Search found 129 matches

by RERT
Tue Apr 03, 2018 8:22 pm
Forum: News
Topic: Tokamak Energy news
Replies: 125
Views: 146019

Re: Tokamak Energy news

On a closing note to the above, TE reports in a brief email exchange that elongation with Kappa greater than 3 produces a very unstable plasma, and that increasing the height of the toroid at fixed major radius will increase costs.
by RERT
Fri Mar 30, 2018 9:25 pm
Forum: News
Topic: Tokamak Energy news
Replies: 125
Views: 146019

Re: Tokamak Energy news

Daniel Clery's talk was a very quick canter through most of the major competitors. NIF, TAE and GF got mentions, I don't believe Helion or Zap Energy did, but LPP did, maybe a slide or two on each. The overall impression was that this was a matter of form, to mention other approaches before complete...
by RERT
Thu Mar 29, 2018 11:15 am
Forum: News
Topic: Tokamak Energy news
Replies: 125
Views: 146019

Re: Tokamak Energy news

For completeness a few recollections of the second day of the Royal Society event. Day began with John Menard and Dennis Whyte giving pretty upbeat presentations on low-aspect ratio Tokamaks and the impact of HTS. John's talk showed a ton of data on modelling and simulation, making a tough argument ...
by RERT
Mon Mar 26, 2018 6:01 pm
Forum: News
Topic: Tokamak Energy news
Replies: 125
Views: 146019

Re: Tokamak Energy news

Oh, and of course, TE don’t accept the premise of a multi GW plant, they propose multiple smaller units sharing turbine/balance of plant.
by RERT
Mon Mar 26, 2018 6:00 pm
Forum: News
Topic: Tokamak Energy news
Replies: 125
Views: 146019

Re: Tokamak Energy news

Further to the conference first day: mostly consisted of lots of bigwigs from ITER arguing that (they weren’t stupid and) a Tokamak power plant had to be the size of ITER - about 8 m major diameter. The premise was that they needed to generate 1-2 GW electric, breed enough tritium to be self suffici...
by RERT
Mon Mar 26, 2018 5:46 pm
Forum: News
Topic: Tokamak Energy news
Replies: 125
Views: 146019

Re: Tokamak Energy news

I’ve been at the Tokamak Energy conference at the Royal Society today, and I took the chance to ask a couple of people from TE ‘Why did you stop at spherical?’. Two answers. 1) the plasmas naturally forms a ‘D’ shape as the current flows through the toroid. Constructing the coils in a ‘D’ shape mini...
by RERT
Sat Mar 17, 2018 7:25 pm
Forum: News
Topic: Tokamak Energy news
Replies: 125
Views: 146019

Re: Tokamak Energy news

Thanks for that. Apparently this feature is known as plasma 'elongation'. It seems that the question of Tokamak plasma shape has been an active field of research. Who knew... Going back to Wiki on Spherical Tokamaks, I see this in the section on plasma stability : "Using this in the critical beta fo...
by RERT
Wed Mar 14, 2018 10:38 am
Forum: News
Topic: Tokamak Energy news
Replies: 125
Views: 146019

Re: Tokamak Energy news

Tokamak Energy is investigating Spherical Tokamaks. Reading a little yesterday, I couldn't come across a reason why high aspect-ratio tokamaks stopped at spherical. Put a little more formally, one can conceive of an 'ellipsoidal' tokamak where the length of the central column is substantially greate...
by RERT
Tue Jan 16, 2018 4:40 pm
Forum: News
Topic: EMC2 news
Replies: 433
Views: 346356

Re: EMC2 news

I think the LPP offering is for the purchase of non-voting shares, a useful trick I think.
by RERT
Fri Jan 05, 2018 2:00 pm
Forum: News
Topic: Fission news(I know blasphemy )
Replies: 59
Views: 79647

Re: Fission news(I know blasphemy )

Can't argue with that. Subtract volatile renewables from volatile demand, and you get smaller demand which is more volatile. Must be bad for any base load supply which is not easy to adjust. Ironic that renewables are working against carbon-free nuclear power. You can probably work up an argument th...
by RERT
Thu Jan 04, 2018 7:53 am
Forum: News
Topic: Fission news(I know blasphemy )
Replies: 59
Views: 79647

Re: Fission news(I know blasphemy )

I think the assumption that regulation was cleared up-front is questionable. The assertion from Thorcon was that 1970s nuclear costs were lower than coal. That must mean currently many billions of costs per plant are due to regulation, which can hardly be from a careful review of plans. More likely ...
by RERT
Wed Jan 03, 2018 11:15 am
Forum: News
Topic: SpaceX News
Replies: 2289
Views: 804546

Re: SpaceX News

Not enough information. I think it depends on the relative launch costs of an F9 payload with the two platforms. Costs probably just means operating costs, as the capital cost of a launch of each is the same - a fiftieth of the cost of a BFR, if you will never replace the F9. If you always make more...
by RERT
Fri Dec 29, 2017 7:33 pm
Forum: Design
Topic: Radiation Shielding Materials Containing H, B, and N
Replies: 7
Views: 13561

Re: Radiation Shielding Materials Containing H, B, and N

I found this, seems to corroborate the above, around page 65 onwards

http://www.iaea.org/inis/collection/NCL ... 090626.pdf
by RERT
Thu Dec 28, 2017 3:53 pm
Forum: Design
Topic: Radiation Shielding Materials Containing H, B, and N
Replies: 7
Views: 13561

Re: Radiation Shielding Materials Containing H, B, and N

I've been fiddling with data from Wikipedia on p11B fusion, which suggests that the side reaction p+11B->12C+Gamma (16MeV) occurs with a 0.1 % branching probability. Given this, I think a 10MW (Th) reactor would be a source of kilowatts of 16MeV gammas, and I agree with the last post that a foot of ...
by RERT
Fri Dec 15, 2017 1:49 pm
Forum: News
Topic: laser fusion breakthrough
Replies: 3
Views: 6402

Re: laser fusion breakthrough

I asked a physics question at the LPP crowdfunding site stemming from linking to the paper from her. Eric Lerner of LPP said they had been exchanging info with this group. Also interesting to note the basic physics of the Avalanche mechanism talked about in the arxiv paper linked in the root post wo...