Re: About the Colliding Beam Fusion Reaction
- From: lambda0@xxxxxxxxxxxx
- Date: 19 Aug 2005 08:19:49 -0700
Pedro Miguel Carvalho wrote:
> lambda0@xxxxxxxxxxxx wrote:
> >I am studying some articles about a concept of fusion reactor based
> >on
> >(...)
> >Some physicists claimed that this configuration could not produce a
> >gain greater than 1, but Rostoker answered to this argument by
> >showing
> >that standard models used for thermal plasmas are not valid for the
> >CBFR, and that a CBFR should have a gain from about 30 for D-T fusion
> >to 2-3 for p-B11.
> >
> >Does anyone has studied this device?
>
> Only theory.
>
> >Or even heard about CBFR?
>
> Yes. I have read about this a few years ago.
>
> >Any idea about the validity of this concept?
>
> From what I remember, the main problem is efficiency. The
> cross-section for the fusion reaction is small and lots of energy is
> wasted accelerating particles (p,D,T) that will never react and
> produce energy. If they react the generated MeV are unable to
> compensate this waste.
>
> Maybe with the fine-tuning of the beams energy the cross-section
> could be high enough to make the energy gain usable but I doubt it.
>
> >A link to the lab working on the CBFR :
> >http://fusion.ps.uci.edu/beam/introb.html
>
> Regards,
> Pedro Miguel Carvalho
Thank you for those informations !
Just a last remark : I found a recent thesis about the CBFR and the
argument to show that the cross-section will be higher than what is
expected from standard models is that MHD formulas do not apply to
describe correctly this kind of reactor, because the Larmor radius of
the ions is not small compared to the dimensions of the reactor. It
seems to be a general (and attractive !) feature of FRC configurations.
Tokamak is also now more efficient because it is an older solution, and
most of budgets have been invested on this solution, no ?
In fact, I try to understand the difference of strategy on the research
on fusion between Europe and US : it seems that many people are working
on alternate concept in the US (FRC, CBFR, IEC,...), but in Europe, all
budgets are concentrated on the tokamak ITER.
It's difficult to see who has the right strategy.
Thank you for your time.
.
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