On 6/17/2017 10:48 AM, Sегgi о wrote:

The Parker probe will use a refrigeration system to lower the
temperature of the components of the spacecraft from 1,400 C to room
temperature. This is about the same temperature drop as the
temperature drop from the Sun’s surface to the maximum temperature of
our high temperature ceramics. So it should be possible to do this
temperature drop on the surface of the Sun using our highest
temperature ceramics.


the major constraint is; the limited amount of heat can the probe get
rid of by radiate it out into cold space on the back side. This is only
a few hundred watts. (do the calculation)
[hint http://hyperphysics.phy-astr.gsu.edu...mo/stefan.html ]

this means the solar shield *must be* a wideband optical and heat reflector


Don't you know that directing energy back into the sun could overload it
and cause it to explode? This is science.