In reply to  Bob Higgins's message of Thu, 12 Jul 2018 11:43:11 -0600:
>radioactive waste (admittedly shorter half life).  Also what is being
>turned into waste and having to be replaced will be expensive machinery.
>The energetic neutrons will make hot fusion energy expensive.

Use carbon for the inner wall. It is relatively cheap, neutron addition to C12
turns it into C13 which is stable, it can withstand high temperatures, and will
act as a neutron moderator, slowing the neutrons so that they may be more easily
captured by the next Li layer needed to produce T.
An alternative is Be which will act as a neutron multiplier, thus making the
production of T easier.

Robin van Spaandonk

local asymmetry = temporary success

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