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Why is X-ray cooling a problem in the plasma focus device and not in other fusion experiments as the tokomak?
It’s that we are using a different fuel–hydrogen-boron, not Deuterium-tritium. X-ray emission is proportional to the square of the atomic charge, so boron,with 5 charges causes 25 times as much x-ray radiation as D or T with one charge each.
Note to King Kong, your post in this category has been moved to: https://focusfusion.org/index.php/forums/viewthread/88/
and explains how the forum works a bit.
And the initial post you enquired about is here: https://focusfusion.org/index.php/forums/viewthread/75/