Search found 82 matches

by dnavas
Tue Mar 20, 2018 9:50 pm
Forum: News
Topic: Apollo Fusion
Replies: 3
Views: 2462

Re: Apollo Fusion

I worked for Mike in an earlier startup. As far as I know, they're 12 people working on an ion thruster. I haven't heard anything from him recently on the fusion front, sadly.
by dnavas
Thu Jan 18, 2018 7:20 pm
Forum: News
Topic: EMC2 news
Replies: 331
Views: 64547

Re: EMC2 news

The short of the long of it; Is it certain? No. "we demand rigidly defined areas of doubt and uncertainty!" :sigh: I suppose it looks like movement internally, but from the outside, I feel like I've heard that simplification before.... Nevertheless, I applaud you making it out before Heav...
by dnavas
Tue Jan 02, 2018 2:22 pm
Forum: News
Topic: SpaceX News
Replies: 2113
Views: 254057

Re: SpaceX News

SpaceX BFR construction will start in 4 to 6 months It is my understanding that the ship will be built and tested prior to the booster. There are a number of design choices that concern me about the orbital vessel. The relatively large surface area will put it at higher risk for orbital debris hits...
by dnavas
Fri Nov 03, 2017 7:24 pm
Forum: News
Topic: EMC2 news
Replies: 331
Views: 64547

Re: EMC2 news

I have my suspicions. The bremsstrahlung losses might be smaller by a factor. (very wishful thinking) but given most conventional thinking in a open cusp polywell they would be about 30 percent even cutting loses in half would be outstanding. I suspect that the larger size and lower well has to do ...
by dnavas
Fri Nov 03, 2017 1:26 pm
Forum: News
Topic: EMC2 news
Replies: 331
Views: 64547

Re: EMC2 news

I thought the PowerPoint they published in August was very revealing. [...] For those to you may have missed it. https://arpa-e.energy.gov/sites/default/files/5_PARK.pdf Yeah, I found some slides in need of labels (because I don't remember all the details), so I'm cross-referencing to: https://iec....
by dnavas
Thu Nov 02, 2017 2:26 am
Forum: News
Topic: EMC2 news
Replies: 331
Views: 64547

Re: EMC2 news

Excellent news! Are the models running D/T fuel or P/B11? [Apologies if I missed this :( ] I assume the former, if they're aiming for "neutrons, medical isotopes" but I would think that there were many steps between scaling verification and handling the rest of the engineering challenges o...
by dnavas
Thu Jun 12, 2014 12:40 am
Forum: News
Topic: EMC2 has published a polywell preprint on arXiv
Replies: 145
Views: 41467

Re: EMC2 has published a polywell preprint on arXiv

But, what is the average speed over the electrons travel across the machine? ... For the mean to equal the average there can be no bias in the acceleration. But there is a bias. Indeed. I'm not even sure I know what the interior looks like, nm I don't have the math to talk sensibly about what that ...
by dnavas
Tue Jun 10, 2014 7:58 pm
Forum: News
Topic: EMC2 has published a polywell preprint on arXiv
Replies: 145
Views: 41467

Re: EMC2 has published a polywell preprint on arXiv

The KE of the electrons of somewhere between 2 and 7 KeV implies speed of eg: 5,000,000 M/s [....] I get 50,000,000 m/s for a 7 keV electron. Yeah, that agrees with my simple math as well: v = sqrt(KE * 2 / m) v = sqrt(7kev * 1e3ev/kev * 1.6e-19j/ev * 2 / 9.11e-31kg) = 50e6m/s but then the electron...
by dnavas
Mon Jun 09, 2014 1:16 pm
Forum: News
Topic: EMC2 has published a polywell preprint on arXiv
Replies: 145
Views: 41467

Re: EMC2 has published a polywell preprint on arXiv

If I'm viewing the videos correctly, it looks like highest losses are out of the faces, and I thought recirculation was less certain for such losses? Recirculation should not care which cusp the electrons escape through. I'm sure I'm missing about six years of evolution in understanding here, but s...
by dnavas
Sun Jun 08, 2014 4:59 pm
Forum: News
Topic: EMC2 has published a polywell preprint on arXiv
Replies: 145
Views: 41467

Re: EMC2 has published a polywell preprint on arXiv

Note that this performance / breakeven is ~ 10 times worse than projected for WB100. What is different? That is hard to say as no numbers were provided about confinement, recirculation, confluence, etc. The way I read it, there was no recirculation. Lifetime of 300 bounce confinement, and the profu...
by dnavas
Thu Sep 19, 2013 8:21 pm
Forum: News
Topic: Li-ion battery with ~3X specific energy (Wh/kg) increase
Replies: 11
Views: 2323

Re: Li-ion battery with ~3X specific energy (Wh/kg) increase

Looks like the trick is going to be good cycling.
[They seem pretty convinced that their electrolyte will work.]
by dnavas
Tue May 28, 2013 7:38 pm
Forum: News
Topic: Recovery.Gov Project Tracker
Replies: 1822
Views: 794330

Re: Recovery.Gov Project Tracker

paperburn1 wrote:Dollar by dollar maintenance funding continues.....


My fear is that this is a fate worse than death.
Not enough money to actually accomplish anything, just enough money to keep mouths shut.
by dnavas
Wed Apr 24, 2013 3:22 pm
Forum: News
Topic: Improved Battery Technology (finally?)
Replies: 3
Views: 2308

Re: Improved Battery Technology (finally?)

Interesting. Seems like they have a cycling problem at the moment, but it looks worth further research. Thanks for the link.
by dnavas
Thu Feb 14, 2013 6:34 pm
Forum: General
Topic: fansworth working on his fusor again....
Replies: 40
Views: 5332

Re: fansworth working on his fusor again....

...if anything i was hoping for someone to present evidence to the contrary. e.g. show something innovative that the kid did w/the polywel design that showed a deep understanding of the math and physics behind it. Your statement encompasses the entirety of science. Did it? I surely didn't take it t...
by dnavas
Wed Feb 13, 2013 2:27 pm
Forum: General
Topic: fansworth working on his fusor again....
Replies: 40
Views: 5332

Re: Re:

Funny that the original Farnsworth was a Mormon IIRC. Guess he was IQ impeded as well according to happyjack and didn't have the "mind for it" to develop anything successfully. Ah well. are you really that frickin' thick?!? do you really not understand the basic concept of probability? Yo...

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