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<p>I think DT refers simply to the remaining fraction of
Deuterium/Tritium remaining after the reaction event (-4%) without
specific accounting for remaining D vs T. <br>
</p>
<p>My understanding is that D-T fusion occurs at a lower
temperature than D-D but that once fusion commences (starting with
D-T), both D-T and D-D reactions occurring in similar amounts.
In laser-driven ICF (as with NIF) I believe the ratio of D/T is
nominally 50/50 though it would seem to make sense to have a
higher T to D ratio but most references I see imply equal
portions. An equal number of D-D and D-T reactions would seem to
consume D more quickly, though as that commences, the D/T ratio
would go down, making D-T reactions (yet) more likely... tricky
business, no wonder it has taken decades to get to this point?</p>
<p>The Wikipedia Entry on ICF is pretty good: <a
moz-do-not-send="true"
href="https://en.wikipedia.org/wiki/Inertial_confinement_fusion"
class="moz-txt-link-freetext">https://en.wikipedia.org/wiki/Inertial_confinement_fusion</a></p>
<p>I found several popular science Articles which seem to reinforce
my sense that this "breakthrough" is not as significant as
implied:</p>
<blockquote>
<p><a moz-do-not-send="true"
href="https://www.science.org/content/article/fusion-breakthrough-nif-uh-not-really"
class="moz-txt-link-freetext">https://www.science.org/content/article/fusion-breakthrough-nif-uh-not-really</a><br>
</p>
</blockquote>
<p>Other interesting/relevant links regarding D-T and D-D fusion...<br>
</p>
<p><a moz-do-not-send="true"
href="https://www.researchgate.net/publication/263507001_Species_separation_and_modification_of_neutron_diagnostics_in_inertial-confinement_fusion/figures?lo=1"
class="moz-txt-link-freetext">https://www.researchgate.net/publication/263507001_Species_separation_and_modification_of_neutron_diagnostics_in_inertial-confinement_fusion/figures?lo=1</a><br>
</p>
<p><a moz-do-not-send="true"
href="https://www.energy.gov/science/doe-explainsnuclear-fusion-reactions">
https://www.energy.gov/science/doe-explainsnuclear-fusion-reactions</a></p>
<p><a moz-do-not-send="true"
href="https://science.jrank.org/pages/4732/Nuclear-Fusion-D-D-D-T-reactions.html">
https://science.jrank.org/pages/4732/Nuclear-Fusion-D-D-D-T-reactions.html</a><br>
</p>
<div class="moz-cite-prefix">On 12/13/22 4:36 PM, glen wrote:<br>
</div>
<blockquote type="cite"
cite="mid:e1fb1e2d-de67-68b7-4237-10f1f4c9a4d2@gmail.com">That's
why I asked. I guess I'll assume DT means both deuterium and
tritium, not just deuterium. If you were going to track fuel use,
you'd track the rarer part more closely, right?
<br>
<br>
On 12/13/22 09:22, Frank Wimberly wrote:
<br>
<blockquote type="cite">DT = deuterium?
<br>
<br>
---
<br>
Frank C. Wimberly
<br>
140 Calle Ojo Feliz,
<br>
Santa Fe, NM 87505
<br>
<br>
505 670-9918
<br>
Santa Fe, NM
<br>
<br>
On Tue, Dec 13, 2022, 10:21 AM glen <<a class="moz-txt-link-abbreviated" href="mailto:gepropella@gmail.com">gepropella@gmail.com</a>
<a class="moz-txt-link-rfc2396E" href="mailto:gepropella@gmail.com"><mailto:gepropella@gmail.com></a>> wrote:
<br>
<br>
Awesome. Thanks. I'm still trying to catch up with the QC
Wormhole kerfuffle. Who knew Quanta was so click baity?
<br>
<br>
What is "DT"?
<br>
<br>
On 12/13/22 09:02, Marcus Daniels wrote:
<br>
> In case no one wanted to get up at 7:00am to watch DOE
administrators talk:
<br>
>
<br>
>
<br>
> 1. Controlling the laser in space and time was
important for maintaining symmetry. Timing precision of 25e-12
secs and laser spatial precision of 5e-12 meter were needed.
This was thought to be the main explanation for the achievement.
<br>
>
<br>
> 2. 8% more power on the laser this time
<br>
>
<br>
> 3. x-ray tomography is used to find flaws in the
capsules. Developing software to do the counting.
<br>
>
<br>
> 4. They have ongoing efforts to study the fabrication
systems and their components (done in Germany) to find
idiosyncrasies of each.
<br>
>
<br>
> 5. Laser technology improvements since NIF was built
which are 20% more efficient.
<br>
>
<br>
> 6. Target cost is from labor, and it takes 7 months
each
<br>
>
<br>
> 7. 4% of DT is burned in a shot
<br>
>
<br>
> 8. Machine learning ties together radiation
hydrodynamics and experimental data. (It sounded preliminary.)
<br>
>
<br>
> 9. The (successful) capsule had more defects than
previous experiments. However, previous experiments did show
benefits from capsule quality.
<br>
>
<br>
> 10. 15% of experiments are indirect drive of this
kind, 15% of experiments are other approaches to ignition. The
rest are weapons and materials characterization.
<br>
>
<br>
> 11. Anomalous laser directional control were problems
in the summer runs. Fixed that.
<br>
</blockquote>
<br>
<br>
</blockquote>
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