Talk-Polywell.org

Hopefully they will disclose some details about the idea and the road they intend to explore. Looking forward to it.

Increased field strength due to HTSC are able to resolve most of the previous issues. But is also true that those stronger magnets are also solving most of the issues in older ideas and enabling new ideas. In my opinion the race at this point is just to who will be able to offer a design at an econo...

I will never get bored of repeating that we should always beware of scaling plateau in uncharted areas. This issue has been the major stopover of virtually every fusion tech out there for the past 40 years and the main cause of the popular belief that "fusion is always 20 years in future"..... The ...

I will never get bored of repeating that we should always beware of scaling plateau in uncharted areas. This issue has been the major stopover of virtually every fusion tech out there for the past 40 years and the main cause of the popular belief that "fusion is always 20 years in future"..... The m...

So heard back from David (they are super busy with deliveries of Polaris parts) and as I understand it, for n=2 instabilities radius is what is important. Onset of rotation scales similar to particle confinement time. At least rs^2.1 if not stronger. Yes, confinement time in FRC is scaling with rs^...

There is more to stability than 'FRC Plasma'. Temperature for example is important, as plasma Temp increases so does stability. [.....] I would presume that Helion realized what worked early on. Indeed this is a possibility, even if simply increasing temperature will not inherently ensure a stable ...

Well, I am not sure to what point he is referring to, but I do not think that TAE can be considered a small IPA plasma, and they are suffering n=2 instabilities like every other FRC experiment so far. This is also the reason why they need to employ plasma guns and neutral beams to stabilize and kee...

Very brief response from David Kirtley on the short life of FRCs claimed by Giorgio: "Not sure what they are talking about. That might have been true for little IPA- sized plasmas." Trying to get some more info with hopefully some numbers for Trenta, but he has been super busy. So no promises. Well...

On the other hand, plasma compression is unproven for Zap, & they admit that their latest modeling is where their confidence lies. Also, their machine is not that expensive to build & the reason their time line for Q>1 is short (2023 as I recall, & their machine is up & running as we speak). So, I ...

Again, it might as well be that they solved the issue and didn't want to disclose it, no one knows, but the issue is real and is there from 15 years waiting to be solved as it is a roadblock for everyone working with FRCs and hoping to get to Q>1. Is this what Dennis Whyte has in mind when he says ...

Indeed I checked and you are correct, the 1 ms value was for the Trenta and they (officially) didn't reach it as confinement stopped at 0.04 ms due to the rotational instabilities as I have been saying. Reference please! Venti was the one with 0.04 ms TauE, IIRC. Trenta did significantly better, AF...

According the picture you linked Tpulse < 0.5 ms (500 us), so the 100 us that I was remembering is into that range, and anyhow anything above 40 us will require to solve the issues of the n=2 rotational instabilities. I will look anyhow for the source for your reference tomorrow . And if they are a...

That's exactly what I am saying from the start. Tilt Instabilities is not the issue, n=2 rotational instabilities are the issue. Unless you fix that you cannot have a stable field over 40 uSec. Nope the n=2 instabilities set on AFTER the tilt instabilities and the onset of those is extended to the ...

You might want to watch it again, especially starting at 6:55. The equation you want to look at for tilt instability is s*/e < 5 With the crucial point that David makes at 7:33: "this enables to build systems that have a theoretical stability limit in MHD stability the us or ns level but actually e...

Here as promised: 1) Helion news release: Quote: Fusion reaction rates and particle confinement meet or exceed traditional modified-Lower Hybrid Drift (LHD) FRC energy confinement and overall configuration time is limited as expected by the onset of n=2 rotational instability. 2) Video presentation ...