate of less than 3 mg/s at perihelion. Many shield c(mfiguration designs have been studied and the most promising is a parabolic shape that functions as both a shield and a large high gain antenna. 3’hcI shielci material chosen for this design is a carbon-carbon material with highly emissivc surface properties. A mission requirement for a high telecommunications power sterns from the expected interference when attempting to transmit data through the solar corona. It is expected that the large carbon-carbon shield /anterma will have a large power gain even at high temperatures and will return adequate telenietry at the X-band radio frequency chosen for the Solar Probe mission. Othcr key technology needs include a non-nuclear power subsystem that can function in the extreme environments of the mission from Earth to Jupiter and ,pmward to a 4 solar radii perihelion.