"Coconut" + fusion thermo nuclear = yummy soup

[BravoV]

Although not as popular as LHC (Large Hadron Collider) project, personally I do follow enthusiastically the ITER project since the beginning.
For those who don't know what "ITER" is (International Thermonuclear Experimental Reactor) -> http://www.iter.org/faq
 
Its quite amazing that simple thing as a "coconut" plays a big role in fusion thermonuclear chamber. 

The most efficient coating material for the cryopanels that keep the vacuum in the ITER Tokamak clean: coconut-shell charcoal.


Source -> http://www.iter.org/sci/beyonditer

[TerraHertz]

Well that was frustrating. WHY is charcoal beneficial as a cryo-panel coating, and why is coconut shell charcoal (from 2002 no less) the best kind?

Not to go into the deeper issues of the viability of a fusion machine topology in which there's a fundamental no-win engineering problem - which should be closer to the plasma, the shielding water-heating layer, or the superconductor coils?

Plus the other little problem - the (non)availability of He3.
http://ihp-lx2.ethz.ch/energy21/fusionillusions.pdf
Fusion Illusions: Dangerous illusions of commercial energy production from deuterium-tritium fusion.

[BravoV]

Well that was frustrating. WHY is charcoal beneficial as a cryo-panel coating, and why is coconut shell charcoal (from 2002 no less) the best kind?

Though I don't have any clue about this thing, but why not ? 

Any scientifically proven reasons why you're so frustrated that this coconut is not the best or the right coating material for the "thermonuclear" grade plasma soup chamber ?