Doesn't the laser pulse just vaporize the gold coating which in turn
compresses and heats the pellet?
Brent
On 12/15/2022 7:41 AM, John Clark wrote:
On Thu, Dec 15, 2022 at 5:17 AM Lawrence Crowell
<goldenfieldquaterni...@gmail.com> wrote:
On Thu, Dec 15, 2022 at 5:16 AM Lawrence Crowell
<goldenfieldquaterni...@gmail.com> wrote:
/> This result means the energy delivered from the laser shock
wave on a deuterium pellet was .67 the fusion energy released. It
does not take into account the much larger amounts of energy
needed to run the laser system, energy that does not make it to
the pellet. This is a breakthrough of sorts, but still quite a
ways from a practical operating fusion power station./
I agree with all that except thatmost of the Laser's energy that hits
the Fusion target does not heat the core deuterium and tritium pellet
directly, instead it heats an outer layer of a heavy metal like gold
or lead and that produces X-rays that heats the deuterium and tritium.
With this indirect method you lose a lot of efficiency but it's
necessary because the lasers are in the ultraviolet range and when UV
light hits a plasma most of the energy accelerates the electrons not
the nuclei which is what you want to fuse. Of course it doesn't take
long for the energy in the nuclei and the electrons to equalize but it
takes longer than the time window you have for fusion to occur which
is only about as long as it takes light to move 1 inch. If they could
make a laser that worked with a shorter wavelength than ultraviolet it
would improve efficiency enormously and you could get by with a much
less powerful laser.
John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>
tttu
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