[TexasGator]

In inertial-confinement fusion, the time involved is a few tenths of a billionth of a second and the density of the plasma has to reach 1031 nuclei per cubic meter—many times more dense than lead.

https://www.sciencedirect.com/topics/mathematics/inertial-confinement

[Steely Tom]

What's the total energy release in joules?

I'm assuming you meant to type 10³¹ nuclei per cubic meter.

[Steely Tom]

Also just a little on-line investigation reveals that the maximum densities they get are about 7x10²⁹ nuclei per cubic meter. Still high, but you overstated the situation by an amount in excess of an order of magnitude.